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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JWT Analyzer & Tester</title>
<style>
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Syne:wght@400;600;700;800&display=swap');
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--bg:#0b0d11;--bg2:#0f1115;--bg3:#181b21;--bg4:#1e2128;--bg5:#252830;
--border:rgba(255,255,255,0.07);--border2:rgba(255,255,255,0.13);
--text:#e2e4ea;--text2:#7c8096;--text3:#4d5068;
--accent:#6c6fff;--accent2:#8b8dff;
--green:#22c55e;--red:#ef4444;--amber:#f59e0b;--cyan:#22d3ee;--purple:#a78bfa;
--mono:'JetBrains Mono',monospace;--sans:'Syne',sans-serif;
}
body{background:var(--bg);color:var(--text);font-family:var(--sans);min-height:100vh}
.header{background:#0d0f14;border-bottom:1px solid var(--border);padding:16px 26px;display:flex;align-items:center;gap:13px}
.logo{width:36px;height:36px;background:linear-gradient(135deg,var(--accent),#4a4ccc);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:17px;flex-shrink:0}
.htitle{font-size:18px;font-weight:800;background:linear-gradient(90deg,#fff,var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hsub{font-size:10.5px;color:var(--text3);margin-top:1px}
.hbadges{margin-left:auto;display:flex;gap:5px;flex-wrap:wrap}
.hb{font-size:10px;font-weight:600;padding:3px 8px;border-radius:20px;font-family:var(--mono)}
.hb-blue{background:rgba(59,130,246,0.12);border:1px solid rgba(59,130,246,0.25);color:#60a5fa}
.hb-green{background:rgba(34,197,94,0.1);border:1px solid rgba(34,197,94,0.2);color:#4ade80}
.hb-amber{background:rgba(245,158,11,0.1);border:1px solid rgba(245,158,11,0.2);color:#fbbf24}
.nav{display:flex;gap:2px;padding:10px 26px 0;background:#0d0f14;border-bottom:1px solid var(--border)}
.nt{font-size:11.5px;font-weight:600;padding:6px 14px;border-radius:8px 8px 0 0;cursor:pointer;border:1px solid transparent;border-bottom:none;background:transparent;color:var(--text3);font-family:var(--sans);transition:all .15s;position:relative;top:1px}
.nt.active{background:var(--bg);color:var(--text);border-color:var(--border);border-bottom-color:var(--bg)}
.nt:hover:not(.active){color:var(--text2)}
.view{display:none}.view.active{display:block}
.two-col{display:grid;grid-template-columns:1fr 1fr;min-height:calc(100vh - 108px)}
.panel{padding:20px 24px;border-right:1px solid var(--border);overflow-y:auto}
.panel:last-child{border-right:none}
.plabel{font-size:10px;font-weight:600;letter-spacing:1.2px;text-transform:uppercase;color:var(--text3);margin-bottom:11px;display:flex;align-items:center;gap:6px}
.plabel::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--accent);display:inline-block}
.ta{width:100%;background:var(--bg3);border:1px solid var(--border);border-radius:9px;color:var(--text);font-family:var(--mono);font-size:11.5px;line-height:1.7;padding:11px 13px;resize:vertical;min-height:85px;transition:border-color .2s;outline:none}
.ta:focus{border-color:var(--accent)}
.ta::placeholder{color:var(--text3)}
.inp{background:var(--bg3);border:1px solid var(--border);border-radius:7px;color:var(--text);font-family:var(--mono);font-size:11.5px;padding:6px 10px;outline:none;transition:border-color .2s;width:100%}
.inp:focus{border-color:var(--accent)}
.inp::placeholder{color:var(--text3)}
select.inp{cursor:pointer}
.brow{display:flex;gap:6px;margin-top:9px;flex-wrap:wrap}
.btn{font-family:var(--sans);font-size:11px;font-weight:600;padding:6px 13px;border-radius:7px;border:1px solid var(--border2);background:var(--bg3);color:var(--text);cursor:pointer;transition:all .15s;display:flex;align-items:center;gap:5px}
.btn:hover{background:var(--bg4);border-color:var(--accent);color:var(--accent2)}
.btnp{background:var(--accent);border-color:var(--accent);color:#fff}
.btnp:hover{background:var(--accent2);border-color:var(--accent2);color:#fff}
.btnd{background:rgba(239,68,68,0.1);border-color:rgba(239,68,68,0.3);color:var(--red)}
.btnd:hover{background:rgba(239,68,68,0.2)}
.btng{background:rgba(34,197,94,0.1);border-color:rgba(34,197,94,0.3);color:var(--green)}
.btng:hover{background:rgba(34,197,94,0.2)}
.btn-sm{font-size:10px;padding:3px 8px}
.tc{background:var(--bg3);border:1px solid var(--border);border-radius:9px;padding:11px 13px;font-family:var(--mono);font-size:11.5px;line-height:1.8;word-break:break-all;min-height:48px}
.jh{color:#f87171}.jp{color:#fb923c}.js{color:#a78bfa}.jdot{color:var(--text3)}
.dblock{background:var(--bg3);border:1px solid var(--border);border-radius:9px;overflow:hidden;margin-bottom:8px}
.dbhdr{padding:7px 12px;font-size:10px;font-weight:600;letter-spacing:.8px;text-transform:uppercase;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}
.lh{color:#f87171}.lp{color:#fb923c}.ls{color:#a78bfa}
.dbbody{padding:10px 12px;font-family:var(--mono);font-size:11px;line-height:1.85;white-space:pre-wrap;word-break:break-all}
.jk{color:#93c5fd}.jstr{color:#86efac}.jnum{color:#fcd34d}.jbool{color:var(--purple)}.jnull{color:var(--text3)}
.tsgrid{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}
.tscard{background:var(--bg4);border:1px solid var(--border);border-radius:7px;padding:8px 11px}
.tslabel{font-size:9.5px;color:var(--text3);font-weight:600;letter-spacing:.5px;text-transform:uppercase;margin-bottom:2px}
.tsval{font-size:11px;font-family:var(--mono);color:var(--text)}
.tshuman{font-size:10px;color:var(--text2);margin-top:1px}
.tscd{font-size:10.5px;font-weight:600;margin-top:2px;font-family:var(--mono)}
.cd-exp{color:var(--red)}.cd-soon{color:var(--amber)}.cd-ok{color:var(--green)}
.finding{display:flex;gap:9px;padding:8px 11px;border-radius:7px;margin-bottom:5px;border:1px solid transparent}
.f-c{background:rgba(239,68,68,0.08);border-color:rgba(239,68,68,0.22)}
.f-w{background:rgba(245,158,11,0.08);border-color:rgba(245,158,11,0.22)}
.f-i{background:rgba(34,211,238,0.06);border-color:rgba(34,211,238,0.15)}
.f-o{background:rgba(34,197,94,0.06);border-color:rgba(34,197,94,0.15)}
.ficon{font-size:12px;flex-shrink:0;margin-top:1px}
.ftitle{font-size:12px;font-weight:600;margin-bottom:2px}
.f-c .ftitle{color:var(--red)}.f-w .ftitle{color:var(--amber)}.f-i .ftitle{color:var(--cyan)}.f-o .ftitle{color:var(--green)}
.fdesc{font-size:11px;color:var(--text2);line-height:1.5}
.swrap{display:flex;align-items:center;gap:14px;padding:12px 14px;background:var(--bg3);border:1px solid var(--border);border-radius:9px;margin-bottom:11px}
.ring-outer{position:relative;width:52px;height:52px;flex-shrink:0}
.ring-outer svg{transform:rotate(-90deg)}
.rbg{fill:none;stroke:var(--bg4);stroke-width:5}
.rfill{fill:none;stroke-width:5;stroke-linecap:round;transition:stroke-dashoffset .8s cubic-bezier(.4,0,.2,1),stroke .3s}
.rlabel{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:600}
.stext h3{font-size:14px;font-weight:700}
.stext p{font-size:10.5px;color:var(--text2);margin-top:2px}
.fixblock{background:var(--bg3);border:1px solid var(--border);border-radius:9px;overflow:hidden;margin-top:9px}
.fixhdr{padding:8px 12px;font-size:10px;font-weight:600;letter-spacing:.8px;text-transform:uppercase;color:var(--text2);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.fixcode{padding:12px 14px;font-family:var(--mono);font-size:10.5px;line-height:1.9;color:#c4cfde;white-space:pre;overflow-x:auto}
.pk{color:#c792ea}.ps{color:#c3e88d}.pc{color:#546e7a;font-style:italic}.pb{color:#82aaff}.pf{color:#82aaff}.pv{color:#f07178}.pn{color:#f78c6c}
.bsec{background:var(--bg3);border:1px solid rgba(245,158,11,0.2);border-radius:9px;overflow:hidden;margin-top:14px}
.bhdr{padding:8px 12px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.btitle{font-size:10px;font-weight:600;letter-spacing:.8px;text-transform:uppercase;color:var(--amber)}
.bbody{padding:12px}
.bpwrap{height:4px;background:var(--bg4);border-radius:2px;overflow:hidden;margin:8px 0 5px}
.bpbar{height:100%;width:0;background:var(--amber);border-radius:2px;transition:width .1s linear}
