Open your editor and create a file named
Running a JS program from the command line is handled by NodeJS. Start by installing NodeJS on local machine if necessary.
- Install Node.js
Now simply open the command line in the same directory as the
index.js script you created (VS Code will do this automatically with the integrated terminal).
node . // or node index.js
defer option, which will execute the JS after the HTML file is finished loading.
Run a script from an HTML file
<html> <head> <script defer src="./index.js"></script> </head> </html>
Now simply open this HTML file on your local machine and open the developer console (next step) to see the output.
Inspect the Browser Console
In Chrome, you can open the developer console with
Ctrl+Shift+J (Windows) or
Ctrl+Option+J (Mac), or manually from the settings menu by selecting More Tools -> Developer Tools. The console allows you to run code in the browser, similar to how
It is worth mentioning that frameworks like React, Angular, Svelte, etc will take care of the building & running of your app automatically and provide framework-specific tooling and steps for running code. In the real world, you are more likely to use the tooling provided by the framework to run your code, as opposed to the basic methods shown in this couse.
This course uses StackBlitz to run JS code examples in an isolated sandbox in the browser. This is a great option for sharing quick demos and issue reproductions 💡.