JWT Decoder
Decode and analyze JSON Web Tokens
Security Notice: This tool decodes JWTs client-side. Never paste sensitive tokens on untrusted websites.
JWT Token
About JWT
JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. A JWT consists of three parts:
- Header: Contains metadata about the token (algorithm, type)
- Payload: Contains the claims (user data, permissions, expiration)
- Signature: Verifies the token hasn't been tampered with
Note: This tool only decodes the JWT. It does not verify the signature. Always verify JWTs on the server-side using the secret key.