Hello, Node

Part of the Node.js Basics section of Coddy's Node.js journey. Lesson 1 of 24.

So far your JavaScript has run in a browser tab. Node.js runs the same language on a computer or a server, with no browser around it.

A Node program is a .js file. The command node weather.js runs this one, top to bottom:

const city = 'Lisbon';
console.log('Weather for ' + city);
console.log('Sunny, 24 degrees');

Each console.log prints one line in the terminal. There is no page, so document and window do not exist here. Everything else you know about JavaScript works.

In this section you build notes.js, a tool that keeps your notes in a file.

Challenge

Easy

Make notes.js print two lines:

My Notes
0 notes

Press Run. The terminal beside your code runs node notes.js and shows what it printed.

Try it yourself

// Your notes tool starts here.
console.log('Hello, Node!');

All lessons in Node.js Basics

1Running JavaScript on Node

Hello, NodeCommand-Line Arguments Commands

Errors and Exit Codes

Environment Variables

4Asynchronous Node

Callbacks Promises

Async and Await Promise.all

The Event Loop Timers

2Modules

5Events, Input and Packages

Event Emitters Reading Input

package.json

3Files

Reading a File Writing a File

Removing a Note

Handling Errors

6Project: Search and Tags