Ember-cli Initializer Example

example.js

// app/initializers/csrf.js

export default {
  name: 'csrf',
  initialize: function(container, app) {
    app.inject('route', 'csrf', 'service:csrf');
    app.inject('controller', 'csrf', 'service:csrf');
  }
}

// app/services/csrf.js

export default Ember.Object.extend({
  token: function() {
    // logic to fetch csrf token here
  }.property()
});

Executable example , Thank you.