Intro to Node Intro to npm

Learning objective: By the end of this lesson, students will understand the role of Node Package Manager (npm) in Node development.

Introduction to npm

Node Package Manager (npm) is an indispensable tool in the Node ecosystem, primarily used for installing and managing dependencies in Node apps.

What is npm?

npm is a package manager for Node. It’s a command-line utility that aids in setting up, managing, and maintaining Node projects, but it is also more. On the command line, npm is used to:

1. Initialize Node projects: npm is used to start new Node projects.
2. Install packages: npm lets you install third-party packages and libraries into your Node project. It handles the installation of local dependencies (specific to a project) and global dependencies (available across all Node projects on a system).
3. Manage dependencies: npm manages the versions of various packages your project depends on, ensuring compatibility and functionality.

The npm ecosystem

npm is not just a command-line tool but also an extensive library of external code packages available at npmjs.com, the public registry for Node packages.

What does npmjs.com offer?

npm hosts over 1.3 million Node packages in their registry.

These are applications that other developers have written and published to npm. Many kinds of apps are available, from small utilities to massive frameworks. Here are a couple of examples:

• validator: Used to help validate string data. For example, it can be used to confirm that a string is formatted as a email address.
• Express: Facilitates the creation of web servers.

npm is not just for installing external packages; it’s also a platform for publishing your own packages to contribute back to the Node community.

📚 A software registry is a centralized service that stores packages, libraries, or modules, allowing developers to publish, share, and access reusable code components.