k6 — Load Testing Your API

# Install k6
brew install k6  # macOS

# Or Docker
docker run -i grafana/k6 run - < script.js

import http from "k6/http";
import { check, sleep } from "k6";

export const options = {
  vus: 10,          // Virtual users
  duration: "30s",  // Duration
};

export default function () {
  const res = http.get("http://localhost:3000/api/users");

  check(res, {
    "status is 200": (r) => r.status === 200,
    "response time < 200ms": (r) => r.timings.duration < 200,
  });

  sleep(1);
}

export const options = {
  stages: [
    { duration: "30s", target: 20 },  // Ramp up
    { duration: "1m", target: 20 },   // Stay at 20
    { duration: "20s", target: 0 },   // Ramp down
  ],
};