Write your first API Test using JavaScript

2 min readOct 16, 2020

In this post, we’ll take a look at what tools/technologies do we need for writing API tests using JavaScript and then we’ll also write our first API test. So let’s get started…

⚙️ Dependencies:

First off, we’ll need to get the following dependencies installed to set up our base framework -

Node JS and NPM (to install the packages below)
Mocha JS (for test framework)
Chai JS (for assertions)
SuperTest (for making API calls)
Babel (to use ES6+ in our tests)

Note: the above libraries/frameworks are optional to use, you can replace any one or all of them to meet your desired goals.

📁 Setup your project:

You can watch the installation video below to see how to install all of these packages and get your project setup.

✍️ Write API Test:

Once you have your project setup, we will begin to write our API test in the users.js file (created as part of the installation video above).

import supertest from 'supertest';
const request = supertest('https://gorest.co.in/public-api/');import { expect } from 'chai';// watch the installation video to create your token
const TOKEN = {your_token_here}describe('Users', () => {
  it('GET /users', (done) => {
    // make a GET call to the users api
    request.get(`users?access-token=${TOKEN}`).end((err, res) => {
      // assertion to ensure data is not empty
      expect(res.body.data).to.not.be.empty;
      // done callback to handle async calls
      done();
    });
  });
});

🏃‍♂️ Run your test:

Now, its time to run your test, you can do that by running the mocha command or doing npm test which will also run the same mocha command if you followed the installation video.