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JWT Debugger
Decode and debug JSON Web Tokens. This tool runs 100% locally in your browser.
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Header
// Header data will appear here
Payload
// Payload data will appear here
Note: This tool only decodes the token client-side. It does not verify signatures.
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What is JWT Debugger?
Decode and inspect JSON Web Tokens (JWTs). See the header, payload, and signature status instantly.
Essential for debugging authentication flow in web apps. We function just like jwt.io.
When to Use This Tool
- 1Debugging login issues
- 2Inspecting token claims (roles, expiry)
- 3Verifying token structure
Examples
Input
eyJhbGciOi...
Result
Header: HS256, Payload: {sub: '123'}
Frequently Asked Questions
Do you check validity?
We decode the token so you can see the contents. To verify the signature, you would need the secret key (which you should not paste here if possible).
Privacy & Security
Privacy is our priority. Unlike many other online tools, ToolsHub doesn't upload your data to any server. Whether you're processing sensitive text, calculating financial data, or generating passwords, everything stays in your browser.