JWT Verifier

Verify HMAC-signed JWTs (HS256/384/512) against a shared secret. Comparison is constant-time.

Token

Secret

Algorithm

Verification

Enter a token and secret to verify.

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}