Developers

JWT Decoder

Decode and analyze JWT tokens

JWT Decoder
Warning: This tool only decodes JWT and does not verify the signature. Never share real JWT tokens with online tools.
JWT Token
Paste a JWT token to decode and view its contents
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About this Tool

JWT Decoder — Understand JSON Web Token Structure

JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a digitally signed JSON object, widely used for authentication and authorization in web apps and APIs.

JWT Structure

  • Header: specifies the token type and signing algorithm (e.g., HS256, RS256)
  • Payload: contains the claims — user identity, permissions, and expiration
  • Signature: ensures the token hasn't been tampered with

Common Claims

  • sub — subject (user ID) · iss — issuer · aud — audience
  • iat — issued at · exp — expiration · nbf — not before

Security Note

JWT is Base64-encoded, not encrypted — anyone with the token can read its payload. Never put sensitive data in the payload, and never share real tokens with online tools.

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