chromium.connectOverCDP() connects Playwright to an already running Chromium-based browser; it does not, by itself, connect to Chrome on an Android phone. For actual Android hardware, use Playwright’s separate experimental Android API, which works through ADB. Device emulation is a third option: it simulates selected mobile browser settings but does not exercise physical hardware.
Choose the Playwright path that matches your target
| Path | What it connects to or changes | Best fit | Important qualification |
|---|---|---|---|
chromium.connectOverCDP() |
An existing Chromium-based browser exposed through a Chrome DevTools Protocol (CDP) HTTP or WebSocket endpoint. | Automating or inspecting a running desktop Chromium browser. | Playwright documents this as significantly lower fidelity than its own protocol connection. BrowserType API |
| Playwright Android API | Chrome for Android or Android WebView on an Android device or AVD emulator, using ADB. | Testing through an Android browser or WebView, including on physical Android hardware. | Android automation is experimental and has documented operational limitations. Android API |
| Device emulation | Selected browser settings, such as user agent, viewport, screen dimensions and touch behavior. | Checking responsive layouts and simulated mobile behavior. | Emulation is not a test on an actual phone. Emulation guide |
These routes solve related but different problems. A CDP endpoint is a way to attach to an already running Chromium browser; it is not a synonym for Android device testing. If you want actual hardware behavior, start with the Android API and its ADB requirements.
Attach to an existing Chromium browser with CDP
Use connectOverCDP() when a Chromium-based browser is already running and has exposed a CDP endpoint. The endpoint can be an HTTP URL such as http://localhost:9222 or a CDP WebSocket URL. After connection, inspect the browser’s existing contexts and pages rather than assuming a fresh page was created.
Example using a CDP endpoint
import { chromium } from 'playwright';
const browser = await chromium.connectOverCDP('http://localhost:9222');
try {
const contexts = browser.contexts();
const context = contexts[0];
if (!context) {
throw new Error('The connected browser has no accessible context.');
}
const pages = context.pages();
const page = pages[0];
if (!page) {
throw new Error('The connected context has no open page.');
}
console.log('Current page:', page.url());
await page.screenshot({ path: 'connected-browser.png' });
} finally {
await browser.close();
}Replace the endpoint with the address or WebSocket URL exposed by your running browser. The example deliberately checks for a context and page instead of silently assuming either exists. Use the connection only for functionality supported through CDP: Playwright warns that it is significantly lower fidelity than the Playwright-protocol connection available through browserType.connect(). If you encounter unsupported behavior or need higher fidelity, use that protocol-based connection where your setup permits it. Playwright BrowserType API
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Automate Chrome on a real Android device
For Android hardware, use Playwright’s Android API, not connectOverCDP(). The API can discover Android devices through ADB, launch Chrome, create a page in its context, navigate and take a screenshot. Playwright describes Android automation as experimental support. Android API
Prerequisites
- An Android device or Android Virtual Device (AVD) emulator.
- ADB installed and authenticated so the device is available to the development machine.
- Chrome 87 or newer on the Android target.
- The Chrome flag setting specified in the Playwright Android API documentation.
Follow the current setup instructions and flag name in the official Android API documentation; do not substitute a desktop Chrome remote-debugging setup for the documented Android procedure.
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Example: discover a device, launch Chrome and capture a page
import { _android as android } from 'playwright';
const devices = await android.devices();
if (devices.length === 0) {
throw new Error('No Android device found through ADB.');
}
const device = devices[0];
console.log('Connected device:', device.model());
const context = await device.launchBrowser();
try {
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'android-chrome.png' });
} finally {
await context.close();
await device.close();
}This follows the Android API’s device-discovery and browser-launch workflow. Check the API documentation for the current method signatures and any setup changes for your installed Playwright version. A successful run exercises the Android Chrome path, but does not establish that every test or device feature is supported.
Know the Android API limitations
- Playwright says raw USB operation is not supported by this API; do not assume that plugging in a phone alone completes device access.
- The device must be awake for screenshots.
- Playwright notes that not all tests were run against the device.
- The API is experimental, so confirm that its current support and limitations fit your test plan before relying on it.
When device emulation is enough
Emulation is useful when the question is whether a page responds correctly to a mobile-sized viewport, user agent or touch setting. It is quicker to apply than connecting hardware and can help cover multiple simulated configurations. It cannot validate actual device hardware or prove that behavior matches a particular physical phone. See Playwright’s emulation guide for the parameters it can configure.
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Troubleshoot connection and capture problems
| Symptom | Likely cause | What to check |
|---|---|---|
connectOverCDP() cannot connect |
The target browser is not running with a reachable CDP endpoint, or the endpoint is incorrect or inaccessible. | Confirm the browser exposes CDP, use the actual HTTP or WebSocket endpoint, and verify that the process running Playwright can reach it. |
| No context or open page is available | The connected browser does not have the context or page your script expects. | Inspect browser.contexts() and each context’s pages(); open or select the intended page rather than assuming a new one exists. |
| CDP-connected behavior differs from normal Playwright runs | CDP attachment has lower fidelity than the Playwright protocol connection. | Check whether the feature is supported in this connection mode; consider browserType.connect() if your environment supports it. |
| No Android devices are discovered | ADB is unavailable, the device is not authenticated, or the Android target is not set up as documented. | Verify ADB access and authentication, then follow the current setup steps in the Android API documentation. |
| Android Chrome will not launch | The Chrome version or required flag setting may not meet the documented prerequisites. | Check that the target has Chrome 87 or newer and apply the Chrome flag setting specified in the Playwright documentation. |
| Android screenshot is blank or unavailable | The device may not be awake; screenshots require an awake device. | Wake and unlock the device, then retry the capture. |
| A test works in emulation but not on a phone | Emulation changes selected browser settings but does not reproduce all physical-device conditions. | Run the test through the Android API on a device or AVD when actual Android browser behavior is essential. |
Or skip the browser setup
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For example, this cURL request saves a WebP screenshot of Stripe. See the ScreenshotNeo API documentation for options and response details.
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Frequently Asked Questions
Does connectOverCDP() connect directly to a physical Android phone?
No. It attaches to an existing Chromium browser through a CDP endpoint. Playwright’s separate Android API is the documented path for Android device automation.
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Can I use an Android emulator instead of a physical phone?
Yes. The Android API prerequisites allow an Android Virtual Device emulator as well as an Android device.
Does device emulation count as real-device testing?
No. It simulates selected browser parameters; it does not exercise actual phone hardware.
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