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Learn to build and deploy a full-stack MERN application. Gain insights into MongoDB basics, Node.js backend, and React frontend. Explore API testing and Heroku deployment.

Beginning Node.js, Express & MongoDB Development.png

MERN.tar.gz

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In this course, you’ll learn how to build a full-stack application using the MERN stack and deploy it to the internet. The MERN stack is a popular stack of technologies that build modern Single Page Applications (SPAs).

You’ll begin with the basics of MongoDB and the process of setting it up. Next, you will go over work with the Atlas cloud database. Then, you’ll learn how to set up the backend using Node and express. Also, you’ll be creating a fully functional movie review application. After creating the controller and data access objects, you’ll learn to create routes. Next, you’ll test the created API. Finally, you’ll learn how to create the frontend using the React components and deploy the application on Heroku.

By the end of this course, you’ll learn how to connect both the backend and the frontend to create a full-stack MERN application, as well as how to deploy it.

Beginning Node.js, Express & MongoDB Development


In this lesson, we'll test to see if our Node.js back-end server can access the database. 

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


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GoJS React

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Execute the working example set above and append `/api/v1/movies` to its URL (see image below). This should return our movie results. 



The output should be similar to the image below:

If we see the output above, that means our application has successfully queried the database.
We can now test the API in our browser, but it's better to test our API with a tool called Insomnia. 

# Setting up Insomnia and testing the back-end server

Go to https://insomnia.rest/ and download the free Insomnia application, as shown below:

Let's learn how to test the Node.js back-end server.

Introduction and Setting up the Database

Setting up the Backend

Setting up the Frontend : Creating the Server

Setting up the Frontend: Creating the React Components

Deployment

Build an Image Sharing App with MERN Stack

Conclusion

Testing the Back-end API

Setting up Insomnia and testing the