JWT Decoder
Decode JSON Web Tokens to inspect their header and payload. Automatically detects and highlights expired tokens. No signature verification for privacy.
Paste a JWT token to decode it
How to Use
- 1
Paste your JWT
Paste a JSON Web Token into the input field. The token should have three parts separated by dots.
- 2
View decoded data
The header and payload will be automatically decoded and displayed with syntax highlighting.
- 3
Check expiration
If the token has an expiration claim (exp), it will be highlighted if the token has expired.
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: a header (algorithm and type), a payload (claims/data), and a signature. JWTs are commonly used for authentication and authorization.
- •Debugging authentication issues
- •Inspecting token claims and expiration
- •Verifying token structure before implementation
- •Understanding OAuth/OIDC responses
- •Checking user permissions encoded in tokens
Security Note: This tool decodes but does not verify JWT signatures. Never trust a JWT's contents without verifying its signature on your server.