roslibjs.getParam returns "Service /rosapi/get_param_names does not exist"

edit

Posting on behalf of coworkers so I don't have full output.

wiki.ros.org/roslibjs/Tutorials explains the usage of ros.getParams. Calling the following snippet returns undefined object.

const test = new ROSLIB.Param({
      ros: this.api,
      name: "/our_custom/custom_param"
    });
    //this.paramRefs["bolles_support_version"].get(
    test.get(
      result => {
        console.dir(result);
        if (callback) {
          callback(result);
        }
      },
      error => {
        console.dir(error);
        this.props.addAlert({
          variant: "error",
          message: error
        });
      }
    );

Calling this.api.getParams() returns:

Service /rosapi/get_param_names does not exist

On ROS "backend", there's this node running:

  <node pkg="rosbridge_server" type="rosbridge_websocket" name="rosbridge_webbridge" output="screen" respawn="true">

What is missing on our setup?