The Tool Desk
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Choose the preset for a basic setup
Jest’s documented integration uses jest-puppeteer for the compact setup: install it as a development dependency, set the preset in Jest configuration, then use the preset-provided page and browser globals. This is the simplest route when you do not need to customize how the browser is launched or connected. See the Jest Puppeteer integration guide.
Install the packages
In an existing Node project, install Jest, Puppeteer, and the preset as development dependencies:
npm install --save-dev jest jest-puppeteer puppeteerPuppeteer’s current system-requirements documentation specifies Node.js 22.12 or newer. It lists Chrome for Testing support on Windows x64, macOS x64/arm64, Debian/Ubuntu Linux x64/arm64, and openSUSE/Fedora Linux; Linux system packages may also be required. Check the Puppeteer system requirements for the CI image and operating system you use, since requirements can change. The documentation does not establish a universally compatible package-version matrix for every project, so use versions compatible with your project’s lockfile.
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Configure Jest
Add a Jest configuration that selects the preset. For a project using package.json, add or merge this property:
{
"jest": {
"preset": "jest-puppeteer"
}
}If your project keeps Jest configuration in a separate file, use the equivalent configuration there:
module.exports = {
preset: 'jest-puppeteer',
};Write a test that captures the page
Create a test file such as home.test.js. This example makes the output directory if needed, visits a page, checks its title, writes a screenshot, and runs asynchronously:
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const fs = require('node:fs/promises');
const path = require('node:path');
describe('home page', () => {
beforeAll(async () => {
await page.goto('https://example.com', { waitUntil: 'networkidle2' });
});
it('has a title and saves a screenshot', async () => {
expect(await page.title()).toBe('Example Domain');
const outputDir = path.join(process.cwd(), 'artifacts');
await fs.mkdir(outputDir, { recursive: true });
await page.screenshot({ path: path.join(outputDir, 'home.png') });
});
});Run the test with:
npx jest home.test.jsOn success, Jest reports a passing test and the PNG appears at artifacts/home.png under the current working directory. Puppeteer’s screenshot API saves to the supplied path when path is set; without a path, page.screenshot() returns image bytes as a Uint8Array by default, or a base64 string when base64 encoding is configured. See Puppeteer’s Page.screenshot() API.
Pick a readiness condition that matches the site
networkidle2 is the wait condition used in a Puppeteer navigation example, not a universal definition of “ready.” Pages with polling, streaming, analytics, or other ongoing requests may not settle as expected; a page can also finish network requests before its important UI has rendered. Choose a readiness condition that fits the application, such as waiting for a known selector after navigation:
await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });
await page.waitForSelector('[data-testid="page-ready"]');Replace the example selector with an element that reliably indicates the page state you need to capture. Puppeteer documents page and element screenshots in its screenshot guide.
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Capture one element instead of the whole page
When the test concerns a particular component, select it and use ElementHandle.screenshot() rather than capturing the whole viewport:
const card = await page.$('[data-testid="product-card"]');
if (!card) throw new Error('Product card was not found');
await card.screenshot({ path: 'artifacts/product-card.png' });The explicit missing-element check makes the failure clearer than attempting to capture a nonexistent handle. The screenshot guide documents element capture.
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Use a custom integration if the preset does not provide the launch, connection, environment, or teardown control your project needs. Jest’s documented pattern uses globalSetup to launch Puppeteer and publish its WebSocket endpoint, a custom test environment to connect to that endpoint, and globalTeardown to close the browser and remove temporary state. This assigns browser ownership explicitly: setup launches, the environment connects, and teardown closes and cleans up. The lifecycle is more involved than the preset; follow the current implementation guidance in the Jest integration guide rather than mixing preset-managed and separately managed browser instances.
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What screenshot tests do—and do not—cover
A saved screenshot is useful as a visual artifact, but the sample above does not compare it against a baseline or decide whether its pixels are correct. Add an explicit image comparison or review workflow if you need visual regression detection. The jest-puppeteer project README points to Argos as an option for tracking changes introduced by pull requests: jest-puppeteer README.
Also distinguish browser assertions from Jest coverage. Jest’s integration guide warns that functions executed through page.$eval, page.$$eval, or page.evaluate run outside Jest’s scope in the described setup, so Jest cannot generate coverage for that page-side code. Use these methods for browser interaction or assertions, but do not treat them as coverage of the code running inside the page.
Troubleshoot common setup failures
- Jest cannot find the preset: confirm
jest-puppeteeris installed in the package where Jest runs, and that the active Jest configuration includespreset: 'jest-puppeteer'. - Browser launch fails in CI: verify the runner meets Puppeteer’s current Node and platform requirements, and install any Linux system packages needed by its distribution. Check the system requirements for the actual CI image.
- The screenshot path fails: create the parent directory before calling
page.screenshot(). The example usesfs.mkdir(..., { recursive: true })to handle a missing directory. - Navigation hangs or captures too early: the site may have ongoing network activity, or the chosen wait condition may not match when the page is visually ready. Use an application-specific readiness signal such as
waitForSelector. - An element screenshot fails: check that the selector matches the loaded page and handle a missing element before calling
screenshot(). - Jest reports missing coverage for page code: browser-side code invoked with
evaluate,$eval, or$$evalis outside Jest’s coverage scope as described in the integration guide; test that code through an appropriate in-page or unit-testing approach.
Or skip the browser setup
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For example, save a screenshot of your own page with cURL:
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Frequently Asked Questions
Does the Jest screenshot example compare images automatically?
No. It saves a screenshot and runs the test assertions shown; pixel comparison or baseline review requires a separate visual-testing workflow.
Can I use a screenshot without writing it to disk?
Yes. Puppeteer’s page.screenshot() returns image bytes by default, or a base64 string when base64 encoding is configured.
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