JWT Decoder & Inspector

JSON Web Tokens (JWT) are an open standard for securely transmitting information between parties as JSON objects. Our free online JWT decoder tool lets you decode and inspect JWT tokens with complete privacy - all processing happens in your browser, so your tokens never leave your device. Easily analyze header information, payload claims, verify signature structure, and check token expiration dates without server-side processing. Perfect for developers debugging authentication systems, API security, troubleshooting token-related issues, or inspecting token claims for authorization. This tool helps you understand token structures, verification methods, and expiration timing across different authentication implementations, making it essential for API development and debugging.

How to Use

1. Paste your JWT token into the input field
2. Click the "Decode JWT" button to analyze the token
3. View the decoded header, payload, and signature

Note: This tool only decodes JWTs and does not validate signatures. For security-critical applications, always verify JWT signatures on the server side.