What are the three parts of a JWT?

A JWT consists of three Base64URL-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims/data), and the Signature (used to verify the token authenticity).

Is decoding the same as verifying a JWT?

No. Decoding simply reads the Base64URL-encoded data and makes it human-readable. Verification checks the signature using a secret or public key to ensure the token has not been tampered with. This tool decodes but does not verify signatures.

Is it safe to paste my JWT here?

Yes. Decoding happens entirely in your browser — no token data is ever sent to a server. However, avoid sharing JWTs that contain sensitive production credentials with any online tool.

What does the exp claim mean?

The exp (expiration time) claim identifies the time after which the token must not be accepted. It is expressed as a Unix timestamp (seconds since January 1, 1970). This tool automatically converts it to a readable date and shows whether the token is expired.

What algorithms do JWT tokens use?

The most common JWT signing algorithms are HS256 (HMAC-SHA256), HS384, HS512, RS256 (RSA with SHA-256), and ES256 (ECDSA). The algorithm is specified in the alg field of the token header.

JWT Decoder — Decode and Inspect JSON Web Tokens Online

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JWT Decoder

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Frequently Asked Questions

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a compact, URL-safe JSON object. It is commonly used for authentication and authorization in web applications.

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