JWT Signature Verifier (HS256, RS256, ES256, PS256)
NewVerify a JWT signature in your browser with a secret, PEM public key, JWK or JWKS. Supports HS, RS, PS and ES algorithms through WebCrypto.
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Verification uses the Web Crypto API in your browser; tokens and keys are never uploaded.
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Frequently Asked Questions
Is it safe to paste my secret?
Verification runs locally with WebCrypto and nothing is transmitted, but avoid pasting production secrets into any website; use test keys where possible.
Which algorithms are supported?
HS256/384/512, RS256/384/512, PS256/384/512 and ES256/384/512.
What key formats can I use?
A shared secret for HS*, or a PEM public key, JWK or JWKS for asymmetric algorithms.
Does it check exp and nbf?
It verifies the signature and shows the claims; check expiry and audience in your application too.