JWT Decoder & Encoder
Decode JWT tokens to inspect their structure or encode new tokens for testing. Support for multiple algorithms and custom claims.
About JWT
JSON Web Tokens (JWT) are an open standard (RFC 7519) for securely transmitting information between parties as a JSON object.
JWT Structure:
- Header: Contains the token type and signing algorithm
- Payload: Contains claims (statements about an entity)
- Signature: Ensures the token hasn't been altered
Common Claims:
- iat: Issued at time (Unix timestamp)
- exp: Expiration time (Unix timestamp)
- sub: Subject (user ID)
- iss: Issuer
- aud: Audience
⚠️ Security Note: This tool only decodes JWTs, it does not verify signatures. Never paste sensitive tokens on untrusted websites.