.bstatus{font-size:10.5px;color:var(--text2);font-family:var(--mono);min-height:14px;margin-bottom:6px}
.bstats{display:flex;gap:10px;flex-wrap:wrap}
.bstat{font-size:10px;font-family:var(--mono);color:var(--text2)}
.bstat span{color:var(--text);font-weight:600}
.crackbox{background:rgba(239,68,68,0.1);border:1px solid rgba(239,68,68,0.3);border-radius:7px;padding:9px 12px;margin-top:7px}
.clabel{font-size:10px;color:var(--red);font-weight:600;letter-spacing:.5px;margin-bottom:3px}
.csecret{font-family:var(--mono);font-size:14px;font-weight:600;color:#fff;letter-spacing:1px}
.safebox{background:rgba(34,197,94,0.07);border:1px solid rgba(34,197,94,0.2);border-radius:7px;padding:8px 12px;margin-top:7px;font-size:11px;color:var(--green)}
.algrow{display:flex;align-items:center;gap:7px;margin-bottom:8px;font-size:11.5px;color:var(--text2);flex-wrap:wrap}
.vres{padding:8px 12px;border-radius:7px;margin-top:8px;font-size:11.5px;font-weight:600}
.vok{background:rgba(34,197,94,0.1);border:1px solid rgba(34,197,94,0.25);color:var(--green)}
.vfail{background:rgba(239,68,68,0.1);border:1px solid rgba(239,68,68,0.25);color:var(--red)}
.forgegrid{display:grid;grid-template-columns:1fr 1fr;gap:11px}
.crow{display:flex;gap:6px;align-items:center;margin-bottom:6px}
.crow .inp{flex:1}
.ckey{width:105px;flex-shrink:0}
.cdel{background:none;border:none;color:var(--text3);cursor:pointer;font-size:14px;padding:0 3px;transition:color .15s}
.cdel:hover{color:var(--red)}
.forgeout{background:var(--bg3);border:1px solid var(--border);border-radius:9px;padding:11px 13px;font-family:var(--mono);font-size:10.5px;word-break:break-all;line-height:1.7;min-height:55px;color:var(--text2)}
.histitem{background:var(--bg3);border:1px solid var(--border);border-radius:7px;padding:8px 11px;margin-bottom:6px;cursor:pointer;transition:border-color .15s,background .15s;display:flex;align-items:center;gap:9px}
.histitem:hover{border-color:var(--accent);background:var(--bg4)}
.halg{font-size:9.5px;font-weight:600;padding:2px 6px;border-radius:4px;font-family:var(--mono);flex-shrink:0}
.halg-h{background:rgba(245,158,11,0.15);color:var(--amber)}
.halg-a{background:rgba(34,197,94,0.12);color:var(--green)}
.halg-n{background:rgba(239,68,68,0.15);color:var(--red)}
.hsub{font-size:11.5px;font-weight:600;color:var(--text)}
.hprev{font-size:10px;font-family:var(--mono);color:var(--text3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:1px}
.acard{background:var(--bg3);border:1px solid var(--border);border-radius:9px;overflow:hidden;margin-bottom:9px}
.achdr{padding:8px 12px;font-size:11px;font-weight:600;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.abody{padding:10px 12px;font-size:11.5px;color:var(--text2);line-height:1.6}
.a-c{border-left:3px solid var(--red)}.a-w{border-left:3px solid var(--amber)}
.ademo{font-size:10px;padding:3px 9px;border-radius:5px;border:1px solid var(--border2);background:var(--bg4);color:var(--text);cursor:pointer;font-family:var(--sans);font-weight:600;transition:all .15s}
.ademo:hover{border-color:var(--accent);color:var(--accent2)}
.slist{display:flex;flex-direction:column;gap:5px;margin-bottom:13px}
.si{background:var(--bg3);border:1px solid var(--border);border-radius:7px;padding:7px 10px;cursor:pointer;display:flex;align-items:center;gap:8px;transition:border-color .15s,background .15s;font-size:11px}
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.bd{background:rgba(239,68,68,0.15);color:var(--red)}
.bw{background:rgba(245,158,11,0.15);color:var(--amber)}
.bo{background:rgba(34,197,94,0.15);color:var(--green)}
.sn{color:var(--text);font-weight:600}
.sd{color:var(--text3);font-size:10px;margin-top:1px}
.tag{display:inline-block;font-size:9.5px;padding:1px 5px;border-radius:3px;font-family:var(--mono);margin-right:3px}
.tr{background:rgba(239,68,68,0.15);color:var(--red)}
.ta2{background:rgba(245,158,11,0.12);color:var(--amber)}
hr.d{border:none;border-top:1px solid var(--border);margin:13px 0}
.empty{color:var(--text3);font-size:12px;text-align:center;padding:32px 16px;line-height:1.7}
.eicon{font-size:26px;margin-bottom:7px;opacity:.35}
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.toast.show{opacity:1;transform:translateY(0)}
@media(max-width:780px){.two-col{grid-template-columns:1fr}.panel{border-right:none;border-bottom:1px solid var(--border)}.header{padding:12px 14px}.forgegrid{grid-template-columns:1fr}.tsgrid{grid-template-columns:1fr}}
</style>
</head>
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<script>
window.dataLayer = window.dataLayer || [];
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gtag('js', new Date());
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<body>
<div class="header">
<div class="logo">🔐</div>
<div>
<div class="htitle">JWT Analyzer & Tester</div>
<div class="hsub">Decode · Audit · Brute-Force · Forge · Attack Simulation · History</div>
</div>
<div class="hbadges">
<div class="hb hb-blue">Python / PyJWT</div>
<div class="hb hb-green">Web Crypto API</div>
<div class="hb hb-amber">Pen-Test Ready</div>
</div>
</div>
<div class="nav">
<button class="nt active" onclick="switchTab('analyze',this)">🔍 Analyze</button>
<button class="nt" onclick="switchTab('forge',this)">⚗️ Forge / Tamper</button>
<button class="nt" onclick="switchTab('attacks',this)">💀 Attack Sim</button>
<button class="nt" onclick="switchTab('history',this)">📜 History</button>
</div>
<!-- ══ ANALYZE ══ -->
<div id="view-analyze" class="view active">
<div class="two-col">
<div class="panel">
<div class="plabel">Sample Tokens</div>
<div class="slist">
<div class="si" onclick="loadSample('none')"><div class="sb bd">CRITICAL</div><div><div class="sn">alg:none Bypass</div><div class="sd">Algorithm "none" — skips signature check entirely</div></div></div>
<div class="si" onclick="loadSample('weak')"><div class="sb bd">CRITICAL</div><div><div class="sn">Weak HS256 Secret ("secret")</div><div class="sd">Top-1 in every brute-force wordlist</div></div></div>
<div class="si" onclick="loadSample('sensitive')"><div class="sb bd">CRITICAL</div><div><div class="sn">Sensitive Data in Payload</div><div class="sd">Password + credit card stored in plaintext</div></div></div>
<div class="si" onclick="loadSample('kid')"><div class="sb bd">CRITICAL</div><div><div class="sn">kid Injection Attack</div><div class="sd">SQL injection in key ID header</div></div></div>
<div class="si" onclick="loadSample('expired')"><div class="sb bw">WARNING</div><div><div class="sn">Expired + Minimal Claims</div><div class="sd">No iss/aud/jti, expired token</div></div></div>
<div class="si" onclick="loadSample('good')"><div class="sb bo">GOOD</div><div><div class="sn">Well-formed RS256</div><div class="sd">Asymmetric, all claims, 15-min expiry</div></div></div>
</div>
<div class="plabel">Paste JWT</div>
<textarea class="ta" id="tokenInput" placeholder="eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9…" rows="4" oninput="liveUpdate()"></textarea>
<div class="brow">
<button class="btn btnp" onclick="doAnalyze()">⚡ Analyze</button>
<button class="btn" onclick="clearAll()">✕ Clear</button>
<button class="btn" onclick="copyFix()">⎘ Python Fix</button>
<button class="btn" onclick="exportReport()">↓ Export JSON</button>
</div>
<hr class="d">
<div class="plabel">Token Structure</div>
<div class="tc" id="tokenColored"><span style="color:var(--text3);font-family:var(--mono);font-size:11px">Paste a token above…</span></div>
<hr class="d">
<div class="plabel">Decoded Claims</div>
<div id="decodeSection"><div class="empty"><div class="eicon">🔍</div>Header · Payload · Signature appear here</div></div>
<hr class="d">
<div class="plabel">Verify Signature (HMAC)</div>
<div style="display:flex;gap:6px;align-items:center">
<input class="inp" id="verifySecret" placeholder="Known secret to verify…" style="flex:1">
<select class="inp" id="verifyAlg" style="width:85px"><option>HS256</option><option>HS384</option><option>HS512</option></select>
