Basic Node.js Memory Consumption (https://stackoverflow.com/a/45904781/283078)

mem.js

let maxConsumption = 0;

process.nextTick(() => {
    let memUsage = process.memoryUsage();
    if (memUsage.rss > maxConsumption) {
        maxConsumption = memUsage.rss;
    }
});

process.on('exit', () => {
    console.error('Max memory consumption: ' + (maxConsumption / 1048576).toFixed(3) + ' MiB');
});