JWT Decoder

JSON Web Tokens (JWTs) are widely used for authentication and authorization in modern web applications. This tool lets you quickly decode and inspect any JWT token without sending it to a server. Simply paste your token to see the decoded header (algorithm, token type) and payload (all claims) formatted as readable JSON. The tool automatically identifies standard claims such as issuer, subject, audience, issued-at, and expiry, displaying them in a human-friendly summary with timestamps converted to local time. An expiry banner instantly tells you whether the token is currently valid or has expired. Note: this tool does not verify the cryptographic signature — it only decodes the token for inspection. Never share tokens containing sensitive data.