nodejs install nodemon

Node.js is a JavaScript runtime environment that can run JavaScript code on the server side. It is an open source, cross-platform runtime environment that can be used to develop fast and scalable web applications, especially those that are I/O intensive. When we develop web applications using Node.js, we often need to constantly modify the code and restart the application to see the effects of the changes. At this time, if we can automatically monitor the application code and automatically restart the application when the code changes, it will greatly improve our development efficiency. nodemon is such a tool that can help us monitor the code and automatically restart the application.

This article will introduce how to install and use nodemon on Windows, Linux and macOS systems.

Install Node.js

Before installing nodemon, we must first install Node.js. The Node.js official website provides steps for installing Node.js on various operating systems. In this article, we’ll cover the steps to install Node.js on Windows, Linux, and macOS systems.

Install Node.js on Windows

The method to install Node.js on Windows is very simple. Just visit the Node.js official website, download the Windows Installer, open the installer and follow the prompts. Just do it.

Installing Node.js on Linux

There are several ways to install Node.js on Linux. This article describes the two most common methods.

Method 1: Use the distribution’s software source

Distributions such as Ubuntu and Debian include Node.js in their default software sources. You can install Node.js on Ubuntu using the following command:

sudo apt update
sudo apt install nodejs

The command to install Node.js on other Debian-based distributions is similar. After the installation is complete, you can use the following command to check whether Node.js has been successfully installed and display its version information:

node -v

Method Two: Binary distribution using NodeSource

NodeSource for multiple distributions An official binary distribution of Node.js is provided. You can use the following command to add the PPA of NodeSource in the terminal and install Node.js:

curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo apt-get install -y nodejs

After the installation is complete, you can use the following command to check whether Node.js has been successfully installed and display its version information:

node -v

Installing Node.js on macOS

There are many ways to install Node.js on macOS. This article describes the two most common methods.

Method 1: Using Homebrew

If you have already installed Homebrew, you can use the following command to install Node.js in the terminal:

brew install node

After the installation is complete, you can use The following command checks whether Node.js has been successfully installed and displays its version information:

node -v

Method 2: Use the Node.js official installer

You can visit the Node.js official website and download macOS Installer for installation program. Just open the installer and follow the prompts.

Installing nodemon

After we have successfully installed Node.js, we can start installing nodemon. In the terminal (or command line interface), use the following command to install nodemon:

npm install -g nodemon

Enter the above command in the terminal (Window) in the menu bar, or in the terminal program (macOS/Linux), and you can start Install.

The "-g" parameter in the above command means to install nodemon as a global module so that it can be used in any directory on the system. If you do not add the "-g" parameter, a partial module is installed and can only be used in applications in the current directory.

After the installation is complete, use the following command to check whether nodemon has been successfully installed and display its version information:

nodemon -v

Using nodemon

We have successfully installed nodemon, now let us Let's see how to use it.

Suppose we have an application called "app.js" that listens on port 3000. We can start the application using the following command:

node app.js

At this point, the application will start listening for connection requests on port 3000. If we modified the "app.js" file and saved the changes, at this point we need to stop the application and restart it to see the effect of the changes. In this way, our development efficiency will be greatly affected.

Now we can use nodemon to automatically detect code changes and restart the application. The application can be started using the following command:

nodemon app.js

At this point, the application will start and listen for connection requests on port 3000 as before. However, the difference is that now nodemon will automatically monitor code changes. If we modify the "app.js" file and save the changes, nodemon will restart the application so that we can immediately see the effects of the changes. In this way, our development efficiency is greatly improved.

In addition, nodemon has many other functions, such as you can specify files or folders to monitor, and you can output more detailed information in the console, etc. If you want to know more about nodemon, you can visit the nodemon official website or enter the following command in the terminal to view the nodemon help document:

nodemon --help

总结

nodemon 是一款很实用的 Node.js 模块，可以帮助我们自动监视代码更改并自动重新启动应用程序，提高我们的开发效率。本文介绍了在 Windows、Linux 和 macOS 系统上安装和使用 nodemon 的步骤。希望本文能够对您有所帮助。

The above is the detailed content of nodejs install nodemon. For more information, please follow other related articles on the PHP Chinese website!