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JWT Decoder

Decode the readable parts of a JSON Web Token without uploading credentials. Review claims, timestamps and token structure during API debugging.

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FIELD NOTES

Reading a JSON Web Token

A JWT normally contains Base64URL-encoded header, payload and signature segments. The payload often carries claims such as issuer, subject and expiration.

Decoding is not signature verification. Never treat displayed claims as trusted until a server verifies the signature and expected algorithm.

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REFERENCE

Common questions

Can this verify a JWT signature?

No. It only decodes the header and payload for inspection; verification requires the correct key and server-side checks.

Does this tool upload my input?

No. Processing uses browser APIs and the input is not sent to our server.