JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, claims, expiry status, and security warnings.

JWT Authentication Tokens

Input

Output

This tool runs entirely in your browser. No data is sent to any server.

How this works

JWT Token Analysis and Security Pitfalls Decode and inspect JSON Web Tokens. Detect algorithm confusion attacks, missing signature verification, excessive claims, and insecure token storage.

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