JWT Inspector & Verifier

SubtleCrypto Verifier

Inspect JSON Web Tokens, evaluate claims, track expiration validity, and verify HMAC signatures locally via Web Crypto Subtle without transmitting credentials.

Client-Side Cryptography: JWTs and secrets never leave your browser

Encoded JWT Token

HMAC Signature Verification

Decoded (Signature Unverified)

Active / Valid Exp

Header:

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

Payload Claims:

{
  "sub": "usr-9982",
  "name": "Alex Chen",
  "role": "admin",
  "iss": "auth.platform.io",
  "exp": 1999999999,
  "iat": 1680000000
}