JWT Debugger & Decoder
Debug and verify your JSON Web Tokens (JWT). Inspect headers and payloads instantly with this secure developer tool.
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About JWT Debugger & Decoder
Our JWT Debugger & Decoder is an indispensable tool for developers working with modern web authentication. JSON Web Tokens (JWT) are the backbone of secure data transmission between clients and servers, but their encoded format can be difficult to inspect manually. This tool allows you to instantly decode any JWT to view its header, payload, and claims without needing a secret key. It's perfect for verifying token expiration, checking user roles, and debugging complex OAuth2 or OpenID Connect flows. T00LZ processes everything locally, ensuring your sensitive authentication tokens are never exposed to external servers.
How to Use JWT Debugger & Decoder
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.