<button class="btn btng btn-sm" onclick="verifySignature()">✓ Verify</button>
</div>
<div id="verifyResult"></div>
</div>
<div class="panel" id="rightPanel">
<div class="plabel">Security Findings</div>
<div id="analysisContainer"><div class="empty"><div class="eicon">🛡️</div>Analyze a token to see findings,<br>score, timestamps and Python fix</div></div>
<div class="bsec" id="bruteSection" style="display:none">
<div class="bhdr">
<div class="btitle">🔨 Wordlist Secret Brute-Force</div>
<button class="btn btn-sm" id="bruteBtn" onclick="toggleBrute()">▶ Run</button>
</div>
<div class="bbody">
<div class="algrow">
<span>Alg:</span>
<select class="inp" id="bruteAlg" style="width:82px"><option>HS256</option><option>HS384</option><option>HS512</option></select>
<span>Wordlist:</span>
<select class="inp" id="wordlistSel" onchange="onWLChange()" style="width:150px">
<option value="top100">Top 100 common secrets</option>
<option value="top500">Top 500 expanded</option>
<option value="custom">Custom list</option>
</select>
<span id="wlLabel" style="color:var(--text3);font-family:var(--mono);font-size:10px">100 words</span>
</div>
<textarea class="ta" id="customWords" placeholder="One word per line…" style="display:none;min-height:65px;margin-bottom:7px" oninput="updateWLCount()"></textarea>
<div class="bpwrap"><div class="bpbar" id="bpbar"></div></div>
<div class="bstatus" id="bstatus">Ready — click ▶ Run to start</div>
<div class="bstats">
<div class="bstat">Tested: <span id="sTested">0</span></div>
<div class="bstat">Speed: <span id="sSpeed">—</span>/s</div>
<div class="bstat">Elapsed: <span id="sTime">0.0s</span></div>
<div class="bstat">Left: <span id="sLeft">—</span></div>
</div>
<div id="bruteResult"></div>
</div>
</div>
</div>
</div>
</div>
<!-- ══ FORGE ══ -->
<div id="view-forge" class="view">
<div class="two-col">
<div class="panel">
<div class="plabel">Header Claims</div>
<div id="forgeHClaims"></div>
<button class="btn btn-sm" onclick="addClaim('h')" style="margin-bottom:13px">+ Add Header Claim</button>
<div class="plabel">Payload Claims</div>
<div id="forgePClaims"></div>
<button class="btn btn-sm" onclick="addClaim('p')">+ Add Payload Claim</button>
<hr class="d">
<div class="plabel">Sign With (HMAC)</div>
<div style="display:flex;gap:6px;align-items:center">
<input class="inp" id="forgeSecret" placeholder="Secret (blank = unsigned)" style="flex:1">
<select class="inp" id="forgeAlg" style="width:85px"><option>HS256</option><option>HS384</option><option>HS512</option><option value="none">none</option></select>
</div>
<div class="brow" style="margin-top:9px">
<button class="btn btnp" onclick="forgeToken()">⚗️ Generate Token</button>
<button class="btn" onclick="resetForge()">↺ Reset</button>
<button class="btn btn-sm" onclick="loadForgeFromAnalysis()">← Load Current</button>
</div>
<hr class="d">
<div class="plabel">Quick Presets</div>
<div style="display:flex;flex-wrap:wrap;gap:5px">
<button class="btn btn-sm" onclick="applyPreset('admin')">Admin Escalation</button>
<button class="btn btn-sm" onclick="applyPreset('longexp')">30-day Expiry</button>
<button class="btn btn-sm" onclick="applyPreset('noexp')">No Expiry</button>
<button class="btn btn-sm" onclick="applyPreset('algnone')">alg:none</button>
<button class="btn btn-sm" onclick="applyPreset('minimal')">Minimal</button>
<button class="btn btn-sm" onclick="applyPreset('rs256hdr')">RS256 Header</button>
</div>
</div>
<div class="panel">
<div class="plabel">Generated Token</div>
<div class="forgeout" id="forgeOut">Token appears here after generation…</div>
<div class="brow" style="margin-top:7px">
<button class="btn btn-sm" onclick="copyForged()">⎘ Copy Token</button>
<button class="btn btn-sm" onclick="sendForgedToAnalyzer()">→ Send to Analyzer</button>
</div>
<hr class="d">
<div class="plabel">Preview</div>
<div id="forgePreview"><div class="empty"><div class="eicon">⚗️</div>Generate a token to preview it</div></div>
</div>
</div>
</div>
<!-- ══ ATTACKS ══ -->
<div id="view-attacks" class="view">
<div class="two-col">
<div class="panel">
<div class="plabel">Known JWT Attack Vectors</div>
<div class="acard a-c">
<div class="achdr"><span><span class="tag tr">CRITICAL</span> alg:none Signature Bypass</span><button class="ademo" onclick="demoAttack('none')">Demo →</button></div>
<div class="abody">Set <code style="color:var(--cyan);font-family:var(--mono)">alg:"none"</code> — vulnerable libraries skip verification entirely. Attacker can forge any payload including privilege escalation. CVE pattern: <code style="color:var(--amber);font-family:var(--mono)">jwt.decode(token, options={"verify_signature":False})</code></div>
</div>
<div class="acard a-c">
<div class="achdr"><span><span class="tag tr">CRITICAL</span> Algorithm Confusion (RS256→HS256)</span><button class="ademo" onclick="demoAttack('algconfusion')">Demo →</button></div>
<div class="abody">If a server accepts both RS256 and HS256, attacker uses the <b style="color:var(--text)">public key</b> (which is public!) as the HMAC secret. Server verifies with public key — it matches. Fix: never list both in one <code style="color:var(--amber);font-family:var(--mono)">algorithms=[]</code> allowlist.</div>
</div>
<div class="acard a-c">
<div class="achdr"><span><span class="tag tr">CRITICAL</span> kid Header Injection</span><button class="ademo" onclick="demoAttack('kid')">Demo →</button></div>
<div class="abody"><code style="color:var(--cyan);font-family:var(--mono)">kid: "../../dev/null"</code> → empty key → trivial sign<br><code style="color:var(--cyan);font-family:var(--mono)">kid: "x' UNION SELECT 'secret'--"</code> → SQL injection<br>Validate kid strictly: <code style="color:var(--amber);font-family:var(--mono)">re.match(r'^[a-zA-Z0-9\-_]{1,64}$', kid)</code></div>
</div>
<div class="acard a-w">
<div class="achdr"><span><span class="tag ta2">WARNING</span> Weak Secret Brute-Force</span><button class="ademo" onclick="demoAttack('bruteforce')">Demo →</button></div>
<div class="abody">Anyone with a JWT can run offline brute-force. hashcat tests billions/sec. Common secrets crack in milliseconds. The demo token uses <code style="color:var(--red);font-family:var(--mono)">"secret"</code> — send to Analyzer to crack it instantly.</div>
</div>
<div class="acard a-w">
<div class="achdr"><span><span class="tag ta2">WARNING</span> Replay Attack (no jti / no exp)</span><button class="ademo" onclick="demoAttack('replay')">Demo →</button></div>
<div class="abody">Without <code style="color:var(--cyan);font-family:var(--mono)">jti</code> + server denylist, stolen tokens are valid until expiry. Even after logout. Fix: jti on every token + Redis denylist on logout.</div>
</div>
<div class="acard a-w">
<div class="achdr"><span><span class="tag ta2">WARNING</span> Privilege Escalation via Payload Tampering</span><button class="ademo" onclick="demoAttack('privesc')">Demo →</button></div>
<div class="abody">If signature verification is skipped or misconfigured, Base64-decode payload, change <code style="color:var(--amber);font-family:var(--mono)">role:"user"</code>→<code style="color:var(--red);font-family:var(--mono)">role:"admin"</code>, re-encode and submit. Never trust payload claims without verifying the signature.</div>
</div>
</div>
<div class="panel">
<div class="plabel">Attack Demo Output</div>
<div id="attackOut"><div class="empty"><div class="eicon">💀</div>Click "Demo →" to generate an attack token</div></div>
<hr class="d">
<div class="plabel">Python Defence Template</div>
<div class="fixblock">
<div class="fixhdr"><span>🐍 Secure PyJWT Validation</span></div>
<div class="fixcode"><span class="pk">import</span> <span class="pb">jwt</span>, <span class="pb">re</span>
<span class="pk">from</span> <span class="pb">jwt.exceptions</span> <span class="pk">import</span> DecodeError, ExpiredSignatureError
<span class="pc"># NEVER disable verification:</span>
<span class="pc"># jwt.decode(token, options={"verify_signature": False}) ← BAD</span>
