JWK Inspector
Paste a JWK Set, JWS (JWT), or JWE token to inspect its structure. Everything runs in your browser — nothing is sent to any server.
Paste a JWK Set, JWS, or JWE token above to begin inspection.
About the JWK Inspector
The JWK Inspector lets you decode and analyze JSON Web Key (JWK) sets, JSON Web Signature (JWS) tokens — including JWTs — and JSON Web Encryption (JWE) tokens. Auto-detection identifies the format from the input. All processing is done entirely in your browser; no data is transmitted.
- JWK Set — displays each key's type, usage, algorithm, key ID, and a human description.
- JWS / JWT — decodes the header and payload, annotates standard claims (exp, iat, sub, iss), and flags security warnings such as
alg=noneor expired tokens. - JWE — labels all five compact-serialization parts. Decryption is out of scope as it requires the private key.