How to run Javascript in Visual Studio Code?

To be able to run javascript in Visual Studio Code, we need to have installed NodeJS on our system and have a Javascript file created with some content.

Before being able to run Javascript on Visual Studio Code, we need to install Visual Studio Code and NodeJS. Visual Studio Code is the IDE (Integrated Development Environment) we will be using throughout the article and NodeJS is the engine that allows Javascript to run locally.

Installing Visual Studio Code

• Go to https://code.visualstudio.com/
• Download installer
• Run the installer
• Accept terms and conditions and next, next, next...

Visual Studio Code is ready to be used, but we still need NodeJs to run Javascript locally

Check if NodeJS is installed already and the version

• Open command prompt

  • Start menu (Finder if you are using mac).
  • Write cmd (Terminal if you are using mac).
  • And open it.

• Type on the command windows node -v

If NodeJS is present in the system, you´ll see something like v16.51.1 being that the installed version of Node (It could be other version, no worries).

Installing NodeJs

• Go to https://nodejs.org

• Download the recommended version.

• Run the installer.

• Accept terms and conditions and next, next, next...

Now that we have NodeJS installed on our system, we can run Javascript locally and Visual Studio Code as our IDE, but how to run Javascript on Visual Studio Code?

Let´s set up our Javascript project

• Start Visual Studio Code.

• Open a new Terminal.

• Write on the terminal npm init -y.

• npm stands for Node Package Manager

• init is the keyword for NodeJs to create a new project.

• -y is to pass as a default all values.

• If successful, a package.json file will be created on your project folder.

• Right click on the file explorer (where the package.json is displayed) and select new file.

• We are naming it app.js (js is a Javascript extension).

• Now let´s write some Javascript code on our app.js file.

• Go on, write on the terminal:

$ node app

Remember to take out the "

quot;

And you´ll see on the terminal the console.log() message displayed.

Still, I prefer to do it another way, since it allows for a more robust and personalized way to run our app.js file.

Remember the package.json we created with npm init -y? Well, we are editing now. We will make that, every time we type npm run start on the Visual Studio terminal, it´ll execute our app.js file.

• Select package.json to edit it.

• Add

	"start" : "node app.js"

Careful! We added a , at the end of line 7, if the , is missing, the JSON format is not correct and will throw errors / won´t work.

Now, we can run our Javascript project like this:

npm run start