Security Audit JWT Tokens
Review JWTs as part of a security audit — check for weak signing algorithms, excessive token lifetimes, or sensitive data in the payload.
🔒 The token is decoded entirely in your browser. Nothing is sent to any server.
Security Audit tips
Check the `alg` field in the header. `none` or `HS256` with a short secret is a red flag; production tokens should use `RS256`, `ES256`, or stronger.
Long-lived tokens (more than a few hours for access tokens) are a security concern. Look at the gap between `iat` and `exp` to assess token lifetime.
Look at the payload — JWTs should never contain passwords, full credit card numbers, or other sensitive data. The payload is essentially plaintext (Base64URL ≠ encrypted).
The decoder runs entirely client-side, so it's safe to audit production tokens here without any data leaving your network or browser session.
কিভাবে কাজ করে
কেন আমাদেরটি?
Also check out…
Debug Authentication Issues with JWT Decoder
Inspect JWTs from your app to debug login failures
Inspect API Tokens While Testing Endpoints
Decode JWTs returned by your API to verify the rig
Inspect OAuth and OpenID Connect Tokens
Decode access tokens, ID tokens, and refresh token
Learn How JWT Tokens Work
Decode example JWTs to understand the structure: h