How our JWT Decoder works
JSON Web Tokens (JWT) are an open standard for securely transmitting information between parties as a JSON object. A standard JWT consists of three parts separated by dots: Header, Payload, and Signature. This tool uses native JavaScript to safely Base64Url-decode the Header and Payload portions, formatting them into readable JSON directly in your browser.
JWT Decoder FAQ
Is it safe to paste my token here?
Yes. This tool is built entirely with client-side JavaScript. Your tokens are processed locally on your device and are never transmitted to our servers or saved in any database, ensuring absolute privacy for your sensitive API tokens.
Does this tool verify the signature?
No, this tool acts only as a decoder, not a verifier. It will decode and display the contents of the Header and Payload regardless of whether the Signature is valid. To verify a signature, you would need the original secret key, which should never be pasted into public web tools.