JWT Decoder & Inspector

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Decode, verify claims, inspect headers, and check token expiry.

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Active: Expires in 1497d 4h (9/21/2030, 4:37:02 PM)

Sat, 21 Sep 2030 16:37:02 GMT

Encoded JWT (Base64URL)

• Header• Payload• Signature

Header (Algorithm & Token Type)

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

Payload (Claims & Metadata)

{
  "sub": "usr_9081123",
  "name": "Alex Chen",
  "email": "alex@company.com",
  "roles": [
    "admin",
    "developer"
  ],
  "iss": "https://auth.omnikite.com",
  "aud": "https://api.omnikite.com",
  "iat": 1516239022,
  "exp": 1916239022
}

Signature Verification (Web Crypto HMAC)

HMAC Secret Passphrase:

Detected RFC 7519 Standard Claims

sub: usr_9081123Subject: Identifies the principal that is the subject of the JWT (e.g., user ID).

iss: https://auth.omnikite.comIssuer: Identifies the principal that issued the JWT (e.g., auth server domain).

aud: https://api.omnikite.comAudience: Identifies the recipients that the JWT is intended for (e.g., target API).

iat: 1516239022Issued At: Identifies the time at which the JWT was issued.

exp: 1916239022Expiration Time: Identifies the expiration time on or after which the JWT MUST NOT be accepted.

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100% Zero-Upload Privacy

All computation executes exclusively inside your device memory using Web APIs and WebAssembly. No data or files ever leave your browser.

Real-Time Native Execution

Zero network roundtrips. Operates offline without sending external API requests, delivering instantaneous sub-millisecond computation.

Developer-First Architecture

Engineered with RFC standards, cryptographic primitives (Web Crypto Subtle API), and production-grade formatting libraries.

Step-by-Step: How to Use JWT Decoder & Inspector

Paste Token: Paste your JWT string (header.payload.signature) into the input box.
Inspect Header & Claims: View the decoded algorithm, issued-at timestamp, and custom payload claims.
Verify Expiry: Check if the token is currently active or expired with local system clock validation.

Frequently Asked Questions

Is it safe to paste private JWT tokens here?

Yes. Unlike other websites, Omnikite decodes tokens 100% in your local browser memory using JavaScript. No tokens or secrets are ever sent to any remote server.

Does this verify the signature?

Yes, it inspects the algorithm type and signature segment format client-side.

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