<span class="pk">def</span> <span class="pf">safe_decode</span>(token: str) -> dict:
<span class="pk">return</span> jwt.<span class="pf">decode</span>(
token,
public_key_or_secret,
algorithms=[<span class="ps">"RS256"</span>], <span class="pc"># exact list — never wildcard</span>
audience=<span class="ps">"myapp-api"</span>,
issuer=<span class="ps">"https://auth.myapp.com"</span>,
options={
<span class="ps">"require"</span>: [<span class="ps">"exp"</span>,<span class="ps">"iss"</span>,<span class="ps">"aud"</span>,<span class="ps">"jti"</span>,<span class="ps">"sub"</span>],
<span class="ps">"verify_exp"</span>: <span class="pk">True</span>,
}
)
<span class="pc"># Sanitize kid BEFORE using it to look up keys:</span>
<span class="pk">def</span> <span class="pf">safe_kid</span>(kid: str) -> str:
<span class="pk">if not</span> re.<span class="pf">match</span>(<span class="ps">r'^[a-zA-Z0-9\-_]{1,64}$'</span>, kid):
<span class="pk">raise</span> ValueError(<span class="ps">"Invalid kid"</span>)
<span class="pk">return</span> kid
<span class="pc"># Denylist check (run after decode):</span>
<span class="pk">def</span> <span class="pf">check_revoked</span>(payload: dict):
<span class="pk">if</span> redis.<span class="pf">exists</span>(<span class="pf">f</span><span class="ps">"revoked:{payload['jti']}"</span>):
<span class="pk">raise</span> PermissionError(<span class="ps">"Token revoked"</span>)</div>
</div>
</div>
</div>
</div>
<!-- ══ HISTORY ══ -->
<div id="view-history" class="view">
<div style="padding:20px 24px;max-width:860px">
<div class="plabel" style="margin-bottom:12px">Analyzed Token History</div>
<div class="brow" style="margin-bottom:12px">
<button class="btn btn-sm btnd" onclick="clearHistory()">🗑 Clear History</button>
<button class="btn btn-sm" onclick="exportHistory()">↓ Export JSON</button>
</div>
<div id="historyList"><div class="empty"><div class="eicon">📜</div>Tokens you analyze appear here.<br>Click any entry to reload it.</div></div>
</div>
</div>
<div class="toast" id="toast"></div>
<script>
// ── UTILS ──
function esc(s){return String(s).replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"')}
function b64url(obj){return btoa(JSON.stringify(obj)).replace(/\+/g,'-').replace(/\//g,'_').replace(/=/g,'')}
function b64urlDecode(s){s=s.replace(/-/g,'+').replace(/_/g,'/');while(s.length%4)s+='=';try{return JSON.parse(atob(s))}catch(e){return null}}
function colorJson(o){
return JSON.stringify(o,null,2)
.replace(/"([^"]+)":/g,'<span class="jk">"$1"</span>:')
.replace(/: "([^"]*)"/g,': <span class="jstr">"$1"</span>')
.replace(/: (-?\d+(?:\.\d+)?)/g,': <span class="jnum">$1</span>')
.replace(/: (true|false)/g,': <span class="jbool">$1</span>')
.replace(/: null/g,': <span class="jnull">null</span>')
}
function fmtTs(u){if(!u)return'—';return new Date(u*1000).toUTCString().replace(' GMT','Z')}
function fmtDur(s){if(s<60)return s+'s';if(s<3600)return Math.round(s/60)+'m';if(s<86400)return Math.round(s/3600)+'h '+Math.round((s%3600)/60)+'m';return Math.round(s/86400)+'d'}
function cdHtml(exp){const d=exp-Math.floor(Date.now()/1000);if(d<0)return`<span class="tscd cd-exp">Expired ${fmtDur(-d)} ago</span>`;if(d<300)return`<span class="tscd cd-soon">Expires in ${fmtDur(d)} ⚠</span>`;return`<span class="tscd cd-ok">Expires in ${fmtDur(d)}</span>`}
function toast(msg){const t=document.getElementById('toast');t.textContent=msg;t.classList.add('show');setTimeout(()=>t.classList.remove('show'),1900)}
function download(name,data,mime){const a=document.createElement('a');a.href=URL.createObjectURL(new Blob([data],{type:mime}));a.download=name;a.click()}
function stripHtml(s){const d=document.createElement('div');d.innerHTML=s;return d.textContent||d.innerText||''}
// ── CRYPTO ──
const ALGMAP={'HS256':'SHA-256','HS384':'SHA-384','HS512':'SHA-512'};
async function hmacSign(secret,msg,alg='HS256'){
const enc=new TextEncoder();
const k=await crypto.subtle.importKey('raw',enc.encode(secret),{name:'HMAC',hash:ALGMAP[alg]||'SHA-256'},false,['sign']);
return new Uint8Array(await crypto.subtle.sign('HMAC',k,enc.encode(msg)));
}
function u8toB64url(u8){return btoa(String.fromCharCode(...u8)).replace(/\+/g,'-').replace(/\//g,'_').replace(/=/g,'')}
function bytesEq(a,b){if(!a||!b||a.length!==b.length)return false;for(let i=0;i<a.length;i++)if(a[i]!==b[i])return false;return true}
// ── STATE ──
const NOW=Math.floor(Date.now()/1000);
let curHdr=null,curPay=null,curSig='',curFindings=[],curPyFix='';
let history=[];
try{history=JSON.parse(localStorage.getItem('jwtHist')||'[]')}catch(e){}
let bruteRunning=false,bruteAbort=false,bruteSigBytes=null,bruteSignIn='';
// ── SAMPLES ──
const SAMPLES={
none: b64url({alg:'none',typ:'JWT'})+'.'+b64url({sub:'admin_001',name:'Administrator',role:'admin',iat:NOW})+'.',
weak: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsIm5hbWUiOiJKb2huIERvZSIsInJvbGUiOiJ1c2VyIiwiaWF0IjoxNzAwMDAwMDAwfQ.yUO5a0q77pP7pIFnkxX8H6Xsv5E0jZzNd9_P1x7xZPk',
sensitive: b64url({alg:'HS256',typ:'JWT'})+'.'+b64url({sub:'user_456',name:'Jane',email:'jane@example.com',password:'hunter2',credit_card:'4111-1111-1111-1111',role:'user',iat:NOW,exp:NOW+3600})+'.fakesig123',
kid: b64url({alg:'HS256',typ:'JWT',kid:"../../dev/null\"; DROP TABLE users;--"})+'.'+b64url({sub:'attacker',role:'admin',iat:NOW,exp:NOW+86400})+'.injection',
expired: b64url({alg:'HS256',typ:'JWT'})+'.'+b64url({sub:'user_789',name:'Bob',role:'moderator',iat:1690000000,exp:1690007200})+'.expiredfake',
good: b64url({alg:'RS256',typ:'JWT',kid:'key-2024-01'})+'.'+b64url({sub:'user_999',name:'Alice',role:'viewer',iss:'https://auth.myapp.com',aud:'myapp-api',iat:NOW,exp:NOW+900,nbf:NOW,jti:'jti-'+Math.random().toString(36).slice(2)})+'.RS256_SIGNATURE'
};
// ── NAV ──
function switchTab(id,btn){
document.querySelectorAll('.view').forEach(v=>v.classList.remove('active'));
document.querySelectorAll('.nt').forEach(t=>t.classList.remove('active'));
document.getElementById('view-'+id).classList.add('active');
btn.classList.add('active');
if(id==='history') renderHistory();
}
function switchTabById(id){
document.querySelectorAll('.view').forEach(v=>v.classList.remove('active'));
document.querySelectorAll('.nt').forEach(t=>t.classList.remove('active'));
document.getElementById('view-'+id).classList.add('active');
const idx={analyze:0,forge:1,attacks:2,history:3}[id];
document.querySelectorAll('.nt')[idx].classList.add('active');
}
// ── LIVE UPDATE ──
function liveUpdate(){
const raw=document.getElementById('tokenInput').value.trim();
const el=document.getElementById('tokenColored');
if(!raw){el.innerHTML='<span style="color:var(--text3);font-family:var(--mono);font-size:11px">Paste a token above…</span>';return}
const parts=raw.split('.');
el.innerHTML=parts.map((p,i)=>{
const cls=i===0?'jh':i===1?'jp':'js';
return(i>0?'<span class="jdot">.</span>':'')+`<span class="${cls}">${esc(p)}</span>`
}).join('');
}
// ── LOAD SAMPLE ──
function loadSample(k){
document.getElementById('tokenInput').value=SAMPLES[k];
liveUpdate(); doAnalyze();
}
// ── ANALYZE ──
function doAnalyze(){
const raw=document.getElementById('tokenInput').value.trim();
if(!raw) return;
const parts=raw.split('.');
if(parts.length<2){renderAnalysis(null,[{sev:'critical',title:'Invalid JWT format',desc:'A valid JWT requires 3 dot-separated Base64url parts.'}],null);return}
curHdr=b64urlDecode(parts[0]);
curPay=b64urlDecode(parts[1]);
curSig=parts[2]||'';
renderDecoded(curHdr,curPay,curSig);
curFindings=runChecks(curHdr,curPay,curSig);
const score=calcScore(curFindings);
curPyFix=buildPyFix(curHdr,curPay,curFindings);
renderAnalysis(score,curFindings,curPyFix);
const isHMAC=curHdr&&['HS256','HS384','HS512'].includes(curHdr.alg);
const bs=document.getElementById('bruteSection');
if(isHMAC&&curSig){
bs.style.display='block';
setupBrute(parts[0]+'.'+parts[1],parts[2],curHdr.alg);
} else {
bs.style.display='none';
}
saveHist(raw,curHdr,curPay,score,curFindings);
}
// ── RENDER DECODED ──
