JWT Decoder
Decode and verify JSON Web Tokens (JWT). Free online JWT decoder with header and payload inspection.
Token Information
Algorithm:
Type:
Expires:
Issued At:
About JWT Decoder
JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. This tool decodes JWT tokens and displays the header and payload in a readable format.
Features
- Decode JWT header and payload
- Display token algorithm and type
- Show expiration and issued-at timestamps
- Format JSON output for readability
- Client-side decoding - your tokens never leave your browser
Security Note
This tool only decodes JWT tokens - it does not verify signatures. JWT tokens are encoded, not encrypted, so the header and payload can be read by anyone. Never put sensitive information in a JWT without proper encryption.
JWT Structure
A JWT consists of three parts separated by dots (.):
- Header: Contains token type and signing algorithm
- Payload: Contains claims (user data, expiration, etc.)
- Signature: Used to verify the token hasn't been tampered with