Decode and inspect JSON Web Tokens — 100% browser‑side, no data leaves your machine.
Paste a JWT above and click Decode to inspect its contents.
A JWT Decoder is an essential developer tool used to parse, inspect, and verify JSON Web Tokens (JWT). JWTs are a standard method (RFC 7519) for securely transmitting information between parties as a JSON object. Because the token is Base64Url encoded, it appears as a random string of characters. A JWT Decoder translates this string back into a readable JSON format, allowing you to see the headers, payload, and claims inside.
When implementing authentication and authorization systems (like OAuth2 or OpenID Connect), developers constantly interact with JWTs. If a user is denied access or a session expires prematurely, the first step in debugging is inspecting the token. An Online JWT Decoder allows you to verify the token's issuer, expiration time (exp), subject (sub), and custom roles without needing to write custom decoding scripts.
Using our platform to decode a JWT is fast and secure:
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.
Simply paste your encoded JWT string into our JWT Decoder tool. It will instantly parse the token and display the readable JSON header and payload directly in your browser.
Yes. Our JWT Decoder operates entirely on the client side. Your tokens are processed locally in your browser and are never uploaded or stored on our servers.
Standard JWTs are Base64Url encoded, not encrypted. This means anyone can decode and read the payload without the secret key. However, the secret is required to verify the signature and ensure the data hasn't been tampered with.
The signature is created by taking the encoded header, the encoded payload, a secret, and the algorithm specified in the header. It ensures the token has not been altered in transit.