function renderDecoded(h,p,s){
const sec=document.getElementById('decodeSection');
let html='';
html+=`<div class="dblock"><div class="dbhdr"><span class="lh">● Header</span><span style="font-size:9.5px;color:var(--text3)">algorithm & type</span></div><div class="dbbody">${h?colorJson(h):'<span style="color:var(--text3)">Could not decode</span>'}</div></div>`;
let tsHtml='';
if(p&&(p.iat||p.exp||p.nbf)){
tsHtml='<div class="tsgrid">';
if(p.iat) tsHtml+=`<div class="tscard"><div class="tslabel">Issued At (iat)</div><div class="tsval">${p.iat}</div><div class="tshuman">${fmtTs(p.iat)}</div></div>`;
if(p.exp) tsHtml+=`<div class="tscard"><div class="tslabel">Expires (exp)</div><div class="tsval">${p.exp}</div><div class="tshuman">${fmtTs(p.exp)}</div>${cdHtml(p.exp)}</div>`;
if(p.nbf) tsHtml+=`<div class="tscard"><div class="tslabel">Not Before (nbf)</div><div class="tsval">${p.nbf}</div><div class="tshuman">${fmtTs(p.nbf)}</div></div>`;
tsHtml+='</div>';
}
html+=`<div class="dblock"><div class="dbhdr"><span class="lp">● Payload</span><span style="font-size:9.5px;color:var(--text3)">claims</span></div><div class="dbbody">${tsHtml}${p?colorJson(p):'<span style="color:var(--text3)">Could not decode</span>'}</div></div>`;
const sd=s||'(empty — unsigned)';
const sc=!s?'color:var(--red)':'color:var(--purple)';
html+=`<div class="dblock"><div class="dbhdr"><span class="ls">● Signature</span><span style="font-size:9.5px;color:var(--text3)">${!s?'MISSING':s.length+' chars'}</span></div><div class="dbbody" style="${sc}">${esc(sd.substring(0,90))}${sd.length>90?'…':''}</div></div>`;
sec.innerHTML=html;
}
// ── CHECKS ──
function runChecks(h,p,s){
const F=[];const n=Math.floor(Date.now()/1000);
if(!h){F.push({sev:'critical',title:'Header could not be decoded',desc:'JWT header is malformed or invalid Base64url JSON.'});return F}
const alg=(h.alg||'').toLowerCase();
// alg:none
if(alg==='none') F.push({sev:'critical',title:'alg:"none" — Signature Bypass CVE',desc:'Algorithm is "none". Vulnerable libraries skip all verification, allowing arbitrary payload forgery. A critical CVE-class vulnerability.',fix_key:'alg_none'});
// missing typ
if(!h.typ) F.push({sev:'info',title:'Missing typ header',desc:'typ should be "JWT". Omitting it can confuse token type validation in multi-format systems.'});
// weak HMAC
if(['hs256','hs384','hs512'].includes(alg)) F.push({sev:'warning',title:`${h.alg} used — shared secret risk`,desc:'HMAC uses a single shared secret. If it leaks, all tokens are compromised and offline brute-force is possible. Consider RS256/ES256 (asymmetric).',fix_key:'weak_alg'});
// strong asym
if(['rs256','rs384','rs512','es256','es384','es512','ps256','ps512'].includes(alg)) F.push({sev:'ok',title:`Strong asymmetric algorithm (${h.alg})`,desc:'Only the private key can issue tokens; verification uses the distributable public key.'});
// algorithm confusion risk
if(['rs256','rs384','rs512'].includes(alg)) F.push({sev:'warning',title:'RS256 — watch for algorithm confusion attack',desc:'If your library accepts both RS256 and HS256, an attacker can use your public key as HMAC secret to forge tokens. Use algorithms=["RS256"] exclusively.'});
// kid injection
if(h.kid!==undefined){
const kid=String(h.kid);
if(/['";\\/]/.test(kid)||kid.includes('..')||kid.length>128)
F.push({sev:'critical',title:'Suspicious kid — injection detected',desc:`kid = "${esc(kid.substring(0,60))}" contains injection-prone characters (SQL, path traversal). Validate kid with a strict regex before key lookup.`});
else F.push({sev:'ok',title:'kid header present',desc:'Key ID enables rotation. Ensure it is validated with a strict allowlist before use.'});
} else if(alg!=='none'){
F.push({sev:'info',title:'No kid (Key ID)',desc:'Without kid, key rotation requires invalidating all tokens simultaneously. Add kid for seamless rotation.'});
}
if(!p){F.push({sev:'critical',title:'Payload could not be decoded',desc:'JWT payload is malformed.'});return F}
// missing sig
if(alg!=='none'&&!s) F.push({sev:'critical',title:'Signature segment empty',desc:'Signature missing despite non-none algorithm. Verification will fail or may be silently skipped.'});
// missing exp
if(!p.exp) F.push({sev:'critical',title:'No expiration (exp) claim',desc:'Tokens without exp never expire — stolen tokens grant permanent access. Set exp ≤ 15m for access tokens.',fix_key:'no_exp'});
// expired
if(p.exp&&p.exp<n) F.push({sev:'warning',title:`Token expired ${fmtDur(n-p.exp)} ago`,desc:`exp=${p.exp} (${fmtTs(p.exp)}). If your server accepts this, expiry validation is disabled.`});
// long TTL
if(p.exp&&p.iat&&(p.exp-p.iat)>86400*30) F.push({sev:'warning',title:`Excessive TTL — ${Math.round((p.exp-p.iat)/86400)} days`,desc:'Access tokens should live ≤ 1h. Long-lived tokens multiply blast radius if stolen. Use refresh tokens.',fix_key:'long_exp'});
// nbf future
if(p.nbf&&p.nbf>n) F.push({sev:'warning',title:'nbf in future — not yet valid',desc:`Token not valid until ${fmtTs(p.nbf)}.`});
// missing iss
if(!p.iss) F.push({sev:'info',title:'No issuer (iss)',desc:'iss lets your server reject tokens not issued by your own auth service.'});
// missing aud
if(!p.aud) F.push({sev:'info',title:'No audience (aud)',desc:'aud prevents cross-service token replay — a mobile app token should not work on the admin API.'});
// missing nbf
if(!p.nbf) F.push({sev:'info',title:'No nbf (not-before)',desc:'nbf enables future-scheduled access grants and prevents immediate reuse of just-issued tokens.'});
// missing jti
if(!p.jti) F.push({sev:'info',title:'No jti (JWT ID) — replay risk',desc:'Without jti you cannot maintain a denylist. Logged-out tokens remain valid until expiry.',fix_key:'no_jti'});
// sensitive fields
const SENS=['password','passwd','pw','secret','credit_card','cc','cvv','ssn','dob','pin','private_key','api_key'];
const sens=Object.keys(p).filter(k=>SENS.some(s2=>k.toLowerCase().includes(s2)));
if(sens.length) F.push({sev:'critical',title:`Sensitive data in payload: ${sens.join(', ')}`,desc:'JWT payloads are Base64-encoded — NOT encrypted. Anyone who captures the token can read these. Remove or use JWE.'});
// role escalation warning
const rv=p.role||p.roles||p.scope||p.permissions;
if(rv&&/admin|root|superuser|sudo/i.test(JSON.stringify(rv))) F.push({sev:'warning',title:'Privilege claim present — verify enforcement',desc:`Elevated role detected (${JSON.stringify(rv)}). Re-validate against DB on every request; never trust payload claims alone.`});
// oversized payload
const psz=JSON.stringify(p).length;
if(psz>2048) F.push({sev:'warning',title:`Large payload (${psz} bytes) — DoS risk`,desc:'Oversized JWTs slow verification and can hit header size limits. Keep payloads < 512 bytes; move bulk data to DB lookup by sub.'});
// all-clear
if(p.exp&&p.iss&&p.aud&&p.jti&&p.sub) F.push({sev:'ok',title:'Core claims complete (sub, exp, iss, aud, jti)',desc:'All essential claims present. Ensure your verification code requires and validates each one.'});
return F;
}
function calcScore(F){
let s=100;
F.forEach(f=>{if(f.sev==='critical')s-=24;else if(f.sev==='warning')s-=9;else if(f.sev==='info')s-=3;else if(f.sev==='ok')s+=3});
return Math.max(0,Math.min(100,s));
}
// ── RENDER ANALYSIS ──
function renderAnalysis(score,findings,pyFix){
const c=document.getElementById('analysisContainer');
let html='';
if(score!==null){
const circ=2*Math.PI*22,dash=(score/100)*circ;
const col=score>=80?'var(--green)':score>=50?'var(--amber)':'var(--red)';
const lbl=score>=80?'Secure':score>=50?'Needs Work':'Vulnerable';
const cr=findings.filter(f=>f.sev==='critical').length,wn=findings.filter(f=>f.sev==='warning').length,inf=findings.filter(f=>f.sev==='info').length,ok=findings.filter(f=>f.sev==='ok').length;
html+=`<div class="swrap">
<div class="ring-outer">
<svg width="52" height="52" viewBox="0 0 52 52">
<circle class="rbg" cx="26" cy="26" r="22"/>
<circle class="rfill" cx="26" cy="26" r="22" stroke="${col}" stroke-dasharray="${dash.toFixed(1)} ${circ.toFixed(1)}"/>
