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What is Node.js?
Node.js is a free program that lets computers run JavaScript code outside a web browser.
- Category GitHub & code
- Also called NodeJS
- Updated 20 Oct 2026
Node.js, explained simply
JavaScript is the language websites use. Node.js lets you use it for tools and apps on your own computer.
Many command-line tools are built with it. If a guide says you need Node, you install it once.
It comes with npm, a tool for downloading add-ons.
For example, you might install Node, then run a single command to start a tool.
On ITG Now, our free tool guides tell you when a tool needs Node.js and how to check that it is installed.
Related terms
npmPythonPackage managerCLIDependency
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Questions people ask about Node.js
Is Node.js free?
Yes. Node.js is free and open source.
Node.js vs npm: what is the difference?
Node.js runs JavaScript programs. npm downloads and manages the add-ons they use.
Do I need to learn JavaScript to use Node.js?
No. You can just install Node and run the commands from a guide.