100% Client-Side Sandbox · Zero Token Uploads
JWT Inspector & Debugger
Parse JSON Web Token headers & payloads locally, track token expiration in real-time, and verify HMAC SHA-256 signatures via Web Crypto API.
HMAC-SHA256 Signature Verification (Optional):
Unverified
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HEADER: Algorithm & Token Type
{}
🟣
PAYLOAD: Data Claims
{}
⏱️
Time Claims & Expiration Status:
- Expiration (exp):
- -
- Issued At (iat):
- -
- Subject (sub):
- -
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SIGNATURE: Hash Signature
-
3 Steps to Inspect JWT
Step 1:
Paste Token
Paste your raw encoded JWT string into the left input.
Step 2:
Inspect Claims
System decodes Header, Payload and checks expiration status.
Step 3:
Verify Signature
Optionally enter your secret to verify HS256 signature locally.
Frequently Asked Questions (FAQ)
Q: Can JWT encrypt sensitive passwords?
No. Standard JWT payloads are only Base64URL-encoded, not encrypted. Anyone who has the token can decode it. Never store raw passwords inside claims.
Q: Is local signature verification safe?
100% safe. Verification runs on your device's native Web Crypto API. No data packets or secrets are transmitted over the network.