JWT Decoder, Verifier & Signer
Inspect JWT headers and claims, verify signatures and create signed tokens without exposing tokens or cryptographic keys to a server.
About JWT labFeatures & how to use
Decode JWT claims, verify JSON Web Token signatures and sign tokens locally. Secrets, private keys and tokens never leave your browser.
What it can do
- Decode compact JSON Web Tokens.
- Verify HMAC, RSA, PSS and ECDSA signatures.
- Sign tokens with local secrets or private keys.
- Import local JWK or JWKS with explicit, unambiguous key selection; no remote key lookups.
How to use it
- Choose Decode, Verify or Sign.
- Enter the token, payload and key required by the operation.
- Run the operation and inspect the local result.