JWT Decoder
Decode and analyze JSON Web Tokens (JWT). Inspect headers, payloads, expiration times, and understand token structure for authentication and security analysis.
Security Notice:
This tool only decodes JWT tokens client-side. Never paste sensitive production tokens. JWT signatures cannot be verified without the secret key.
About JWT Tokens:
Structure
- • Header: Token type and algorithm
- • Payload: Claims and user data
- • Signature: Verification signature
- • Format: header.payload.signature
Common Claims
- • iss: Issuer of the token
- • sub: Subject (user identifier)
- • exp: Expiration time
- • iat: Issued at time
Security Note: JWTs are encoded, not encrypted. They can be decoded by anyone, so never include sensitive information in the payload.
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