To automate browser tests with Selenium and JavaScript, install Selenium’s Node.js binding, create a WebDriver session, navigate to your app, interact with elements, assert the visible result, and always close the session. The example below uses Node.js, Selenium WebDriver, and Mocha; Selenium controls the browser, while Mocha organizes and runs the test.
What you need before writing a test
- Node.js: Selenium’s current JavaScript API reference specifies Node.js 22 or later. Check the JavaScript API reference for the current requirement before installing.
- A browser: Choose the browser you want to test, such as Chrome, Firefox, or Edge.
- A test runner: The example uses Mocha, a common JavaScript choice in Selenium’s documentation. Jest is another option; a runner is not required to control the browser, but it helps organize tests and lifecycle hooks.
Selenium WebDriver is an interface for automating browsers. The JavaScript binding runs in Node.js and communicates with a browser-specific driver, which then controls the browser. Selenium’s official documentation describes WebDriver as a W3C Recommendation. See Selenium WebDriver documentation for the protocol and browser automation concepts.
Install Selenium and Mocha
Create a project directory, initialize an npm project, and install the browser automation package and test runner:
mkdir selenium-js-tests
cd selenium-js-tests
npm init -y
npm install selenium-webdriver
npm install --save-dev mochaThe Selenium package installation command is npm install selenium-webdriver. Selenium Manager can handle browser-driver setup when you have not provided a driver yourself. Automated browser management is documented as available starting with Selenium 4.11.0; that does not guarantee every environment can download a browser or driver. Network access, permissions, cache state, and CI restrictions can affect setup.
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Write a browser test with a reliable lifecycle
Save the following as test/search.test.js. It opens a browser, searches a page, waits for the expected result, checks it with Node’s assertion library, and quits the browser even if an assertion fails.
const { Builder, By, until } = require('selenium-webdriver');
const assert = require('node:assert/strict');
describe('website search', function () {
this.timeout(30000);
let driver;
before(async function () {
driver = await new Builder().forBrowser('chrome').build();
});
after(async function () {
if (driver) {
await driver.quit();
}
});
it('shows results for a search term', async function () {
await driver.get('https://www.selenium.dev/');
const searchButton = await driver.findElement(By.css('button[aria-label="Search"]'));
await searchButton.click();
const searchInput = await driver.wait(
until.elementLocated(By.css('input[placeholder="Search"]')),
10000,
'Search input did not appear'
);
await searchInput.sendKeys('WebDriver');
const result = await driver.wait(
until.elementLocated(By.css('a[href*="webdriver"]')),
10000,
'A WebDriver search result did not appear'
);
assert.ok(await result.isDisplayed(), 'Expected a visible WebDriver result');
});
});Page structure changes over time, so treat the selectors in this illustrative test as selectors to verify against the live page before relying on it. For your own application, prefer stable, intentional selectors—such as a test-specific attribute or accessible name—over brittle selectors tied to layout or generated class names.
Run it
Add a script to package.json:
{
"scripts": {
"test": "mocha"
}
}Then run the test from the project directory:
npm testMocha discovers files in its default test directory. The test’s before hook starts one browser session, and after closes it. Selenium’s documentation also shows Node’s assert for checking page titles and confirmation messages. The lifecycle pattern is more important than this particular runner: if setup succeeds and a test fails, teardown should still release the browser session.
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Synchronize on page conditions, not guessed delays
Modern pages often render or update asynchronously. A fixed sleep only proves that a period elapsed; it does not prove that the element or state your test needs is ready. Use an explicit wait for the condition required by the next action or assertion, as the sample does for locating the input and result.
Selenium documents multiple waiting strategies, and the precise choice depends on the condition and application behavior. Consult the current waiting strategies documentation rather than applying a global delay or mixing wait styles without understanding their interaction. Wait for meaningful states—an element to exist, become visible, or become enabled—before acting on it.
Choose selectors and assertions that test user outcomes
A useful browser test follows the user-visible path without coupling itself unnecessarily to implementation details:
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- Navigate with
driver.get(url). - Locate a control using
By.css(), an accessible name, or another locator suited to the application. - Act with browser interactions such as
click()orsendKeys(). - Wait for the resulting page state.
- Assert a relevant outcome, such as a confirmation message, changed title, or visible result.
Keep assertions tied to what the feature promises. A test that only checks that a click did not throw an error can pass even when the intended outcome never occurred. Where possible, use selectors your application deliberately maintains for tests, and assert the resulting state rather than a transient implementation detail.
Run locally, then move to remote browsers when needed
Start with a local browser while developing a test. It is simpler to inspect the browser and diagnose a selector or timing problem. When you need browser coverage across machines or operating systems, or more execution capacity, Selenium can connect to a remote WebDriver through Selenium Server; Selenium Grid is the project’s option for distributing tests across machines and platform combinations.
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When WebDriver BiDi is useful
Classic WebDriver commands are a natural fit for navigating, locating elements, and performing actions. If a test also needs event-driven browser signals—such as network requests, console messages, or JavaScript errors—WebDriver BiDi may be relevant. Selenium describes BiDi as a bidirectional W3C protocol that adds a WebSocket connection for receiving browser events.
Do not assume every browser and JavaScript binding implements every BiDi feature equally. Confirm support for the specific event and browser combination you need before making it part of a test design. Read Selenium’s WebDriver BiDi documentation for the current capabilities and guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common Selenium JavaScript test problems
| Symptom | Likely cause | What to do |
|---|---|---|
| Browser or driver cannot start | The browser is unavailable, driver setup is blocked, or the environment cannot download required files. | Verify the browser is installed and supported in the environment. Check network access, permissions, and Selenium Manager’s ability to use its cache or download what it needs. In restricted CI environments, provide browser and driver setup explicitly. |
| Element not found | The selector does not match the current page, or the page has not reached the state where the element exists. | Inspect the rendered page and selector, then wait for the relevant condition before locating or interacting with the element. |
| Element is found but interaction fails | The element may be hidden, disabled, covered, or not yet ready for interaction. | Wait for the appropriate visible or enabled state and check that the target is the intended control. Avoid treating a successful lookup as proof the element is actionable. |
| Test passes locally but fails remotely or in CI | Browser versions, operating systems, network conditions, permissions, or timing may differ. | Record which browser and environment are used, use condition-based waits, and reproduce the test in the same remote configuration where possible. |
| Browser processes remain after a failed test | The session was not closed after an error or assertion failure. | Put driver.quit() in a reliable teardown path such as Mocha’s after hook or a finally block. |
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