JWT Token Builder

Build JWT tokens visually with custom header and payload claims. Sign with HMAC-SHA256 using the Web Crypto API. Decode existing tokens. All processing happens client-side.

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HEADER

PAYLOAD CLAIMS

SIGNING SECRET

Your secret key stays in your browser and is never transmitted.

How to Use the JWT Token Builder

  1. Add your payload claims using the visual editor with key, value, and type.
  2. Enter your HMAC secret key for signing.
  3. Click Generate Token to create a signed JWT.
  4. Switch to the Decode tab to inspect any existing JWT token.

Features

  • Visual claim editor with type support (string, number, boolean)
  • HMAC-SHA256 signing via Web Crypto API
  • Token decoder with header and payload inspection
  • Pre-populated with common claims (sub, iat, exp)
  • 100% client-side -- secret key never leaves your browser

Disclaimer:This tool is provided “as is” for informational and educational purposes only. Results may not be 100% accurate. ToolBird makes no warranties, express or implied, regarding the accuracy, reliability, or completeness of any output generated by this tool. This tool does not constitute professional, legal, financial, medical, or tax advice. Always consult a qualified professional for important decisions. By using this tool, you agree that ToolBird and its operators shall not be held liable for any damages, losses, or consequences arising from the use of this tool or reliance on its results. All processing occurs in your browser — we do not store, transmit, or access your data. Use at your own risk.