[Whole Web, Nods.js, PM2] Passing environment variables to node.js using pm2

 learn how to pass environment variables to your node.js app using the pm2 config file. This is useful for setting options inside your app such as production or development.

pm2.config.json:

{
  "apps": [{
    "name": "App1",
    "script": "app1/server.js",
    "log_file": "log/app1.log",
    "error_file": "log/app1-err.log",
    "watch": true,
    "ignore_watch": ["file"],
    "env": {
      "STATUS": "GOOD"
    }
  },{
    "name": "App2",
    "script": "app2/server.js",
    "log_file": "log/app2.log",
    "error_file": "log/app2-err.log"
  }]
}

app1/server.js:

Use process.env.STATUS to get the value:

var http = require("http");
var server = http.createServer(function(request, response){
    response.writeHead('200', {"Content-Type": "text/plain"});
    response.end("Hello from app, is this reload? " + process.env.STATUS);
});
server.listen(3002);
console.log("Listen on port 3002");