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Measure and compare API endpoint performance

REST API Benchmarking

Get precise latency percentiles (p50, p95, p99) for every REST endpoint. Compare performance across deployments, identify slow queries, and establish SLA baselines.
Percentile-based latency metrics (p50, p95, p99)
Endpoint-by-endpoint comparison
Throughput measurement (requests/second)
Error rate tracking
Custom thresholds and SLA validation
Historical comparison across test runs
benchmark.js
import http from 'k6/http';
import { check } from 'k6';
import { Trend } from 'k6/metrics';

const getUsers = new Trend('get_users_duration');
const getOrders = new Trend('get_orders_duration');

export const options = {
  vus: 100,
  duration: '5m',
  thresholds: {
    get_users_duration: ['p(95)<300'],
    get_orders_duration: ['p(95)<500'],
  },
};

export default function () {
  const users = http.get('https://api.example.com/users');
  getUsers.add(users.timings.duration);

  const orders = http.get('https://api.example.com/orders');
  getOrders.add(orders.timings.duration);
}

Frequently asked questions

Related guides

API Load Testing
Load test REST and GraphQL APIs at a fixed request rate, with per-second latency and error charts.
HTTP Load Testing
Run HTTP load tests against any endpoint. GET, POST, PUT and DELETE with custom headers and payloads.
Performance Testing Checklist
Complete performance testing checklist: test types, metrics to measure, tools to use, and common mistakes to avoid.

Run this as a plan

Put the scenario in your app's Config/load-plan.json and run it from the narduk-app CLI.
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