How to access user data in an outlet connector hbs?

Hi,

If you mean how to log data inside a template, you can use {{log data_here}} and this should show in the browser console.

You can also use the API: api.getCurrentUser().
For example, in the HTML <head> of your theme/component:

<script type="text/discourse-plugin" version="0.8">
  console.log(api.getCurrentUser());
</script>