JWT Decoder

Inspect JSON Web Tokens

Everything runs locally in your browser. Your data never leaves your device.

Input

About this tool

Paste a JSON Web Token to decode its header and payload into readable JSON. Timestamps such as expiration (exp) and issued-at (iat) are converted to human-readable dates so you can quickly verify a token's claims.

Frequently asked questions

Does this verify the signature?

No. This tool decodes the token for inspection only. Signature verification requires the secret or public key, which should stay on your server.

Is the token uploaded anywhere?

Never. Decoding is performed entirely in your browser.