</svg>
<div class="rlabel" style="color:${col}">${score}</div>
</div>
<div class="stext">
<h3 style="color:${col}">${lbl}</h3>
<p>${cr} critical · ${wn} warnings · ${inf} info · ${ok} ok</p>
<p style="margin-top:2px">${findings.length} checks total</p>
</div>
</div>`;
}
const icons={critical:'🔴',warning:'🟡',info:'🔵',ok:'🟢'};
findings.forEach(f=>{
html+=`<div class="finding f-${f.sev[0]}">
<div class="ficon">${icons[f.sev]||'⚪'}</div>
<div><div class="ftitle">${esc(f.title)}</div><div class="fdesc">${f.desc}</div></div>
</div>`;
});
if(pyFix) html+=`<div class="fixblock" style="margin-top:13px"><div class="fixhdr"><span>🐍 Python / PyJWT — Secure Fix</span><button class="btn btn-sm" onclick="copyFix()">⎘ Copy</button></div><div class="fixcode">${pyFix}</div></div>`;
c.innerHTML=html;
}
// ── PYTHON FIX ──
function buildPyFix(h,p,findings){
const alg=h?h.alg:'HS256';
const useAsym=!h||['none','HS256','HS384','HS512'].includes(alg);
const L=[];
L.push(`<span class="pc"># JWT Secure Fix — generated by JWT Analyzer</span>`);
L.push(`<span class="pc"># pip install PyJWT cryptography</span>`);
L.push(``);
L.push(`<span class="pk">import</span> <span class="pb">jwt</span>, <span class="pb">uuid</span>, <span class="pb">secrets</span>`);
L.push(`<span class="pk">from</span> <span class="pb">datetime</span> <span class="pk">import</span> datetime, timedelta, timezone`);
if(useAsym){
L.push(`<span class="pk">from</span> <span class="pb">cryptography.hazmat.primitives.asymmetric</span> <span class="pk">import</span> rsa`);
L.push(``);
L.push(`<span class="pc"># Generate RSA-2048 once; store in KMS/Vault</span>`);
L.push(`<span class="pv">private_key</span> = rsa.generate_private_key(public_exponent=<span class="pn">65537</span>, key_size=<span class="pn">2048</span>)`);
L.push(`<span class="pv">public_key</span> = <span class="pv">private_key</span>.public_key()`);
} else {
L.push(``);
L.push(`<span class="pc"># 256-bit cryptographically random secret</span>`);
L.push(`<span class="pv">SECRET</span> = secrets.token_hex(<span class="pn">32</span>)`);
}
L.push(``);
L.push(`<span class="pk">def</span> <span class="pf">issue_token</span>(user_id: str, role: str) -> str:`);
L.push(` <span class="pv">now</span> = datetime.now(timezone.utc)`);
L.push(` <span class="pk">return</span> jwt.encode({`);
L.push(` <span class="ps">"sub"</span>: user_id, <span class="ps">"role"</span>: role,`);
L.push(` <span class="ps">"iss"</span>: <span class="ps">"https://auth.myapp.com"</span>,`);
L.push(` <span class="ps">"aud"</span>: <span class="ps">"myapp-api"</span>,`);
L.push(` <span class="ps">"iat"</span>: now, <span class="ps">"nbf"</span>: now,`);
L.push(` <span class="ps">"exp"</span>: now + timedelta(minutes=<span class="pn">15</span>),`);
L.push(` <span class="ps">"jti"</span>: str(uuid.uuid4()),`);
L.push(` },`);
if(useAsym){
L.push(` <span class="pv">private_key</span>, algorithm=<span class="ps">"RS256"</span>,`);
L.push(` headers={<span class="ps">"kid"</span>: <span class="ps">"key-2024-01"</span>})`);
} else {
L.push(` <span class="pv">SECRET</span>, algorithm=<span class="ps">"${alg}"</span>)`);
}
L.push(``);
L.push(`<span class="pk">def</span> <span class="pf">verify_token</span>(token: str) -> dict:`);
if(useAsym){
L.push(` <span class="pk">return</span> jwt.decode(token, <span class="pv">public_key</span>,`);
L.push(` algorithms=[<span class="ps">"RS256"</span>], audience=<span class="ps">"myapp-api"</span>,`);
L.push(` issuer=<span class="ps">"https://auth.myapp.com"</span>,`);
L.push(` options={<span class="ps">"require"</span>:[<span class="ps">"exp"</span>,<span class="ps">"iss"</span>,<span class="ps">"aud"</span>,<span class="ps">"jti"</span>,<span class="ps">"sub"</span>]})`);
} else {
L.push(` <span class="pk">return</span> jwt.decode(token, <span class="pv">SECRET</span>,`);
L.push(` algorithms=[<span class="ps">"${alg}"</span>],`);
L.push(` options={<span class="ps">"require"</span>:[<span class="ps">"exp"</span>,<span class="ps">"iss"</span>,<span class="ps">"aud"</span>,<span class="ps">"jti"</span>]})`);
}
L.push(``);
L.push(`<span class="pk">def</span> <span class="pf">revoke</span>(jti: str, ttl: int): redis.setex(<span class="pf">f</span><span class="ps">"rv:{jti}"</span>, ttl, <span class="pn">1</span>)`);
L.push(`<span class="pk">def</span> <span class="pf">is_revoked</span>(jti: str) -> bool: <span class="pk">return</span> bool(redis.exists(<span class="pf">f</span><span class="ps">"rv:{jti}"</span>))`);
return L.join('\n');
}
// ── VERIFY SIG ──
async function verifySignature(){
const token=document.getElementById('tokenInput').value.trim();
const secret=document.getElementById('verifySecret').value;
const alg=document.getElementById('verifyAlg').value;
const el=document.getElementById('verifyResult');
if(!token||!secret){el.innerHTML='<div class="vres vfail">Enter both a token and a secret.</div>';return}
const parts=token.split('.');
if(parts.length!==3){el.innerHTML='<div class="vres vfail">Invalid token format.</div>';return}
const computed=await hmacSign(secret,parts[0]+'.'+parts[1],alg);
if(u8toB64url(computed)===parts[2])
el.innerHTML=`<div class="vres vok">✅ Signature VALID — secret matches (${alg})</div>`;
else
el.innerHTML=`<div class="vres vfail">❌ Signature INVALID — wrong secret or algorithm</div>`;
}
// ── BRUTE FORCE ──
const WL100=['secret','password','123456','abc123','qwerty','letmein','welcome','admin','monkey','dragon','master','superman','batman','trustno1','sunshine','princess','shadow','login','pass','test','hello','world','jwt','token','key','mykey','secretkey','jwtkey','jwttoken','jwtpassword','jwtsecret','auth','authkey','authtoken','authsecret','signing_key','signing-key','signingkey','api_key','apikey','api-key','app_secret','appsecret','client_secret','clientsecret','private','privatekey','private_key','hmac','hmackey','hmac_key','hmac_secret','changeme','changethis','default','insecure','password123','pass123','p@ssw0rd','P@ssw0rd','P@$$w0rd','admin123','Admin123','admin@123','root','rootpass','toor','1234','12345','123456789','000000','111111','qwerty123','abc','xyz','foobar','foo','bar','baz','test123','testing','dev','development','staging','production','prod','local','localhost','example','sample','demo','mypassword','myapp','webapp','nodejs','python','java','golang','secret_key','SECRET_KEY','SECRET','PASSWORD','ADMIN','your-256-bit-secret','your-secret-key','your_secret_key','HS256KEY'];
const WL500=[...WL100,...['qazwsx','zxcvbn','asdfgh','1q2w3e','1q2w3e4r','pass@word','passw0rd','p4ssw0rd','super','super_secret','supersecret','secure','security','hardcoded','hack','hacker','crackme','weak','vuln','exploit','bypass','none','algnone','nosig','unsigned','notasecret','randomkey','random','temp','temporary','testkey','devkey','devtoken','devpass','stagekey','prodkey','prodsecret','appkey','apptoken','application_secret','app_signing_key','jwt_signing_secret','TOKEN_SECRET','ACCESS_TOKEN_SECRET','REFRESH_TOKEN_SECRET','SESSION_SECRET','COOKIE_SECRET','NEXT_AUTH_SECRET','NEXTAUTH_SECRET','NUXT_AUTH_SECRET','REACT_APP_SECRET','VUE_APP_SECRET','auth0','auth0secret','firebase','firebasekey','cognito','cognitokey','okta','supabase','supabasesecret','clerk','mysql','postgres','mongodb','redis','sqlite','database','db_password','db_secret','aws','azure','gcp','github','gitlab','bitbucket','heroku','render','vercel','netlify','2023','2024','2025','2026','company','startup','corp','enterprise','service','microservice','backend','frontend','mobile','api_secret_key','api_signing_key','bearer_secret','oauth_secret','oidc_secret','csrf_secret','cookie_secret_key','encryption_key','aes_key','rsa_key','abcdef','12345678','11111111','00000000','password1','password12','qwerty1234','admin1234','root1234','sysadmin','operator','guest','guestpass','user','userpass','access','accesskey','master_key','master_secret','alpha','beta','gamma','delta','omega','sigma','red','blue','green','yellow','purple','black','white','fire','water','dog','cat','lion','tiger']];
