How to use JWT Viewer
- Drop your JWT into the field at the top of JWT Viewer.
- Watch the output update instantly while you adjust the JWT.
- Finish by choosing Copy to take the output with you.
About this tool
JWT Viewer runs entirely in your browser. JWT Viewer decodes a JSON Web Token in your browser, showing the header and payload without verifying secrets remotely.
The token is parsed on your device and never transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is JWT Viewer for?
Use JWT Viewer to process your input without installing anything; everything happens client-side.
Do I need an account for JWT Viewer?
No — JWT Viewer needs no account, sign-up or installation.
Does JWT Viewer upload my data?
No — JWT Viewer processes everything locally in your browser, so nothing you enter is uploaded or stored.
Does JWT Viewer verify the JWT signature?
JWT Viewer decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Can I use JWT Viewer without a connection?
Yes — after the first load JWT Viewer runs entirely offline.