SECURITY PROTOCOL

JWT Debugger

Securely decode, verify, and inspect JSON Web Tokens locally. Privacy-first implementation—your tokens never leave your browser.

Encoded Token
Decoded Content

Awaiting Token

Paste a token on the left to begin the decoding process.

Privacy First Security

JSON Web Tokens (JWT) often contain sensitive user Information like email addresses, roles, and IDs. Many online debuggers upload these tokens to their servers for processing, which is a major security risk.

This debugger is built to be 100% client-side. The decoding happens entirely within your browser's memory using standard JavaScript APIs. No data is logged, stored, or transmitted anywhere.

JWT Knowledge Base

Yes. Unlike some popular JWT sites, this tool runs entirely on your local machine. We do not have a backend server that receives or logs your tokens.

Currently, this tool decodes the content for inspection. Signature verification (which requires your secret or public key) is handled locally if you provide the necessary keys in a future update. For now, it's optimized for inspection.

'iat' stands for 'Issued At' (when the token was created) and 'exp' stands for 'Expiration Time' (when the token will no longer be valid). Both are Unix timestamps.

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