The index route will retrieve all of the contacts from the database and send them back to the client in a JSON object. We can use the mongoose .find() method to retrieve all of the entries of a model from the database.

Insert the following code into the ContactController.js file:

// ./controllers/ContactController.js

const Contact = require('../models/Contact');

module.exports = {
  async index(ctx) {
    const contacts = await Contact.find();
    ctx.body = {
      status: 'success',
      data: contacts
    };
  }
};

Next, we head over to the ./middleware/router.js file, in order to add the corresponding route, as follows:

// ./middleware/router.js
// ...
const contactController = require('../controllers/ContactController');

router
  .get('/', async ctx => (ctx.body = 'Welcome to the contacts API!'))
  .get('/contact', contactController.index);

//...

Calling the GET /contact endpoint should send a JSON object with a success status and an empty array as the data property. The data property, which is meant to hold a list of contacts, is empty, as we have not yet inserted any records into the database. An example response object can be seen as follows:

{
    "status": "success",
    "data": []
}