Paste your JWT to instantly inspect its header, payload claims, and verify its signature. All processing happens in your browser—your tokens are never sent to our servers.
Paste a JSON Web Token on the left to decode its header, payload, and inspect its signature.
A JWT (JSON Web Token) decoder is an essential developer tool used to parse, inspect, and validate authentication tokens. JWTs are widely used in modern web applications to securely transmit information between a client and a server. Our free JWT Decoder allows you to instantly unpack the token into its three core components: the Header, the Payload, and the Signature.
When debugging API authentication, OAuth flows, or single sign-on (SSO) integrations, developers often need to check the claims embedded inside a JWT. By pasting your token into our tool, you can verify critical information such as:
exp)iat)sub)iss)Unlike many online developer tools that silently log your inputs, our JWT Decoder is built with privacy-first architecture. All decoding, base64url parsing, and formatting is executed locally inside your browser using JavaScript. Your sensitive access tokens and identity claims never touch a backend server, ensuring your production credentials remain secure.
A standard JWT consists of three parts separated by dots (.):
// Header { "alg": "HS256", "typ": "JWT" } // Payload { "sub": "1234567890", "name": "John Doe", "iat": 1516239022 }
Yes. Our decoder runs entirely client-side in your browser. Your JSON Web Tokens are never transmitted to our servers or logged.
Yes, you can read the header and the payload of any JWT without the secret key because they are merely Base64Url encoded, not encrypted. However, you need the secret to verify the signature.
A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.
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