forever.js

Forever.js is a useful tool for ensuring that your Node.js applications stay up and running even in the event of unexpected failures. It is a command line interface utility that provides simple commands to start, stop or restart a Node.js process as well as monitor its health and report any issues.

Key Features

Some of the key features of Forever.js include:

• Graceful restarts: Forever.js can gracefully restart your Node.js processes without dropping any existing connections.

• Auto-restart: Forever.js can be configured to automatically restart your Node.js processes in the event of a crash.

• Log management: Forever.js automatically logs all output from your Node.js processes, and can also be configured to rotate or compress logs as necessary.

• OS-level monitoring: Forever.js can be configured to monitor your Node.js processes at the OS level, and can trigger a restart if your process exceeds a set memory threshold.

Getting started

Installing Forever.js

You can install Forever.js using npm, which is the package manager for Node.js. Run the following command in your terminal:

npm install forever -g

Starting a process with Forever.js

To start a new process with Forever.js, you can use the following command:

forever start app.js

This command will start your Node.js process and keep it running even if an error occurs.

Restarting a process with Forever.js

To gracefully restart a running process with Forever.js, use the following command:

forever restart app.js

Stopping a process with Forever.js

To stop a running process with Forever.js, use the following command:

forever stop app.js

Checking the status of a process with Forever.js

To check the status of a running process with Forever.js, use the following command:

forever list

Setting up auto-restart with Forever.js

You can configure Forever.js to automatically restart your Node.js processes in the event of a crash by using the -w flag:

forever start -w app.js

Conclusion

In conclusion, Forever.js is a powerful tool for ensuring that your Node.js applications stay up and running even in the case of unexpected failures. With its easy-to-use command line interface and powerful features, it is an essential tool for any Node.js developer.