What is Microsoft Graph API?

Microsoft Graph API is a unified REST API provided by Microsoft that lets you access Microsoft 365 services like:

📧 Outlook Mail & Calendar

👤 Users & Groups

🗂️ OneDrive & SharePoint Files

📝 Microsoft Teams

✅ To-Do, Tasks, Planner, and more

It’s the gateway to data and intelligence in Microsoft 365.

📁 What is OneDrive Downloader using Graph API?

A OneDrive Downloader is an app that: Connects to a Microsoft account or organization Accesses the OneDrive files and folders Downloads files programmatically

This is done through Microsoft Graph's Files API.

🛠️ Key Graph API Endpoints for OneDrive

🔹 Get the root drive http GET /me/drive

🔹 List files in a folder http GET /me/drive/root/children GET /me/drive/root:/Documents:/children

🔹 Download a file http GET /me/drive/items/{item-id}/content

Or by path: http GET /me/drive/root:/Documents/file.txt:/content This returns the raw file stream, which you can save locally.

🧩 Authentication Required

Graph API uses Azure Active Directory (AAD) for auth.

You can authenticate using: Authorization Code Flow (for user login) Client Credentials Flow (for app-only access) Requires application registration in Azure Portal