normalizeResponse must return a valid JSON API document:

Here is my Code:

Inside model:

import Model, { attr } from '@ember-data/model';

export default class TodoModel extends Model {

@attr('number') userId;

@attr('string') title;

@attr('boolean') completed;

}

Inside Adapter:

import RESTAdapter from '@ember-data/adapter/rest';

export default class TodoAdapter extends RESTAdapter {

host = 'https://ift.tt/JlnM9Eq';

}

Inside Serializer:

import RESTSerializer from '@ember-data/serializer/rest';

export default class TodoSerializer extends RESTSerializer {

normalizeResponse(store, primaryModelClass, payload, id, requestType) {

    payload={
        "todos":payload
    }

    return this._super(...arguments);

}

}

Inside Route:

import Route from '@ember/routing/route';

import { inject as service } from '@ember/service';

export default class HelloRoute extends Route {

@service store;

model() {

return this.store.findRecord('todo',1);

}

}

Error:

Error while processing route: hello Assertion Failed: normalizeResponse must return a valid JSON API document:

• Top level of a JSON API document must be an object Error: Assertion Failed: normalizeResponse must return a valid JSON API document:

• Top level of a JSON API document must be an object

(My point of View: The Error is coming while processing the Serializer, how to return a JSON API document from normalizeResponse function.)