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JWT Inspector & Debugger

Security & Privacy

Safely decode, format, and inspect JWT headers, payload claims, and signatures entirely within your browser memory. Check token expiration dates, issuer credentials, and custom claims offline.

100% Client-Side
Header: Algorithm & Token Type
// Invalid or missing header
Payload: Data Claims
// Invalid or missing payload
Signature (Base64Url)

// No signature segment found

Zero-Knowledge Privacy Guarantee

This JWT Inspector & Debugger executes 100% locally in your browser’s JavaScript memory using client-side Web APIs. No inputs, keys, tokens, files, or outputs are ever uploaded to any server or logged in any database.

Key Features & Capabilities

  • 100% offline client-side decoding—your secret tokens are never leaked to external servers
  • Formatted JSON visualization for header and payload claims
  • Real-time expiration (exp) and issued-at (iat) timestamp interpretation
  • Direct copy-to-clipboard actions for payload, header, or formatted claims

How to Use This Tool

  1. 1Paste your encoded JSON Web Token (e.g. eyJhbGciOi...) into the input area.
  2. 2Inspect the decoded Header and Payload sections.
  3. 3Check the live expiration status badge and claims table.

Frequently Asked Questions (FAQ)

Yes! Unlike other online JWT tools, our tool runs 100% in your browser using local JavaScript decoding. Zero network requests are made.

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