A JSON Web Token (JWT) is an open standard (RFC 7519) for transmitting information compactly and securely between parties as a signed JSON object. A JWT consists of three parts separated by dots: header (algorithm and token type), payload (the data or claims), and signature (the signature that verifies integrity). This tool decodes the first two parts to inspect their contents.

Paste a JWT token to see its decoded header, payload, and signature.