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# chrome-remote-interface [![Build Status][]][travis] [Build Status]: https://app.travis-ci.com/cyrus-and/chrome-remote-interface.svg?branch=master [travis]: https://app.travis-ci.com/cyrus-and/chrome-remote-interface [Chrome Debugging Protocol] interface that helps to instrument Chrome (or any other suitable [implementation](#implementations)) by providing a simple abstraction of commands and notifications using a straightforward JavaScript API. This module is one of the many [third-party protocol clients][3rd-party]. [3rd-party]: https://developer.chrome.com/devtools/docs/debugging-clients#chrome-remote-interface ## Sample API usage The following snippet loads `https://github.com` and dumps every request made: ```js const CDP = require('chrome-remote-interface'); async function example() { let client; try { // connect to endpoint client = await CDP(); // extract domains const {Network, Page} = client; // setup handlers Network.requestWillBeSent((params) => { console.log(params.request.url); }); // enable events then start! await Network.enable(); await Page.enable(); await Page.navigate({url: 'https://github.com'}); await Page.loadEventFired(); } catch (err) { console.error(err); } finally { if (client) { await client.close(); } } } example(); ``` Find more examples in the [wiki]. You may also want to take a look at the [FAQ]. [wiki]: https://github.com/cyrus-and/chrome-remote-interface/wiki [async-await-example]: https://github.com/cyrus-and/chrome-remote-interface/wiki/Async-await-example [FAQ]: https://github.com/cyrus-and/chrome-remote-interface#faq ## Installation npm install chrome-remote-interface Install globally (`-g`) to just use the [bundled client](#bundled-client). ## Implementations This module should work with every application implementing the [Chrome Debugging Protocol]. In particular, it has been tested against the following implementations: Implementation | Protocol version | [Protocol] | [List] | [New] | [Activate] | [Close] | [Version] ---------------------------|--------------------|------------|--------|-------|------------|---------|----------- [Chrome][1.1] | [tip-of-tree][1.2] | yes¹ | yes | yes | yes | yes | yes [Opera][2.1] | [tip-of-tree][2.2] | yes | yes | yes | yes | yes | yes [Node.js][3.1] ([v6.3.0]+) | [node][3.2] | yes | no | no | no | no | yes [Safari (iOS)][4.1] | [*partial*][4.2] | no | yes | no | no | no | no [Edge][5.1] | [*partial*][5.2] | yes | yes | no | no | no | yes [Firefox (Nightly)][6.1] | [*partial*][6.2] | yes | yes | no | yes | yes | yes ¹ Not available on [Chrome for Android][chrome-mobile-protocol], hence a local version of the protocol must be used. [chrome-mobile-protocol]: https://bugs.chromium.org/p/chromium/issues/detail?id=824626#c4 [1.1]: #chromechromium [1.2]: https://chromedevtools.github.io/devtools-protocol/tot/ [2.1]: #opera [2.2]: https://chromedevtools.github.io/devtools-protocol/tot/ [3.1]: #nodejs [3.2]: https://chromedevtools.github.io/devtools-protocol/v8/ [4.1]: #safari-ios [4.2]: http://trac.webkit.org/browser/trunk/Source/JavaScriptCore/inspector/protocol [5.1]: #edge [5.2]: https://docs.microsoft.com/en-us/microsoft-edge/devtools-protocol/0.1/domains/ [6.1]: #firefox-nightly [6.2]: https://firefox-source-docs.mozilla.org/remote/index.html [v6.3.0]: https://nodejs.org/en/blog/release/v6.3.0/ [Protocol]: #cdpprotocoloptions-callback [List]: #cdplistoptions-callback [New]: #cdpnewoptions-callback [Activate]: #cdpactivateoptions-callback [Close]: #cdpcloseoptions-callback [Version]: #cdpversionoptions-callback The meaning of *target* varies according to the implementation, for example, each Chrome tab represents a target whereas for Node.js a target is the currently inspected script. ## Setup An instance of either Chrome itself or another implementation needs to be running on a known port in order to use this module (defaults to `localhost:9222`). ### Chrome/Chromium #### Desktop Start Chrome with the `--remote-debugging-port` option, for example: google-chrome --remote-debugging-port=9222 ##### Headless Since version 59, additionally use the `--headless` option, for example: google-chrome --headless --remote-debugging-port=9222 #### Android Plug the device and enable the [port forwarding][adb], for example: adb forward tcp:9222 localabstract:chrome_devtools_remote Note that in Android, Chrome does not have its own protocol available, a local version must be used. See [here](#chrome-debugging-protocol-versions) for more information. [adb]: https://developer.chrome.com/devtools/docs/remote-debugging-legacy ##### WebView In order to be inspectable, a WebView must be [configured for debugging][webview] and the corresponding process ID must be known. There are several ways to obtain it, for example: adb shell grep -a webview_devtools_remote /proc/net/unix Finally, port forwarding can be enabled as follows: adb forward tcp:9222 localabstract:webview_devtools_remote_<pid> [webview]: https://developers.google.com/web/tools/chrome-devtools/remote-debugging/webviews#configure_webviews_for_debugging ### Opera Start Opera with the `--remote-debugging-port` option, for example: opera --remote-debugging-port=9222 ### Node.js Start Node.js with the `--inspect` option, for example: node --inspect=9222 script.js ### Safari (iOS) Install and run the [iOS WebKit Debug Proxy][iwdp]. Then use it with the `local` option set to `true` to use the local version of the protocol or pass a custom descriptor upon connection (`protocol` option). [iwdp]: https://github.com/google/ios-webkit-debug-proxy ### Edge Start Edge with the `--devtools-server-port` option, for example: MicrosoftEdge.exe --devtools-server-port 9222 about:blank Please find more information [here][edge-devtools]. [edge-devtools]: https://docs.microsoft.com/en-us/microsoft-edge/devtools-protocol/ ### Firefox (Nightly) Start Firefox with the `--remote-debugging-port` option, for example: firefox --remote-debugging-port 9222 Bear in mind that this is an experimental feature of Firefox. ## Bundled client This module comes with a bundled client application that can be used to interactively control a remote instance. ### Target management The bundled client exposes subcommands to interact with the HTTP frontend (e.g., [List](#cdplistoptions-callback), [New](#cdpnewoptions-callback), etc.), run with `--help` to display the list of available options. Here are some examples: ```js $ chrome-remote-interface new 'http://example.com' { "description": "", "devtoolsFrontendUrl": "/devtools/inspector.html?ws=localhost:9222/devtools/page/b049bb56-de7d-424c-a331-6ae44cf7ae01", "id": "b049bb56-de7d-424c-a331-6ae44cf7ae01", "thumbnailUrl": "/thumb/b049bb56-de7d-424c-a331-6ae44cf7ae01", "title": "", "type": "page", "url": "http://example.com/", "webSocketDebuggerUrl": "ws://localhost:9222/devtools/page/b049bb56-de7d-424c-a331-6ae44cf7ae01" } $ chrome-remote-interface close 'b049bb56-de7d-424c-a331-6ae44cf7ae01' ``` ### Inspection Using the `inspect` subcommand it is possible to perform [command execution](#clientdomainmethodparams-callback) and [event binding](#clientdomaineventcallback) in a REPL fashion that provides completion. Here is a sample session: ```js $ chrome-remote-interface inspect >>> Runtime.evaluate({expression: 'window.location.toString()'}) { result: { type: 'string', value: 'about:blank' } } >>> Page.enable() {} >>> Page.loadEventFired(console.log) [Function] >>> Page.navigate({url: 'https://github.com'})