JWT Decoder & Analyzer
Suggested by @maayavicoderToken Claims Decoding
Deconstruct JSON Web Tokens (JWT) into their three primary components: Header, Payload claims, and Signature block, according to RFC 7519 standards.
Validation Warnings
Inspect validation states automatically. The analyzer flags expired tokens, algorithms like 'none', or invalid base64 encoding sequences instantly.
Local Browser Sandbox
Perform all operations strictly inside your local browser memory space. Your private API session tokens are never shared or sent to any server.
How to Use the JWT Decoder & Analyzer
Paste Token
Copy and paste your encoded JWT token string (separated by dots) into the token input workspace.
Read Header
Unpack the parsed Header parameters (such as 'alg' algorithm metadata and 'typ' token indicators).
Analyze Claims
Inspect decoded JSON payload parameters (including 'sub' subject, 'iss' issuer, and 'exp' expiration times).
Check Integrity
Check indicators for token expiry, validation alerts, and signature verifiability messages.
Technical Specification Matrix
| Claim Key | Standard Definition | Validation Type | Requirement Level |
|---|---|---|---|
| exp | Expiration Time (Epoch timestamp indicator) | Time Bounds Check | Highly Recommended (Prevents perpetual tokens) |
| iss / sub | Issuer identity / Subject identifier (User UUID) | String Exact Match | Standard OAuth payloads |
| nbf / iat | Not Before validation time / Issued At creation time | Time Bounds Check | Optional context records |