Learn Node.js fundamentals, build modules, REST APIs, and applications using Express, Passport.js, and Socket.IO.

docker.tar.gz

Chapter 1

Chapter 2 Chapter 3.1

Chapter 3.2

Chapter 4.1

Chapter 3.3

Chapter 4.2-Postman

Chapter 5-Postman

Chapter 6.1

Chapter 2-Exercise

Chapter 4.2-Postman-copy

Chapter 5-Postman-copy

Built on Chrome’s V8 JavaScript engine, Node.js is a runtime environment that enables JavaScript to run outside the browser. This course will help you learn the fundamentals of Node.js to build portable applications.

You’ll learn about the components and build patterns of Node.js. You’ll also explore the API to learn how to create modules and write code to unique data files. Moreover, you’ll delve into the features and practices of JavaScript and build a REST API using the Express framework from scratch. This will set up authentication tokens with Passport.js and JSON web tokens, and finally build a live trivia game with Socket.IO.

By the end of this course, you’ll be equipped with the extensive knowledge to build rich and comprehensive Node.js applications running on the server with JavaScript.

Learn Node.js from Scratch

## Write to a file 

Let's implement a `writeFile()` function that asynchronously writes data to `test.txt`, replacing all existing data with new data passed to `writeFile()`.

We can write to a file with `fs.writeFile()`. This method accepts two arguments:

- It accepts a file path.
- It accepts data to be written to the file.

After writing to `test.txt` with the implemented function, check the contents of `test.txt` displayed by the `readFile()` function.

Let’s add the required code to the `file-system.js` file and see what happens:

# Write to a file 

Let's implement a `writeFile()` function that asynchronously writes data to `test.txt`, replacing all existing data with new data passed to `writeFile()`.

We can write to a file with `fs.writeFile()`. This method accepts two arguments:

- It accepts a file path.
- It accepts data to be written to the file.

After writing to `test.txt` with the implemented function, check the contents of `test.txt` displayed by the `readFile()` function.

Let’s add the required code to the `file-system.js` file and see what happens:

Before We Begin

Node.js Overview

The Node.js API

JavaScript Essentials Review

Building a RESTful API with Express

Authentication with Passport.js and JSON Web Tokens

Build a Live Trivia Game with Socket.IO

Wrap Up!

Appendix

Coding Exercise: Write to a File

Write to a file