What decoding reveals
JWT segments use Base64URL encoding. Decoding exposes algorithm metadata and claims such as subject, audience, issuer, and expiration.
JWT Decoder
Decode JSON Web Token headers and payload claims locally without uploading the token.
JWT decoder workspace
Paste a compact token to inspect its JSON header and payload.
Decoded, not verified
Reading a token does not prove its signature is valid or that its claims should be trusted.
Header
Payload
Decoding is not verification
Anyone can construct a token payload. Verify the signature and expected claims before trusting a token in an application.