About JWT Decoder & Inspector
Free online JWT decoder and inspector. Paste a JSON Web Token to instantly decode and view its header, payload, claims, and expiration status. Check token validity, inspect algorithms, and view timestamps in human-readable format. No libraries needed — pure client-side decoding.
Frequently Asked Questions
What is a JWT token?
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and information exchange. It consists of three parts: header, payload, and signature.
Can this tool verify JWT signatures?
This tool decodes and inspects JWT tokens client-side. Signature verification requires the secret key and is typically done server-side.
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Privacy: This tool runs entirely in your browser. No data is sent to any server. Your input is processed locally using JavaScript and is never stored, logged, or transmitted. Lintly.cloud does not use cookies for tracking and does not require an account.