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Deep-dive into JSON Web Tokens. Decode headers and claims instantly with our secure, zero-server extraction engine.
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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.
The header typically consists of two parts: the type of the token (JWT) and the signing algorithm being used (such as HMAC SHA256 or RSA).
The second part of the token is the payload, which contains the claims. Claims are statements about an entity (typically, the user) and additional data.
Professional JWT extractor and debugger. Inspect JWT header, payload, and signature. Secure client-side decoding for JSON Web Tokens without risk.
In its compact form, JSON Web Tokens consist of three parts separated by dots (.), which are Header, Payload, and Signature. Therefore, a JWT typically looks like `xxxxx.yyyyy.zzzzz`. Each part is Base64Url encoded. Our extractor takes this string and performs the necessary transformations to show the human-readable JSON stored inside.
The header and payload are simply encoded data. They are not encrypted by default, meaning anyone with the token can see the content. This is a common misconception; JWTs are for integrity, not confidentiality. Use this tool to verify exactly what data you are exposing in your application tokens.