User Registration with REST

Question

How do you register a user account via REST in Drupal 8?

Here's how far I've made it (not sure if this is the right direction though):

I've enabled the Form mode resource under admin/config/services/rest for POST, cookie authentication, and hal_json and json formats. I then make a call to the site:

POST: http://localhost/d8/entity/entity_form_mode
Content-type: application/hal+json
Accept: application/json

The JSON to POST will start something like this:

{"_links":{}}

It will of course be filled in with various properties and values. What are these properties and values though? I've tried many combinations, and the furthest I've got is the server responding with this:

{"error":"Entity type parameter must be included in context."}

Answer 1

This now works in Drupal 8.3-x-dev. This is an example to do it from Angular:

  /*
   * Register new User.
   */
  register: function (email, password) {

    var defer = $q.defer();

    $http({
      method: 'POST',
      url: config.endpoint + '/user/register',
      dataType: 'json',
      data: {
        'name': {
          'value': email,
        },
        'mail': {
          'value': email,
        },
        'pass': {
          'value': password,
        }
      },
    })
      .success(function (data, status, headers, config) {
        defer.resolve(data);
      })
      .error(function (data, status, headers, config) {
        defer.reject(data);
      });

    return defer.promise;
  }

Make sure you enable the resource to enable user registration (I use the REST UI module).

The last step is enabling the permissions on this resource:

Now you are all set!

Answer 2

Not yet. =(

There is an open "Major" feature request for this:

• #2291055 Create a Resource for user registration so that anonymous users can register

It's currently in Drupal 8.2.x-dev, which is scheduled to be released as a beta in Aug 2016, and stable in Oct 2016.

From the issue summary: "A workaround would be to login as an admin and create a user the regular way."