Keeps a process running unless stopped explicitely

Key Features

•	Keeps apps running continuously.
•	Automatically restarts crashed apps.
•	Provides monitoring and logging.
•	Supports running multiple app instances for better performance.

https://pm2.keymetrics.io/

npm i -g pm2

• Create a file called app.js

const express = require("express");
const app = express();

app.get("/", (req, res) => {
  res.send("Hello, World!");
});

const PORT = 3000;
app.listen(PORT, () => {
  console.log(`Server is running on <http://localhost>:${PORT}`);
});

• Run the following command

pm2 start app.js

Terms to understand

• curl: similar to postman but for terminal
• lsof: this gives you the process id for a given port