JWT Inspector is a Chrome extension which makes it easy to inspect the content of any JWT bearer token sent by a webapp.
The extension adds a new JWT tab in Chrome's Developer Tools.
When the tab is open, the extension inspects all server requests and picks out
the token from any request which has an Authorization header containing a JWT
bearer token.
You can install the extension from chrome web store or read more on bugjam.github.io/jwt-inspector/.
The main implementation file is jwt-panel.js.
You can install the extension as "unpacked" straight from the source directory to directly test any changes you make. (Enable "Developer mode" in chrome://extensions/ to make this option available.)
Running build.sh packages the extension for upload to the chrome web store.
Don't forget to change the version number in manifest.json before creating the package.