JWT Decoder
Decode and validate JWT tokens. View header, payload, signature, expiration status, and algorithm information.
About JWT Tokens:
- JWT Structure: Header.Payload.Signature (3 parts separated by dots)
- Header: Contains algorithm and token type
- Payload: Contains claims (data) - can include exp (expiration), iat (issued at), sub (subject), etc.
- Signature: Used to verify token integrity (not decoded, only displayed)
- This tool only decodes tokens. It does not verify signatures or validate against a secret key.