JavaScript Client Library

The JS Client Library provides an interface to all of OctoPrint’s API, including the SockJS based socket to send push messages from the server to connected clients. It is available as packed web asset file at /static/webassets/packed_client.js or as individual component files at /static/js/app/client/<component>.js relative to your OctoPrint instance’s base URL (e.g. http://octopi.local/static/webassets/packed_client.js).

If you are using it from a web page hosted on OctoPrint as a Jinja2 template, you should use one of the following methods to embed it instead of manually entering the URL, in order to have OctoPrint take care of setting the correct URL prefix:

  full client library or all individual files, depending
  on the server mode - should be the preferred variant
{% assets "js_client" %}<script type="text/javascript" src="{{ ASSET_URL }}"></script>{% endassets %}

  full client library
<script type="text/javascript" src="{{ url_for("static", filename="webassets/packed_client.js") }}"></script>

  individual components (do not forget base!)
<script type="text/javascript" src="{{ url_for("static", filename="js/app/client/<component>.js") }}"></script>

Regardless of which way you use to include the library, you’ll also need to make sure you included JQuery and lodash, because the library depends on those to be available (as $ and _). You can embed those like this:

<script src="{{ url_for("static", filename="js/lib/jquery/jquery.min.js") }}"></script>
<script src="{{ url_for("static", filename="js/lib/lodash.min.js") }}"></script>

Note that all components depend on the base component to be present, so if you are only including a select number of components, make sure to at the very least include that one to be able to utilize the client.

See also

A plugin that disables anonymous access to the regular OctoPrint UI by implementing a custom UI. Utilizes the client library’s browser component to login the user.