Start by adding the
raven.js script tag to your page. It should be loaded as early as possible.
<script src="https://cdn.ravenjs.com/3.26.4/raven.min.js" crossorigin="anonymous" ></script>
Next configure Raven.js to use your GlitchTip DSN:
Raven.config("your DSN here").install();
At this point, Raven is ready to capture any uncaught exception.