Read large XML

index.js

const fs = require('fs')

const lineReader = require('readline').createInterface({
	input: fs.createReadStream('061018-formated.xml')
});

let item = []
let inside = false
let index = 1

lineReader.on('line', async function (line) {
	if (line.trim().substr(0, 4) === '<ROW') start()
	if (inside) push(line)
	if (line.trim().substr(0, 5) === '</ROW') await end()
})

function start() {
	inside = true
}

async function end() {
	lineReader.pause()

	inside = false
	const row = item.join('\n')

	await saveToFile(row)

	lineReader.resume()
	index++
}

function push(line) {
	item.push(line)
}

async function saveToFile(xml){

	const file = `${__dirname}/profiles/${index}.xml`

	return new Promise((resolve, reject) => {

		fs.writeFile(file, xml, (err) => {
			if (err) return reject(err)
			//console.log(`The file ${file} has been saved!`)
			resolve()
		})

	})

}