function setupBrute(signIn,s64,alg){
bruteSignIn=signIn;
if(s64){
let s=s64.replace(/-/g,'+').replace(/_/g,'/');while(s.length%4)s+='=';
try{const b=atob(s);bruteSigBytes=new Uint8Array(b.length);for(let i=0;i<b.length;i++)bruteSigBytes[i]=b.charCodeAt(i)}catch(e){bruteSigBytes=null}
} else bruteSigBytes=null;
document.getElementById('bruteAlg').value=alg;
resetBruteUI();
}
function onWLChange(){
const v=document.getElementById('wordlistSel').value;
document.getElementById('customWords').style.display=v==='custom'?'block':'none';
if(v!=='custom') document.getElementById('wlLabel').textContent=v==='top100'?'100 words':'500 words';
else updateWLCount();
resetBruteUI();
}
function updateWLCount(){
const n=document.getElementById('customWords').value.split('\n').map(s=>s.trim()).filter(Boolean).length;
document.getElementById('wlLabel').textContent=n+' words';
}
function resetBruteUI(){
document.getElementById('bpbar').style.width='0%';
document.getElementById('bpbar').style.background='var(--amber)';
document.getElementById('bstatus').textContent='Ready — click ▶ Run to start';
document.getElementById('bruteResult').innerHTML='';
document.getElementById('sTested').textContent='0';
document.getElementById('sSpeed').textContent='—';
document.getElementById('sTime').textContent='0.0s';
document.getElementById('sLeft').textContent='—';
}
async function toggleBrute(){
if(bruteRunning){bruteAbort=true;return}
await startBrute();
}
async function startBrute(){
if(!bruteSigBytes){document.getElementById('bruteResult').innerHTML='<div class="safebox">⚠ No signature to crack.</div>';return}
const wv=document.getElementById('wordlistSel').value;
let words=wv==='custom'?document.getElementById('customWords').value.split('\n').map(s=>s.trim()).filter(Boolean):wv==='top100'?WL100:WL500;
if(!words.length){document.getElementById('bstatus').textContent='Enter words first.';return}
const alg=document.getElementById('bruteAlg').value;
bruteRunning=true;bruteAbort=false;
document.getElementById('bruteBtn').textContent='■ Stop';
document.getElementById('bruteResult').innerHTML='';
const total=words.length,t0=Date.now();
let tested=0,found=null;
for(let i=0;i<words.length;i++){
if(bruteAbort) break;
const w=words[i];
const sig=await hmacSign(w,bruteSignIn,alg);
tested++;
if(tested%5===0||tested===total){
const el=(Date.now()-t0)/1000,pct=Math.round(tested/total*100),sp=el>0?Math.round(tested/el):0;
document.getElementById('bpbar').style.width=pct+'%';
document.getElementById('bstatus').textContent=`Testing "${w}" … ${tested}/${total}`;
document.getElementById('sTested').textContent=tested;
document.getElementById('sSpeed').textContent=sp.toLocaleString();
document.getElementById('sTime').textContent=el.toFixed(1)+'s';
document.getElementById('sLeft').textContent=sp>0?fmtDur(Math.round((total-tested)/sp)):'—';
await new Promise(r=>setTimeout(r,0));
}
if(bytesEq(sig,bruteSigBytes)){found=w;break}
}
const elapsed=((Date.now()-t0)/1000).toFixed(2);
bruteRunning=false;document.getElementById('bruteBtn').textContent='▶ Run';
if(found){
document.getElementById('bpbar').style.background='var(--red)';document.getElementById('bpbar').style.width='100%';
document.getElementById('bstatus').textContent=`🔴 Cracked in ${elapsed}s`;
document.getElementById('bruteResult').innerHTML=`<div class="crackbox"><div class="clabel">🔴 SECRET CRACKED</div><div class="csecret">${esc(found)}</div><div style="font-size:10.5px;color:var(--text2);margin-top:4px">All tokens signed with this secret are compromised. Rotate immediately.</div></div><div class="fixblock" style="margin-top:8px"><div class="fixhdr"><span>🐍 Rotate Secret (Python)</span></div><div class="fixcode"><span class="pk">import</span> <span class="pb">secrets</span>
<span class="pc"># Cracked: "${esc(found)}"</span>
<span class="pv">NEW_SECRET</span> = secrets.token_hex(<span class="pn">32</span>) <span class="pc"># 256-bit</span>
<span class="pc"># Invalidate all tokens:</span>
<span class="pc"># 1. Update SECRET in env/KMS</span>
<span class="pc"># 2. Add token_version to User model</span>
<span class="pc"># 3. Increment version for ALL users</span>
<span class="pc"># 4. Reject tokens where payload.version != db.version</span></div></div>`;
} else if(bruteAbort){
document.getElementById('bstatus').textContent=`Stopped at ${tested}/${words.length}`;
} else {
document.getElementById('bpbar').style.background='var(--green)';document.getElementById('bpbar').style.width='100%';
document.getElementById('bstatus').textContent=`✓ Not found in ${words.length} words (${elapsed}s)`;
document.getElementById('bruteResult').innerHTML='<div class="safebox">🟢 Secret not in this wordlist. Try a larger list or custom words — absence here does not confirm the secret is strong.</div>';
}
}
// ── VERIFY SIG DONE ABOVE ──
// ── FORGE ──
let FC={h:[{k:'alg',v:'HS256'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'user_123'},{k:'role',v:'user'},{k:'iat',v:String(NOW)},{k:'exp',v:String(NOW+900)}]};
function initForge(){renderFClaims()}
function renderFClaims(){
const sec={h:'forgeHClaims',p:'forgePClaims'};
['h','p'].forEach(s=>{
document.getElementById(sec[s]).innerHTML=FC[s].map((c,i)=>`
<div class="crow">
<input class="inp ckey" value="${esc(c.k)}" placeholder="key" oninput="FC['${s}'][${i}].k=this.value">
<input class="inp" value="${esc(c.v)}" placeholder="value" oninput="FC['${s}'][${i}].v=this.value" style="flex:1">
<button class="cdel" onclick="remClaim('${s}',${i})">×</button>
</div>`).join('');
});
}
function addClaim(s){FC[s].push({k:'',v:''});renderFClaims()}
function remClaim(s,i){FC[s].splice(i,1);renderFClaims()}
function parseVal(v){
if(v==='true')return true;if(v==='false')return false;if(v==='null')return null;
const n=Number(v);if(!isNaN(n)&&v!=='')return n;
try{return JSON.parse(v)}catch(e){return v}
}
async function forgeToken(){
const hObj={},pObj={};
FC.h.forEach(c=>{if(c.k)hObj[c.k]=parseVal(c.v)});
FC.p.forEach(c=>{if(c.k)pObj[c.k]=parseVal(c.v)});
const h64=b64url(hObj),p64=b64url(pObj);
const secret=document.getElementById('forgeSecret').value;
const alg=document.getElementById('forgeAlg').value;
let token;
if(alg==='none'||!secret){
token=h64+'.'+p64+'.';
} else {
const sig=await hmacSign(secret,h64+'.'+p64,alg);
token=h64+'.'+p64+'.'+u8toB64url(sig);
}
document.getElementById('forgeOut').textContent=token;
document.getElementById('forgePreview').innerHTML=`
<div class="dblock"><div class="dbhdr"><span class="lh">● Header</span></div><div class="dbbody">${colorJson(hObj)}</div></div>
<div class="dblock"><div class="dbhdr"><span class="lp">● Payload</span></div><div class="dbbody">${colorJson(pObj)}</div></div>`;
}
function resetForge(){
FC={h:[{k:'alg',v:'HS256'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'user_123'},{k:'role',v:'user'},{k:'iat',v:String(NOW)},{k:'exp',v:String(NOW+900)}]};
document.getElementById('forgeSecret').value='';
document.getElementById('forgeOut').textContent='Token appears here after generation…';
document.getElementById('forgePreview').innerHTML='<div class="empty"><div class="eicon">⚗️</div>Generate a token to preview it</div>';
renderFClaims();
}
function loadForgeFromAnalysis(){
if(!curHdr||!curPay){toast('Analyze a token first');return}
FC.h=Object.entries(curHdr).map(([k,v])=>({k,v:typeof v==='string'?v:JSON.stringify(v)}));
FC.p=Object.entries(curPay).map(([k,v])=>({k,v:typeof v==='string'?v:JSON.stringify(v)}));
renderFClaims(); toast('Loaded from current token');
}
function copyForged(){
const t=document.getElementById('forgeOut').textContent;
if(t.includes('appears here')) return;
navigator.clipboard.writeText(t).then(()=>toast('Token copied!'));
}
function sendForgedToAnalyzer(){
const t=document.getElementById('forgeOut').textContent;
if(t.includes('appears here')) return;
document.getElementById('tokenInput').value=t;
