Book Image

Professional JavaScript

By : Hugo Di Francesco, Siyuan Gao, Vinicius Isola, Philip Kirkbride
Book Image

Professional JavaScript

By: Hugo Di Francesco, Siyuan Gao, Vinicius Isola, Philip Kirkbride

Overview of this book

In depth knowledge of JavaScript makes it easier to learn a variety of other frameworks, including React, Angular, and related tools and libraries. This book is designed to help you cover the core JavaScript concepts you need to build modern applications. You'll start by learning how to represent an HTML document in the Document Object Model (DOM). Then, you'll combine your knowledge of the DOM and Node.js to create a web scraper for practical situations. As you read through further lessons, you'll create a Node.js-based RESTful API using the Express library for Node.js. You'll also understand how modular designs can be used for better reusability and collaboration with multiple developers on a single project. Later lessons will guide you through building unit tests, which ensure that the core functionality of your program is not affected over time. The book will also demonstrate how constructors, async/await, and events can load your applications quickly and efficiently. Finally, you'll gain useful insights into functional programming concepts such as immutability, pure functions, and higher-order functions. By the end of this book, you'll have the skills you need to tackle any real-world JavaScript development problem using a modern JavaScript approach, both for the client and server sides.
Table of Contents (12 chapters)

4. RESTful APIs with Node.js

Activity 5: Creating an API Endpoint for a Keypad Door Lock


  1. Create a new project folder and change the directories going to it to the following:
    mkdir passcode
    cd passcode
  2. Initialize an npm project and install express, express-validator, and jwt-simple. Then, make a directory for routes:
    npm init -y
    npm install --save express express-validator jwt-simple
    mkdir routes
  3. Create a config.js file, just as you did in Exercise 21, Setting Up an Endpoint that Requires Authentication. This should contain a randomly generated secret value:
    let config = {};
    // random value below generated with command: openssl rand -base64 32
    config.secret = "cSmdV7Nh4e3gIFTO0ljJlH1f/F0ROKZR/hZfRYTSO0A=";
    module.exports = config;
  4. Make the routes/check-in.js file in order to create a check-in route. This can be copied in whole from Exercise 21, Setting Up an Endpoint that Requires Authentication:
    const express = require('express');