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A detailed article on how web developers should price their websites and services to get more freelancing clients. This article can change your life.
You can use environment variable.
For example:
1) NODE_PORT=3002 pm2 start -I 0 app.js2) Read value in app:
console.log(process.env.NODE_PORT);
Or, if you are build express app:
1) PORT=3002 pm2 start -I 0 ./bin/www
2) Express load PORT automatically at start application.