Run React Buid In Using Pm2

Introduction to React Build and PM2

If you are a React developer, you are probably using a variety of tools and technologies to build and deploy your applications. One such tool is PM2, which is a process manager for Node.js applications. PM2 allows you to easily run your React builds and manage your application processes. In this article, we will give you an introduction to React build and PM2, and show you how you can use these tools together to improve your development workflow.

Understanding the PM2 Process Manager

The PM2 Process Manager is a popular process manager used to manage Node.js applications in production environments. It provides various features such as load balancing, process monitoring, automatic restarts, and many more. Understanding the basics of how PM2 works is important to optimize the performance of Node.js applications.

With PM2, you can easily start, stop, and restart your application processes. You can also monitor the status of your processes, view their log files, and manage environment variables. Additionally, PM2 provides some advanced features like hot reload, memory limit enforcement, and cluster mode, which can improve the performance and stability of your application.

One of the best features of PM2 is that it can be easily integrated with deployment processes. It offers various deployment options such as Git Integration, module API, and JSON Configuration, which can easily be automated using deployment tools like Capistrano, Fabric, or Ansible.

Overall, PM2 is a reliable and easy-to-use process manager, loaded with features that can help developers manage their Node.js applications in production environments with ease.

Setting up a React Project for Production

Once you have developed your React application and it is ready for production, there are a few steps you need to take to ensure that your application is optimized for performance and scalability. Here are the steps to set up a React project for production:

  1. Optimize your code: Use tools like webpack or Parcel to bundle your JavaScript and CSS files, and minify your code to reduce its size. This will ensure faster load times for your application.
  2. Configure your environment: Set up environment variables for your production environment, such as API keys, database credentials, and other configuration settings. This will make it easier to deploy your application to multiple environments.
  3. Use a web server: Serve your application using a web server like Nginx or Apache, which can handle high traffic and provide load balancing and caching features.
  4. Deploy your application: Use a deployment tool like PM2, Docker, or AWS Elastic Beanstalk to deploy your application to your production environment.

By following these steps, you can ensure that your React application is ready for production and can handle high traffic and user demands.

Build Optimization Techniques for React using PM2

PM2 is a process manager for Node.js applications. It provides many useful features like automatic restart on error, load balancing, and more. In this article, we will discuss how to use PM2 to optimize the build process for a React application.

The build process is an important step in any React project. It compiles the code, bundles the assets, and prepares the application for deployment. However, it can be a time-consuming process, especially for large projects. Fortunately, PM2 can help to speed up the build process and improve the overall performance of your React application.

One way to optimize the build process is to use PM2’s cluster mode. Cluster mode allows you to run multiple instances of the build process in parallel, which can significantly reduce the build time. To do this, you can use the following command:

pm2 start npm --name "build" -- run build --watch

This command will start a PM2 process called “build” that runs the “npm run build” command with the “–watch” option. The “–watch” option enables PM2 to monitor changes to the source code and automatically restart the build process whenever a change is detected.

Another way to optimize the build process is to use PM2’s built-in load balancing. Load balancing distributes the build process across multiple CPU cores, which can further reduce the build time. To enable load balancing, you can use the following command:

pm2 start npm --name "build" -- run build -i max

This command will start a PM2 process called “build” that runs the “npm run build” command with the “-i max” option. The “-i max” option tells PM2 to use the maximum number of CPU cores for load balancing.

In conclusion, PM2 can be a powerful tool for optimizing the build process for a React application. By using PM2’s cluster mode and load balancing, you can significantly reduce the build time and improve the overall performance of your application.

Deploying React Build using PM2 for High Availability

When it comes to deploying a React app, PM2 is an excellent tool to manage the application process. PM2 is a production process manager that helps run Node.js applications in a cluster mode, which increases the application’s availability by ensuring that the app is always running, even if one or more processes fail.

Here are the steps to deploy your React build using PM2 for high availability:

1. Install PM2: First, you need to install PM2 globally on your server by running the command:

npm install pm2 -g

2. Build your React app: Once PM2 is installed, build your React app using the command:

npm run build

3. Start your server with PM2: Once you have built your app, you can start it using PM2 with the command:

pm2 start npm --name "app-name" -- start

Replace “app-name” with your application’s name.

4. Set up process monitoring: To ensure that your app stays up and running, you need to set up PM2 to monitor the process and automatically restart your app if it fails. You can do this by running the command:

pm2 startup

This command will generate a command that you need to run with sudo privileges. Once you have run this command, PM2 will start automatically with your server.

5. Scale your application: Once your app is running, you can add more instances to the PM2 cluster using the following command:

pm2 scale app-name

This will add more instances of your app to the cluster, increasing its availability and throughput.

Using PM2 to deploy your React app is an effective way to ensure high availability and scalability. By managing your app’s processes and setting up automatic restarts, you can keep your app running at all times and minimize downtime.

Monitoring and Logging Techniques with PM2 for React Build

When it comes to building modern web applications, using React is a popular choice among developers. And when it comes to managing the build process, PM2 is a popular option as well. PM2 is an advanced process manager that helps you keep your Node.js applications running smoothly and also provides monitoring and logging capabilities.

Here are some of the techniques you can use with PM2 for monitoring and logging your React build:

Process Monitoring

PM2 provides real-time monitoring of your application’s CPU, memory usage, and other key performance metrics. You can view this information in the PM2 dashboard, which is accessible via a web interface or command line. This dashboard also allows you to start, stop, and restart your application, as well as view logs generated by PM2.


PM2 provides robust logging capabilities for your application, including the ability to stream logs in real time and save them to disk. You can configure PM2 to log your application’s output to a specific file or files, and you can also set up log rotation to manage log files over time.


In addition to monitoring and logging, PM2 can also send alerts when certain events occur. For example, you can configure PM2 to send an alert if your application crashes or if CPU usage exceeds a certain threshold.


Using PM2 for your React build can provide you with valuable monitoring and logging capabilities, as well as help you manage your application’s processes more efficiently. By using these techniques, you can gain deeper insights into your application’s performance and troubleshoot issues as they arise.

Troubleshooting Common Errors while Running React Build with PM2

If you are facing some errors while running React Build with PM2, don’t worry! Below are some of the common errors and their probable solutions:

  • Error: ENOENT: no such file or directory, open ‘/path/to/file’
    • Solution: Check if the filename/path mentioned is correct. Often, typos can cause this error. If the file or directory is missing, create it manually or run the command again to create it.
  • Error: EADDRINUSE: address already in use :::3000
    • Solution: This error occurs when the port is already in use. You can check which process is using the port and terminate it using the command – lsof -i :. Replace the <port-number> with the port number that is in use. Once you identify the process, kill it using the command – kill -9 <process-id>.
  • Error: WebSocket is not in the OPEN state
    • Solution: This error usually occurs when the connection between the client and server is lost. You can try restarting the server and client to resolve this issue.

By following the above solutions, you can easily resolve the common errors that occur while running React Build with PM2.

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