How can I automate performance tests for my JavaScript application?

How can I automate performance tests for my JavaScript application?

You can use tools like Jest, Mocha, or Puppeteer to automate performance testing in JavaScript. Would you like to know more about a specific tool?

What is Puppeteer and how does it help with performance testing?

Puppeteer is a Node library that provides a high-level API to control Chrome or Chromium. It can be used to measure performance metrics like load time and resource usage.

Can you give me an example of a performance test using Puppeteer?

Sure! Here's a simple example:

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  const performance = await page.evaluate(() => JSON.stringify(window.performance));
  console.log(performance);
  await browser.close();
})();

This script navigates to a webpage and logs the performance metrics.

What other tools can I use for performance testing?

Other popular tools include Lighthouse, WebPageTest, and LoadRunner. Each has its own strengths depending on your needs.