How to deploy nodejs with npm

As Node.js continues to develop, more and more companies and teams are beginning to use it to build various types of web applications. However, deploying Node.js applications in a real production environment is not an easy task. In this article, we will discuss how to use npm to deploy Node.js applications into production.

1. Determine the production server environment

One of the most important factors we need to consider before deploying a Node.js application is the production server environment. This means taking into account the server's operating system, processor architecture, software it's running, and more. For example, if you want to run a Node.js application on Linux, you need to ensure that the appropriate packages and components are installed.

2. Installing Node.js

Before deploying a Node.js application to a production server, we need to install Node.js on the server. You can use the curl or wget command to download the compressed package from the Node.js official website, then decompress the file and copy the file to the /usr/local/bin directory.

3. Creating a Node.js application

After writing an application using Node.js, you can use the npm tool to create a new project directory and initialize a new npm project:

mkdir myapp
cd myapp
npm init -y

4. Installing dependencies

When we create a new npm project, we need to install all the dependencies in the project. We can use the npm install command directly in the project directory to install all dependencies:

npm install --save express

5. Write startup script

In order to start the Node.js application in the production environment program, we need to write a startup script. The startup script should include the command to start the application, for example:

node app.js

The script should also include some necessary environment variables and parameters, such as port number, database connection, log level, etc.

6. Upload the application to the server

To deploy the Node.js application to the production server, we need to upload the entire project directory to the server. You can use tools such as FTP, SCP, and rsync to upload the project directory to the server. You can also use a version control system such as git to upload the project to the git server and clone the project on the server.

7. Install pm2

In a production environment, we recommend using pm2, a popular process management tool to manage and monitor Node.js applications. pm2 can run the Node.js application as a daemon process and automatically restart the application to ensure the stability of the application.

Install pm2 through npm:

npm install -g pm2

8. Start the application

Before using pm2 to start the application, we need to write a pm2 configuration file first, For example:

{
  "name": "myapp",
  "script": "app.js",
  "interpreter": "node",
  "args": ["--port", "3000"],
  "watch": true,
  "ignore_watch": ["node_modules"]
}

The configuration file is used to tell pm2 how to start and manage applications. We can then start the application using pm2:

pm2 start app.js

9. Monitoring and updating the application

Once the application is running in the production environment, we need to monitor its status and renewed on time. We can use pm2’s built-in commands to monitor and update applications. For example, use the pm2 logs command to view the application's logs:

pm2 logs myapp

Use the pm2 list command to view the started application:

pm2 list

Use the pm2 reload command to update the application:

pm2 reload myapp

In addition to pm2, there are other popular process management tools, such as forever, supervisor, etc.

Summary

In this article, we discussed how to use npm to deploy Node.js applications into a production environment. From installing Node.js to creating the application and uploading to the server, to using pm2 for management and monitoring, these steps are necessary to deploy a Node.js application. In practice, specific configuration may also be required to adapt to the requirements of the production environment. Hopefully this article helped you better understand how to deploy Node.js applications into production.

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