jwt debugger & decoder
Debug and verify your JSON Web Tokens (JWT). Inspect headers and payloads instantly with this secure developer tool.
Token details will appear here after decoding
Getting Started in Seconds
Paste Token
Enter your encoded JWT (Header.Payload.Signature) into the input field.
Inspect Data
Review the decoded JSON for both the Header and the Payload sections.
Check Expiry
Verify the 'exp' claim to ensure the token is still valid.
Related Tools
Instantly detect your public IP address, location, ISP, and timezone information. A fast, secure, and private IP lookup tool — no data is stored or shared.
Generate unhackable passwords with custom symbols and length. Client-side generation ensures your passwords stay private.
Generate SHA-256 cryptographic hashes for your text data instantly. 100% client-side processing — your data never leaves your browser. Fast, free, and secure for developers.
Generate SHA-512 cryptographic hashes for your text data instantly. 100% client-side processing — your data never leaves your browser. Fast, free, and secure for developers.
Common
Questions
Have a different question about JWT Debugger & Decoder? Feel free to reach out or explore our other documentation.
1Ever found yourself needing to 'look inside' a secure token but were only met with a wall of encoded text?
Imagine you're trying to debug an authentication issue and have a messy JWT (JSON Web Token) that doesn't tell you why your user can't log in. Our JWT Debugger is like a digital X-ray, instantly splitting your token into its Header, Payload, and Signature. It lets you see exactly which user ID and permissions are inside, saving you from the headache of manually decoding Base64 strings, while keeping the technical details clean and organized.
2Think of this as your private audit station—how can I verify my token's expiration and user claims?
Imagine you're checking a critical production token that contains sensitive user data—you wouldn't want those secrets being sent to a third-party server. That's why our JWT tool runs 100% 'client-side.' Every bit of the decoding happens right inside your own browser window. You can check the 'iat' and 'exp' fields for total accuracy, ensuring your tokens are fresh and secure, without ever risking your developer secrets.
3Does this tool let me verify the actual cryptographic signature of the token?
Think of this as a highly skilled 'inspector' rather than a final gatekeeper. While our tool decodes the content so you can read it, true signature verification requires your server's private secret or public key. For your protection, we recommend performing the final verification on your own server. Our debugger is designed to help you *understand* the token's structure and contents first, providing the clarity you need to build more secure authentication flows.