How to use npm to install and use foreve in nodejs

In the process of developing using Node.js, if you need to keep the application running in the background, you need to use the forever tool provided by Node.js. Here's how to use npm to install and use forever.

1. Install Node.js

If you have not installed Node.js, you can go to the official website https://nodejs.org to download the installation package and install it.

2. Install forever

Enter the following command in the terminal to install forever using npm:

npm install forever -g

This command will install the forever tool globally , if you only want to use forever in the current directory, you can omit the parameter -g.

3. Using forever

After the installation is complete, you can use forever to start the Node.js application. In the directory of the Node.js application you want to start, execute the following command:

forever start app.js

where app.js is the entry file of the Node.js application you want to start. If you need to specify startup parameters, you can add parameters at the end of the command, as follows:

forever start app.js --port=3000

In this way, you have successfully started the application and let it run in the background for a long time.

4. Other commands

In addition to startup commands, forever also provides a series of commands to manage running applications, such as:

• Stop the application

  forever stop app.js

• Restart the application

  forever restart app.js

• View the current status of the application

  forever list

5. Problems encountered and solutions

In the process of using forever, you may encounter some problems. Here are some common problems and solutions for your reference.

• An error message appears: Cannot find module 'forever'

  This error is usually caused by an error when executing npm install forever -g. You can try to install it using the sudo command. :

  sudo npm install forever -g

• The application cannot be accessed after it is started

  This problem may be caused by the incorrect port on which the application is running. You can check the prompt information when the application starts to see which port the application is running on, and then access the port in the browser.

• The application stops running

  If the application stops running, you can use the forever logs app.js command to view the application's log information and solve the problem as soon as possible.

The above are the steps to install and use forever using npm. I hope it will be helpful to everyone.

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