Paste any JWT and instantly decode the header, payload and signature. View all claims, check expiry, inspect issued-at — all in your browser. Your tokens are never sent to any server.
The JWT Decoder by WorldOfTools is a premium, free developer utility designed to instantly decode JSON Web Tokens (JWT). JWTs are the industry standard for securely transmitting information between parties as a JSON object, heavily used in modern web authentication, Single Sign-On (SSO), and RESTful APIs.
Our tool instantly cracks open the Base64Url-encoded token to reveal its three distinct parts: the Header (algorithm and token type), the Payload (the actual claims or data being transmitted), and the Signature. Built strictly for developers, this tool runs entirely locally in your browser. This means your sensitive authentication tokens and session data are never uploaded to our servers, ensuring 100% security and privacy.
Paste the Token: A standard JWT looks like three long strings of random characters separated by dots (e.g., xxxxx.yyyyy.zzzzz). Paste this complete string into the input box.
Instant Decoding: The tool instantly splits the token by its periods and decodes the Base64Url strings.
Analyze the Payload: View the decoded JSON payload. You will easily spot standard claims like sub (subject/user ID), iat (issued at timestamp), and exp (expiration timestamp), alongside any custom user data.
Currently, this tool acts as a decoder, meaning it reads the public Header and Payload information. To cryptographically verify the signature, you must possess the secret key or the public/private key pair used by the issuing server.
No! This is a critical security concept. A standard JWT (JWS) is signed, but it is NOT encrypted. Anyone who intercepts the token can easily decode the Base64 string and read the payload. You should never store sensitive data like passwords or credit card numbers inside a JWT payload.
JWTs use standard Unix timestamps (the number of seconds since January 1, 1970) for dates like the expiration (exp) and issued at (iat) claims. Our tool automatically displays the raw integer, but you can use an epoch converter to see the human-readable date.
Yes. The decoding process utilizes the browser's native JavaScript functions (`atob()`). The token string never leaves your local machine, ensuring your active session tokens cannot be hijacked.