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JWT Decoder
Decode JSON Web Tokens to view the header, payload, and signature. Automatically checks token expiration and displays timestamps in readable format.
About JWT Tokens
JWT (JSON Web Tokens) consists of three parts separated by dots:
- Header: Contains the token type (JWT) and signing algorithm (e.g., HS256)
- Payload: Contains the claims (user data, permissions, etc.)
- Signature: Verifies the token hasn't been tampered with
Common payload claims include: iss (issuer), sub (subject), exp (expiration), iat (issued at)