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
Learn More About JWT
Want to understand how JWT tokens work? Check out our comprehensive guide covering JWT structure, security, and best practices.
Read the complete JWT guide →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.