How to use JWT Debugger
- Start by adding the JWT you want to process into JWT Debugger.
- JWT Debugger updates the output automatically as you type.
- Finish by choosing Copy to take the output with you.
About this tool
There is no server behind JWT Debugger. JWT Debugger splits and base64url-decodes a JWT locally so you can inspect its claims.
Signature verification that needs a secret should be done in a trusted environment; JWT Debugger focuses on decoding. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is JWT Debugger for?
JWT Debugger runs entirely on your device: add your input, and it processes it locally in real time.
Do I need an account for JWT Debugger?
No — JWT Debugger needs no account, sign-up or installation.
Where is my data processed by JWT Debugger?
Entirely in your browser — JWT Debugger keeps your data on your own machine and sends nothing anywhere.
Does JWT Debugger verify the JWT signature?
JWT Debugger decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Does JWT Debugger work on mobile?
Yes — JWT Debugger is just a web page and runs on any modern browser, including phones and tablets.