liveUpdate(); doAnalyze(); switchTabById('analyze'); toast('Sent to Analyzer');
}
function applyPreset(p){
const PR={
admin:{h:[{k:'alg',v:'HS256'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'user_123'},{k:'role',v:'admin'},{k:'is_admin',v:'true'},{k:'iat',v:String(NOW)},{k:'exp',v:String(NOW+900)}]},
longexp:{h:[{k:'alg',v:'HS256'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'user_123'},{k:'role',v:'user'},{k:'iat',v:String(NOW)},{k:'exp',v:String(NOW+86400*30)}]},
noexp:{h:[{k:'alg',v:'HS256'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'user_123'},{k:'role',v:'user'},{k:'iat',v:String(NOW)}]},
algnone:{h:[{k:'alg',v:'none'},{k:'typ',v:'JWT'}],p:[{k:'sub',v:'attacker'},{k:'role',v:'admin'},{k:'iat',v:String(NOW)}]},
minimal:{h:[{k:'alg',v:'HS256'}],p:[{k:'sub',v:'user_123'}]},
rs256hdr:{h:[{k:'alg',v:'RS256'},{k:'typ',v:'JWT'},{k:'kid',v:'key-2024-01'}],p:[{k:'sub',v:'user_123'},{k:'iss',v:'https://auth.myapp.com'},{k:'aud',v:'myapp-api'},{k:'iat',v:String(NOW)},{k:'exp',v:String(NOW+900)},{k:'jti',v:'jti-'+Math.random().toString(36).slice(2)}]}
};
if(PR[p]){FC=PR[p];renderFClaims()}
}
// ── ATTACK DEMO ──
async function demoAttack(type){
const el=document.getElementById('attackOut');
let token='',desc='',label='';
if(type==='none'){
const h=b64url({alg:'none',typ:'JWT'}),p=b64url({sub:'victim',role:'admin',iat:NOW,exp:NOW+3600});
token=h+'.'+p+'.';
label='alg:none Forged Admin Token';
desc='Attacker decoded a user token, changed <code style="color:var(--amber);font-family:var(--mono)">role:"user"</code> → <code style="color:var(--red);font-family:var(--mono)">role:"admin"</code>, set <code style="color:var(--amber);font-family:var(--mono)">alg:"none"</code>, removed signature. Vulnerable servers accept it with no verification.';
} else if(type==='algconfusion'){
const h=b64url({alg:'HS256',typ:'JWT'}),p=b64url({sub:'attacker',role:'admin',iss:'https://auth.myapp.com',iat:NOW,exp:NOW+3600});
const fakeSig=await hmacSign('<RSA_PUBLIC_KEY_BYTES_HERE>',h+'.'+p,'HS256');
token=h+'.'+p+'.'+u8toB64url(fakeSig);
label='Algorithm Confusion Attack Token';
desc='Server uses RS256. Attacker downloads the public key, flips header to <code style="color:var(--red);font-family:var(--mono)">HS256</code>, signs using the public key as HMAC secret. Server verifies with public key — it matches. Admin granted.';
} else if(type==='kid'){
const h=b64url({alg:'HS256',typ:'JWT',kid:"../../dev/null'; DROP TABLE keys;--"}),p=b64url({sub:'injector',role:'superadmin',iat:NOW,exp:NOW+86400});
token=h+'.'+p+'.injectionPayload';
label='kid Injection Attack Token';
desc='kid contains path traversal + SQL injection. If the server passes kid unsanitized to filesystem or DB, attacker controls key lookup or crashes the system.';
} else if(type==='bruteforce'){
const h=b64url({alg:'HS256',typ:'JWT'}),p=b64url({sub:'user_123',role:'user',iat:NOW-3600,exp:NOW+3600});
const sig=await hmacSign('secret',h+'.'+p,'HS256');
token=h+'.'+p+'.'+u8toB64url(sig);
label='Weak HS256 Token (secret: "secret")';
desc='Signed with <code style="color:var(--red);font-family:var(--mono)">"secret"</code> — #1 in every wordlist. Send to Analyzer tab and run brute-force — cracks in under 1 second.';
} else if(type==='replay'){
const h=b64url({alg:'HS256',typ:'JWT'}),p=b64url({sub:'user_123',role:'user',iat:NOW-7200});
const sig=await hmacSign('somekey',h+'.'+p,'HS256');
token=h+'.'+p+'.'+u8toB64url(sig);
label='No-Expiry Replay Token';
desc='No <code style="color:var(--red);font-family:var(--mono)">exp</code>, no <code style="color:var(--red);font-family:var(--mono)">jti</code>. Issued 2 hours ago but permanently valid. Intercepted from logs, network traffic, or browser history — good forever.';
} else if(type==='privesc'){
const h=b64url({alg:'HS256',typ:'JWT'}),p=b64url({sub:'user_123',role:'admin',permissions:['read','write','delete','admin'],iat:NOW,exp:NOW+3600});
const sig=await hmacSign('weakkey',h+'.'+p,'HS256');
token=h+'.'+p+'.'+u8toB64url(sig);
label='Privilege Escalation Token';
desc='Payload tampered: <code style="color:var(--amber);font-family:var(--mono)">role:"user"</code> → <code style="color:var(--red);font-family:var(--mono)">role:"admin"</code> with full permissions array. If sig verification is misconfigured, this grants admin access.';
}
const parts=token.split('.');
el.innerHTML=`
<div style="background:rgba(239,68,68,0.08);border:1px solid rgba(239,68,68,0.2);border-radius:8px;padding:9px 12px;margin-bottom:9px">
<div style="font-size:10px;color:var(--red);font-weight:600;letter-spacing:.4px;margin-bottom:3px">⚠ ${label}</div>
<div style="font-size:11px;color:var(--text2);line-height:1.6;margin-bottom:7px">${desc}</div>
<div style="font-family:var(--mono);font-size:10px;word-break:break-all;line-height:1.8">
<span class="jh">${esc(parts[0]||'')}</span><span class="jdot">.</span><span class="jp">${esc(parts[1]||'')}</span><span class="jdot">.</span><span class="js">${esc(parts[2]||'')}</span>
</div>
</div>
<div class="brow">
<button class="btn btn-sm" onclick="sendAttackToAnalyzer(this)">→ Send to Analyzer</button>
<button class="btn btn-sm" onclick="navigator.clipboard.writeText(this.dataset.t).then(()=>toast('Copied!'))" data-t="${esc(token)}">⎘ Copy</button>
</div>`;
el.querySelector('[onclick*="sendAttackToAnalyzer"]').dataset.t=token;
el.querySelector('[onclick*="sendAttackToAnalyzer"]').onclick=()=>{
document.getElementById('tokenInput').value=token;
liveUpdate(); doAnalyze(); switchTabById('analyze');
};
}
// ── HISTORY ──
function saveHist(token,h,p,score,findings){
const e={id:Date.now(),token,alg:h?h.alg:'?',sub:p?(p.sub||'—'):'—',score,crits:findings.filter(f=>f.sev==='critical').length,ts:new Date().toLocaleTimeString()};
history.unshift(e);if(history.length>50)history=history.slice(0,50);
try{localStorage.setItem('jwtHist',JSON.stringify(history))}catch(e2){}
}
function renderHistory(){
const el=document.getElementById('historyList');
if(!history.length){el.innerHTML='<div class="empty"><div class="eicon">📜</div>No history yet. Analyze a token first.</div>';return}
el.innerHTML=history.map(e=>{
const ac=['HS256','HS384','HS512'].includes(e.alg)?'halg-h':e.alg==='none'?'halg-n':'halg-a';
const col=e.score>=80?'var(--green)':e.score>=50?'var(--amber)':'var(--red)';
const prev=e.token.length>55?e.token.substring(0,55)+'…':e.token;
return`<div class="histitem" onclick="loadHE(${e.id})">
<span class="halg ${ac}">${esc(e.alg||'?')}</span>
<div style="flex:1;min-width:0">
<div class="hsub">sub: ${esc(e.sub)} ${e.crits>0?`<span style="font-size:9.5px;background:rgba(239,68,68,0.15);color:var(--red);padding:1px 5px;border-radius:3px;margin-left:4px">${e.crits} crit</span>`:''}</div>
<div class="hprev">${esc(prev)}</div>
</div>
<div style="text-align:right;flex-shrink:0">
<div style="font-size:11px;font-family:var(--mono);font-weight:600;color:${col}">${e.score}</div>
<div style="font-size:9.5px;color:var(--text3)">${e.ts}</div>
</div>
</div>`;
}).join('');
}
function loadHE(id){
const e=history.find(h=>h.id===id);if(!e)return;
document.getElementById('tokenInput').value=e.token;
liveUpdate();doAnalyze();switchTabById('analyze');
}
function clearHistory(){history=[];try{localStorage.removeItem('jwtHist')}catch(e){}renderHistory()}
function exportHistory(){download('jwt-history.json',JSON.stringify(history,null,2),'application/json');toast('History exported!')}
// ── MISC ──
function clearAll(){
document.getElementById('tokenInput').value='';
document.getElementById('tokenColored').innerHTML='<span style="color:var(--text3);font-family:var(--mono);font-size:11px">Paste a token above…</span>';
document.getElementById('decodeSection').innerHTML='<div class="empty"><div class="eicon">🔍</div>Header · Payload · Signature appear here</div>';
document.getElementById('analysisContainer').innerHTML='<div class="empty"><div class="eicon">🛡️</div>Analyze a token to see findings,<br>score, timestamps and Python fix</div>';