Load Testing & Performance Benchmarking (JMeter & k6) · Pelajaran

Menulis Skrip Dasar k6

Buat skrip k6 pertama Anda untuk mengirim permintaan HTTP dan mensimulasikan pengguna virtual.

Menulis Skrip Dasar k6 adalah pelajaran Load Testing & Performance Benchmarking (JMeter & k6) gratis di CoddyKit. Ini adalah pelajaran 2 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Load Testing & Performance Benchmarking (JMeter & k6), dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Load Testing & Performance Benchmarking (JMeter & k6) mencakup 4 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

Start Your k6 Script Journey

Welcome to writing k6 scripts! k6 uses JavaScript to define your load tests, making it familiar for many developers.

A k6 script describes what your virtual users will do and how the load should be simulated.

Define user actions like visiting pages or logging in.
Specify the number of virtual users (VUs) and test duration.
Validate server responses to ensure correctness.

Anatomy of a k6 Script

Every k6 script typically has two main parts:

The options object: Here you configure test-wide settings like virtual users (VUs) and test duration.
The default function: This is where your virtual users' actions are defined. It's executed repeatedly by each VU.

Think of the default function as the "main loop" for each virtual user.

Sending HTTP GET Requests

The most common action in a performance test is sending an HTTP request. k6 provides the k6/http module for this.

To send a simple GET request, you'll use http.get('URL'). This simulates a browser fetching a web page or an API endpoint.

Remember to import the http module at the top of your script.

Code: Basic GET Request

Let's write our first k6 script to make a GET request to example.com. Copy and run this script using the k6 CLI.

k6 run your_script.js

import http from 'k6/http';
import { sleep } from 'k6/execution';

export default function () {
  http.get('https://test.k6.io');
  sleep(1); // Wait for 1 second between requests
}

What are Virtual Users (VUs)?

In k6, a Virtual User (VU) simulates a real user interacting with your system. Each VU executes the default function independently.

If you have 10 VUs, it's like 10 people simultaneously using your application. k6 efficiently manages these VUs.

By controlling the number of VUs, you can simulate different levels of load on your application.

Configuring Test Load with Options

The options object is crucial for defining your test scenario. It sits at the top level of your script.

Two key options are:

vus: The total number of virtual users to run concurrently.
duration: How long the test should run (e.g., '30s', '5m', '2h').

These settings tell k6 how to distribute and execute your default function.

Code: VUs and Test Duration

This script runs with 5 virtual users for a duration of 10 seconds, hitting the test website repeatedly.

Observe how k6 reports the VUs and duration when you run this script.

import http from 'k6/http';
import { sleep } from 'k6/execution';

export const options = {
  vus: 5,
  duration: '10s',
};

export default function () {
  http.get('https://test.k6.io');
  sleep(1);
}

Sending Data with POST Requests

Beyond GET, you often need to send data to the server, like submitting a form or creating a resource. For this, you use http.post().

The http.post() function takes three arguments:

The URL.
The request body (usually a JSON string or form data).
Optional parameters like headers.

Code: Simple POST Request

Here's an example of a POST request sending JSON data. Notice how we specify the Content-Type header to tell the server we're sending JSON.

import http from 'k6/http';
import { sleep } from 'k6/execution';

export const options = {
  vus: 1,
  duration: '5s',
};

export default function () {
  const url = 'https://httpbin.org/post';
  const payload = JSON.stringify({
    name: 'Coddy',
    job: 'Learner',
  });

  const params = {
    headers: {
      'Content-Type': 'application/json',
    },
  };

  http.post(url, payload, params);
  sleep(1);
}

Test Your Scripting Skills

Which of the following statements about basic k6 scripting are TRUE?

Recap: Your First k6 Scripts

Great job! You've learned the fundamentals of writing k6 scripts:

The basic structure with options and the default function.
How to send simple HTTP GET and POST requests using k6/http.
Configuring test load with vus and duration.

In the next lesson, we'll dive into validating responses with Checks and setting performance targets with Thresholds!

Pertanyaan yang Sering Diajukan

Apakah pelajaran “Menulis Skrip Dasar k6” gratis?

Ya — teks lengkap “Menulis Skrip Dasar k6” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Load Testing & Performance Benchmarking (JMeter & k6), upgrade ke CoddyKit PRO. Kursus Load Testing & Performance Benchmarking (JMeter & k6) mencakup 4 pelajaran total.

Apa yang akan aku pelajari di “Menulis Skrip Dasar k6”?

Buat skrip k6 pertama Anda untuk mengirim permintaan HTTP dan mensimulasikan pengguna virtual. Kamu berlatih Load Testing & Performance Benchmarking (JMeter & k6) dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai Load Testing & Performance Benchmarking (JMeter & k6)?

Tidak diperlukan pengalaman sebelumnya. Load Testing & Performance Benchmarking (JMeter & k6) di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 2 dari 4.

Berapa lama pelajaran “Menulis Skrip Dasar k6” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran Load Testing & Performance Benchmarking (JMeter & k6) ini?

Ya. Setiap pelajaran Load Testing & Performance Benchmarking (JMeter & k6) menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

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