Decode, inspect, and debug JWT tokens in real-time. Analyze payload claims, expiration timestamps, and algorithms with absolute privacy.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "usr_9a123456",
"name": "Alex Vanderbilt",
"email": "alex@example.com",
"role": "admin",
"iat": 1704067200,
"exp": 1924988800
}JSON Web Tokens (JWT) are a foundational pillar of modern cloud architecture, OAuth 2.0 authorization, OpenID Connect authentication, and microservice identity propagation. Instead of storing session states inside server memory or distributed databases like Redis, a JWT encapsulates claims within a compact, cryptographically verifiable token string.
| Claim | Full Name | Type | Description |
|---|---|---|---|
| sub | Subject | String | Unique identifier of the authenticated user or entity |
| exp | Expiration Time | NumericDate (Epoch) | Time after which token must be rejected |
| iat | Issued At | NumericDate (Epoch) | Time the token was generated by the auth server |
| iss | Issuer | String (URL/URI) | Identifies who created the token (e.g. auth0.com) |
| aud | Audience | String or Array | Intended recipient API service |
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