Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

Node.js v25.1.0 Other versions 25.x 24.x 23.x 22.x LTS 21.x 20.x LTS 19.x 18.x 17.x 16.x 15.x 14.x 13.x 12.x 11.x 10.x 9.x 8.x 7.x 6.x 5.x 4.x 0.12.x 0.10.x Options View on single page View …

Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

An example of a web server written with Node.js which responds with 'Hello, World!': Commands in this document start with $ or > to replicate how they would appear in a user's terminal.

Now, you can use the --env-file flag to specify an environment file when running your Node.js application. Here's an example .env file and how to access its variables using process.env.

Node.js v22 empowers applications to seamlessly interact with WebSocket servers as clients, but the creation of WebSocket servers within Node.js remains dependent on established libraries.

The node:trace_events module provides a mechanism to centralize tracing information generated by V8, Node.js core, and userspace code. Tracing can be enabled with the --trace-event …

Let's walk through a simple example to demonstrate how code coverage works in Node.js. Note: This example, and all other ones in this file, are written using CommonJS.