Identify missing and missing keys in different languages ​​by taking one as a reference

i18n-diff.js

const genericFile = require('./locales/en.json')
const colors = require('colors')

// Load all translation in locales folder
let translations = {}
require('fs').readdirSync('./locales/').forEach((file) => {
	if (file.match(/\.json$/) !== null) {
		let name = file.replace('.json', '')
		translations[name] = require('./locales/' + file)
	}
});

const missing = (master, slave) => {
	const slaveKeys = Object.keys(slave)
	return Object.keys(master).filter(key => slaveKeys.indexOf(key)=== -1)
};

const init = () => {	
	console.log(colors.bold.underline('Translations differences'))

	Object.keys(translations)
		.forEach((lang) => {
			const translationsMissing = missing(genericFile,translations[lang])
			const translationsSurplus = missing(translations[lang],genericFile)
			
			//Print Output
			console.log(colors.bold('  ./locales/' + lang + '.json'))
			translationsMissing.map( x => console.log(colors.green('   +++ '+ x)))
			translationsSurplus.map( x => console.log(colors.red('   --- '+ x)))
		});
};

init();