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node js language util module
const langPackage = require('languagenpm');
const langPacks = {};
langPacks.vi = new langPackage();
langPacks.en = new langPackage();
langPacks.vi.importJSON('path to json file');
const key = 'HELLO';
const objReplace = {username: 'Andrew', lastLogin: '03/21/2017'};
const result = langPacks.vi.get(key, objReplace);
{ "HELLO":"Hello {username}. Your last login on: {lastLogin}" }