Load Test

ELI5 — The Vibe Check

A load test is when you throw a huge crowd of fake users at your app to see how it handles them. Can your server handle 1000 users logging in at the same time? A load test finds out before your real users do — and crash your app on launch day.

Real Talk

Load testing measures system performance under expected and peak load conditions. It simulates concurrent users to identify bottlenecks, measure response times, and validate that the system meets performance SLAs. Tools include k6, JMeter, and Locust.

Show Me The Code

// k6 load test
import http from 'k6/http';
import { sleep } from 'k6';

export const options = { vus: 100, duration: '30s' };

export default function () {
  http.get('https://myapp.com/api/products');
  sleep(1);
}

When You'll Hear This

"Run a load test before Black Friday — simulate 5000 concurrent users." / "Load testing revealed the DB connection pool was the bottleneck."