This is a dead simple NodeJS code that extracts netstat information and prints them out. Worked on Windows 10, 8.1 and 8

netstat.js

function netstat( cb ) {
	const spawn = require( 'child_process' ).spawn;
	const netstat = spawn( 'netstat', [ '-e' ] );

	var resp = '';
	netstat.stdout.on( 'data', ( data ) => {
		resp += data.toString();
	} );

	netstat.stdout.on( 'end', ( data ) => {
		cb( resp );
	} );
}

var lastRec = 0, lastSent = 0;

function monitor() {
	netstat( function( data ) {
		var stats = data.toString(),
			firstLine = /\d+(\s*)\d+/im,
			seperator = /(\d+)/g;

		if ( ( res1 = firstLine.exec( stats ) ) != null ) {
			res1 = res1[0];

			var res2 = res1.match( seperator );
			receivedStats( parseInt( res2[0] ), parseInt( res2[1] ) );
		}
	} );
}

setInterval( monitor, 5000 );

function receivedStats( received, sent ) {
	console.log( `Received: ${received / 1000000} MB\t\tSent: ${sent / 1000000} MB` );
	if ( lastRec > 0 )
		console.log( `Difference: ${received - lastRec}` );
	lastRec = received;
}