Does it verify the JWT signature?

No. This tool only decodes (Base64 decodes) the header and payload sections for inspection. Signature verification requires the secret key or public certificate, which you should never share with a web tool.

Is it safe to paste my JWT here?

Tokens are decoded entirely in your browser — nothing is sent to a server. However, JWTs often contain sensitive user data, so use caution and consider using a test token.

What does "exp" claim mean?

"exp" (expiration time) is a Unix timestamp indicating when the token expires. The tool shows this as a human-readable datetime and tells you whether the token is currently expired, valid, or not yet active (nbf).

What are the three parts of a JWT?

A JWT has three Base64url-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims/data), and the Signature (cryptographic proof). Only the first two contain readable data.

JWT Decoder

Decodes JSON Web Tokens (JWT) and displays the header, payload, and signature sections in a readable format. Automatically parses standard claims (iss, sub, aud, exp, iat, nbf) and shows whether the token is expired or not yet valid. Note: this tool decodes only — it does not verify the signature.

Runs entirely in your browser — your input is never uploaded, stored, or logged.

Paste your JWT and instantly inspect the token contents — useful for debugging authentication issues. To decode the raw Base64 sections manually, use the Base64 to Text decoder.

Examples

Sample JWT

Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

Output

Header: {"alg":"HS256","typ":"JWT"} | Payload: {"sub":"1234"}

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