JWT Decoder
EncodersQuickly decode and inspect JSON Web Tokens (JWT) with our free online parser. This tool helps developers instantly view headers, payloads, and signatures to debug authentication flows and verify claims.
JWT Token
Decoded JSON
Quickly decode and inspect JSON Web Tokens (JWT) with our free online parser. This tool helps developers instantly view headers, payloads, and signatures to debug authentication flows and verify claims.
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Tip
Check the 'exp' claim to verify exactly when a token will expire and cause auth failures.
Did You Know?
JWTs are encoded using Base64Url, which is slightly different from standard Base64 to be URL-safe.
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. It consists of three parts separated by dots: a Header, a Payload, and a Signature. JWTs are commonly used for authorization and information exchange in modern web applications and microservices.
Best Practice
Never store sensitive data like passwords or private keys in a JWT as it is easily decoded.
When developing OAuth2 or OpenID Connect flows, you can use this decoder to inspect tokens retrieved from your identity provider. It is particularly useful for checking the 'exp' (expiration) claim to troubleshoot session timeouts or 'scp' (scope) claims to debug permission issues. Keep this tool open in your browser tab for rapid debugging during API development.
Q: Is my token data secure when using this tool? A: Yes, the decoding process is performed locally in your browser using JavaScript, meaning your token is never sent to our servers.
Q: Can this tool verify the signature of my JWT? A: This specific tool is a decoder intended for inspection. Verification typically requires access to a secret key or public certificate which should not be shared online.
Q: Why does my JWT look like three random strings? A: A JWT is composed of Base64Url encoded segments (Header, Payload, and Signature) joined by periods. Our tool decodes these into readable JSON.
Q: Does this tool support nested JWTs? A: This decoder is optimized for standard three-part JWTs used in most web authentication scenarios.