Node.js pm2 keeps restarting almost every second

Check if your app modifies a file in the project folder (such as a log file). A change to any of the files triggers restart if watch flag is enabled.

To prevent this, use a process file and add watch_ignore flag in it.

Here's a documentation on how to use the process file:PM2 - Process File

pm2 writes application logs to ~/.pm2/logs and pm2 specific logs to pm2.log by default. We need to check both the locations to debug the issue.

One other way to debug application is by starting the application manually, ie., something like npm run start or node path/yo/your/bin.js

It should give you the missing piece of information to fix the problem and move on.

We also faced a similar problem where pm2 was restarting a process to start a node.js web application almost every second.

We found that MongoDB was not running, and then the web application would try to connect to the database on start up but would fail. This would prompt pm2 to restart the process over and over, causing a restart every second.

If this is your issue, try to start MongoDB with mongod or mongod --dbpath [your db path]?