Why install nodejs

Reasons for installation: 1. The development of Nodejs is very efficient and the code is simple; 2. Nodejs can perform asynchronous programming and has advantages in handling IO-intensive applications; 3. The NPM package management tool can be used in project development It is very convenient to install, share, distribute code, and manage project dependencies, and NPM runs on node.js.

The operating environment of this tutorial: windows7 system, nodejs version 12.19.0, DELL G3 computer.

Why should we install nodejs?

The development of Nodejs is very efficient and the code is simple, thanks to the single-thread mechanism of Nodejs. Another feature of Nodejs - asynchronous programming, gives Nodejs a clear advantage in handling IO-intensive applications.

Node.js has a great package management system NPM.

One thing that definitely shouldn’t be overlooked when discussing Node.js is support for package management using the built-in npm tool, which is installed by default on every Node.js environment. The concept of npm modules is very similar to Ruby Gems: a set of reusable components that can be easily installed through an online repository, with version and dependency management.

You can install almost any package/library by running "npm install packagename". In addition, dependencies can be tracked through the package.json file. Therefore, the Node.js library is easy to clone and running "npm install" installs all dependencies.

The complete list of packaged modules can be found on the npm website or accessed using the npm CLI tool that is automatically installed with Node.js. The module ecosystem is open to everyone, anyone can publish their own modules and the published modules will appear in the npm repository.

Some useful npm modules are:

• express - Express.js, a Node.js web development framework inspired by Sinatra, used by most Node. The de facto standard for js applications.

• hapi - A modular and very easy-to-use configuration-centric framework for building web and service applications

• connect - Connect is an extensible HTTP server framework for Node.js, which provides a series of high-performance "plug-ins" called middleware as the basis of Express.

• socket.io and sockjs – the two most common server-side components for websockets today.

• pug (formerly Jade) – One of the popular templating engines inspired by HAML, the default option in Express.js.

• mongodb and mongojs – MongoDB wrappers that provide an API for the MongoDB object database in Node.js.

• redis - Redis client.

• forever – Probably the most commonly used utility to ensure that a given node script runs continuously. Keep Node.js processes in a production state when encountering unexpected failures.

• bluebird - Full-featured Promises/A implementation with excellent performance

• moment - for parsing, validation, manipulation and formatting A lightweight JavaScript date library that converts dates.

The list keeps growing. There are many useful packages out there for everyone to use.

Advantages of Node:

As an emerging front-end framework and back-end language, Node has many attractive features:

• RESTful API

• Single-threaded

• Node can still process tasks concurrently without adding additional threads— — Node.js is single-threaded. It implements concurrent operations through the event loop, and we should make full use of this - avoid blocking operations as much as possible, and instead use non-blocking operations.

• Non-blocking IO

• V8 virtual machine

• Event driven

[Recommended learning: "nodejs tutorial"]

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