Decode and view the contents of JSON Web Tokens instantly. 100% private and secure in your browser.
Encoded Token
Warning: Tokens are parsed entirely in your browser. No data is sent to our servers.
Decoded Data
Paste a token to see decoded data.
Frequently Asked Questions
A JSON Web Token (JWT) is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Yes, if done correctly. Our tool decodes your token completely in your browser without sending any data to our servers. This ensures your sensitive tokens remain 100% private and secure.
A JWT is composed of three parts separated by dots: the Header (containing the token type and signing algorithm), the Payload (containing the claims or data about the user), and the Signature (used to verify the token hasn't been tampered with).
Currently, this tool only decodes the Base64Url encoded header and payload to make them human-readable. It does not verify the cryptographic signature since that requires your private secret key, which you should never paste online.