Browser-based JWT Payload Inspector & Decoder
Decode and inspect JSON Web Tokens securely offline. View JWT headers and payload claims instantly.
Input
JWTOutput
Decoded JSONYour converted output will appear here
How to Use Browser-based JWT Payload Inspector & Decoder
The decoder splits the JWT by dots, Base64-decodes each part, and parses the JSON. It displays the header, payload, and identifies common claims like exp, iat, sub.
🔒 Privacy First: This tool runs entirely in your browser. Your data never leaves your computer.
Common Use Cases
- Debug authentication issues
- Inspect token claims and expiration
- Verify token structure during development
- Analyze third-party API tokens
- Debug JWT contents without backend logs
Browser-based JWT Payload Inspector & Decoder FAQ
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication. It contains a header, payload, and signature.
This tool decodes and displays JWT contents. Signature verification would require the secret key, which should never be shared.
Yes! Decoding happens entirely in your browser. However, never share JWTs publicly as they may contain sensitive data.
Check the "exp" (expiration) claim in the payload. If it's in the past, the token is expired and should be refreshed.