JWT Decoder
100% Client-Side Private — Zero Server Uploads
Decode and inspect JSON Web Tokens. View header, payload, and expiration status.
How do I use JWT Decoder?
1
Paste your JWT token into the input field.
2
Click 'Decode JWT' to parse.
3
View the decoded header, payload, and signature.
4
Check expiration status and timestamps.
What features does JWT Decoder offer?
Base64URL Decoding: Pure client-side JWT parsing.
Expiration Check: Automatically validates exp claim.
Structured Output: Header and payload as formatted JSON.
100% Private: No tokens sent to any server.
Frequently Asked Questions about JWT Decoder
Does this tool verify JWT signatures?
No. This tool decodes and inspects JWTs. Signature verification requires the signing key/secret which should never be shared in a browser tool.
Is my JWT token safe?
Yes! Decoding happens 100% in your browser. No data is transmitted to any server.
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