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JSON Web Token (JWT) Decoder

Decode, debug, and inspect JSON Web Tokens (JWTs) client-side in real time. Instantly parse the Base64URL-encoded header, payload claims, expiration timestamps, algorithm type, and token validity without transmitting your credentials or tokens across the internet.

#jwt#jwt decoder#token#auth#developer#security#base64
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How to Use JSON Web Token (JWT) Decoder

  1. 1Paste your JSON Web Token string into the input box.
  2. 2The tool automatically splits the token into Header, Payload, and Signature parts.
  3. 3Review formatted JSON claims, signing algorithm, and expiration status.
  4. 4Click 'Copy' to grab the decoded payload or header JSON for debugging.

Frequently Asked Questions

What is a JSON Web Token (JWT)?

A JSON Web Token (JWT) is an open industry standard (RFC 7519) for securely transmitting information between parties as a compact, self-contained JSON object. It is widely used in modern web applications for user authentication and API authorization.

Is it safe to decode my JWT here?

Yes, 100% safe. This tool performs all Base64URL decoding and JSON formatting entirely in your local browser memory using client-side JavaScript. Your token is never uploaded, logged, or sent to any server.

Does this tool verify the cryptographic signature?

No. Decoding a JWT reads the claims contained in the header and payload, but validating the cryptographic signature requires the server's private key or secret. For security reasons, never paste your private signing keys into web tools.

What do 'iat' and 'exp' claims mean in a JWT?

'iat' stands for 'Issued At' and indicates the Unix epoch timestamp when the token was generated. 'exp' stands for 'Expiration Time', after which the token is invalid and must be rejected by authentication servers.

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