Developer Tools tool
JWT Decoder
Decode and inspect JSON Web Token headers and payloads without sending them to a server.
Decode JWT tokens to inspect headers and payloads without sending them to a server. Free, private, browser-based JWT decoder.
Your token is decoded entirely in the browser and is never sent to any server.
Why people use this tool
JWT Decoder lets you paste a JSON Web Token and instantly see the decoded header and payload, which is useful for debugging authentication flows and API integrations.
- Inspect JWT claims like expiration time, issuer, and user roles during development.
- Debug authentication issues by examining token payloads from APIs.
- Verify token structure before sending it to a backend service.
How to use it
- 1Paste a JWT token (the eyJ... string) into the input area.
- 2Review the decoded header (algorithm, type) and payload (claims, expiration).
- 3Copy the decoded JSON for documentation or debugging.
FAQ
Helpful answersWhat is a JWT?
A JSON Web Token (JWT) is a compact token format used for authentication and authorization. It contains a header, payload, and signature separated by dots.
Does this tool verify the JWT signature?
No. This tool decodes and displays the header and payload. Signature verification requires the secret key, which should not be shared in a browser tool.
Is my token safe?
Yes. The token is decoded entirely in your browser and is never transmitted to any server.