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JWT Decoder & Verification Studio

Decode, inspect claims, check expiration status, verify HMAC SHA-256 signatures, and build custom JSON Web Tokens online.

Decode & Verify JSON Web Tokens Online

Paste any JWT token to inspect color-coded header parameters (Algorithm, Token Type), payload claims (Subject, Expiration, Issued At), verify HMAC signatures with your secret key, and check live expiration countdowns.

HEADER HS256
PAYLOAD (CLAIMS) 0 claims
Paste a JWT token to decode and verify.

What is a JSON Web Token (JWT)?

JSON Web Tokens (JWTs) are an open RFC 7519 standard for securely transmitting information between parties as a JSON object. A JWT consists of three dot-separated parts: a Header (specifying algorithm & token type), a Payload (containing user identity and claims), and a Signature (verifying authenticity).

How to use it

  1. Paste your encoded JWT string into the input area.
  2. Inspect the color-coded Header and Payload JSON cards.
  3. Check the Expiration Badge to see if the token is valid or expired.
  4. Enter your HMAC secret key to verify the cryptographic Signature.

Frequently Asked Questions (FAQ)

Is it safe to paste JWT tokens into this decoder?

Yes. All decoding, Base64Url parsing, timestamp calculations, and HMAC SHA-256 signature verifications happen 100% client-side inside your browser. No tokens or secrets are ever sent to a server.

What are standard registered JWT claims?

Standard claims include iss (Issuer), sub (Subject), aud (Audience), exp (Expiration Time), nbf (Not Before), iat (Issued At), and jti (JWT ID).

Can I decode expired tokens?

Yes. The payload data of an expired JWT remains readable; the decoder will highlight the expiration badge in red with the exact expired timestamp.

SEO & Web Development Applications

Debugging JWT tokens ensures seamless web application authentication, OAuth 2.0 / OpenID Connect authorization flows, and secure microservice API communication.

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