JWT Debugger Online
Free online JWT Debugger tool. Debug JWT tokens with detailed error analysis. 100% browser-based, no uploads required. Debug and decode JWT tokens instantly.
What Is This?
JSON Web Tokens (JWT) are the standard for authentication and information exchange. Our free online JWT Debugger helps developers, security engineers, and API integrators quickly inspect and debug JWT tokens directly in their browser. Whether you are implementing authentication, debugging authorization issues, or verifying token integrity, this tool handles all JWT formats with ease. Simply paste your token, select the appropriate option, and get the result instantly. All processing happens client-side — your data never leaves your device.
How to Use
Paste your JWT token
Copy your JWT token and paste it into the input field. The tool accepts standard JWT format with three base64-encoded segments.
Click the Debugger button
Click the 'Debugger' button to process your token. The result appears instantly with decoded payload and header.
Review the contents
Examine the decoded header, payload, and signature information. Use the insights for debugging and verification.
Examples
Free JWT Debugger with no sign-up required
Instant token inspection with decoded payload
100% browser-based — your data never leaves your device
Supports HS256, RS256, and ES256 signing algorithms
Copy decoded data to clipboard with a single click
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Frequently Asked Questions
What is JWT Debugger?
JWT Debugger refers to the process of inspecting, decoding, and debugging JSON Web Tokens to verify their contents and integrity.
Is my token safe?
Yes, all processing happens entirely in your browser. Your token data never leaves your device, ensuring complete security.
Can I verify token signatures?
Yes, the tool supports signature verification for common algorithms including HMAC, RSA, and ECDSA.
What JWT formats are supported?
The tool supports standard JWT tokens with decoded header, payload, and signature inspection for all registered claim types.