section13.4.md

Section 13.4: Using different Properties/Configuration for different environments like dev, qa, staging etc

Suppose we have two property files for different environment.

dev.json

{
  PORT : 3000,
  DB : {
    host : "localhost",
    user : "bob",
    password : "12345"
  }
}

qa.json

{
  PORT : 3001,
  DB : {
    host : "where_db_is_hosted",
    user : "bob",
    password : "54321"
  }
}

Following code in application will export respective property file which we want to use.

Suppose the code is in environment.js

process.argv.forEach(function (val, index, array) {
  let arg = val.split("=");
  if (arg.length > 0) {
    if (arg[0] === 'env') {
      let env = require('./' + arg[1] + '.json');
      module.exports = env;
    }
  }
});

We give arguments to the application like following

node app.js env=dev

if we are using process manager like forever than it as simple as forever start app.js env=dev How to use the configuration file

let env= require("environment.js");