JWT Decoder & Token Inspector
Decode JSON Web Tokens locally in your browser. Inspect header algorithm, payload claims, and expiration date with 100% privacy.
Methodology & standardsRuns on your device
Inputs
Results update liveToken is Active (Valid)— Expires: 12/30/2030, 11:50:22 PM
Decoded client-side only
HEADER: Algorithm & Token Type
{
"alg": "HS256",
"typ": "JWT"
}SIGNATURE
sample_mock_signature_only
PAYLOAD: Claims & Data
{
"sub": "1234567890",
"name": "Alex Morgan",
"role": "admin",
"email": "[email protected]",
"iat": 1516239022,
"exp": 1924905022
}FAQ
Frequently asked questions
How the calculation works and where its limits are.
What is a JSON Web Token (JWT)?
A JWT is a compact, URL-safe token format consisting of three base64url-encoded parts separated by dots: Header (algorithm & token type), Payload (claims like user ID, roles, and expiry), and Signature.
Is this JWT decoder secure?
Yes. This decoder operates 100% locally in your web browser. Your auth tokens are never transmitted over the internet or logged to any server.
What do the standard JWT claims mean?
`exp` is the expiration timestamp (in UNIX seconds), `iat` is the issued-at time, `nbf` is not-before time, `sub` is the subject identifier, and `iss` is the token issuer.