New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
  @service fetch;
 
		@action async formSave(input) {
      const url = 'https://ember-twiddle.com/test';

      return this.fetch.request(url, {
          method: 'patch',
          headers: {
            'Content-Type': 'application/json'
          },
          data: JSON.Stringify
        });
    }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<button {{on "click" this.formSave}}>Save</button>
<br>
{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-ajax-fetch": "1.0.0"
  }
}