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169 lines
8.6 KiB
Markdown
169 lines
8.6 KiB
Markdown
---
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id: debug
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title: "Debugging tools"
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---
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Playwright scripts work with existing debugging tools, like Node.js debuggers and browser developer tools. Playwright also introduces new debugging features for browser automation.
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- [Run in headful mode](#run-in-headful-mode)
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- [Visual Studio Code debugger](#visual-studio-code-debugger)
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- [Browser Developer Tools](#browser-developer-tools)
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- [Run in Debug Mode](#run-in-debug-mode)
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- [Verbose API logs](#verbose-api-logs)
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## Run in headful mode
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Playwright runs browsers in headless mode by default. To change this behavior, use `headless: false` as a launch option. You can also use the `slowMo` option to slow down execution and follow along while debugging.
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```js
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await chromium.launch({ headless: false, slowMo: 100 }); // or firefox, webkit
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```
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## Visual Studio Code debugger
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The VS Code debugger can be used to pause and resume execution of Playwright scripts with breakpoints. The debugger can be configured in two ways.
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### Use launch config
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Setup [`launch.json` configuration](https://code.visualstudio.com/docs/nodejs/nodejs-debugging) for your Node.js project. Once configured launch the scripts with F5 and use breakpoints.
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### Use the new JavaScript debugger
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VS Code 1.46+ introduces the new JavaScript debugger behind a feature flag. The new debugger does not require a `launch.json` configuration. To use this:
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1. Enable the preview debugger
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* Open JSON settings and add `"debug.javascript.usePreview": true`
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* Open settings UI and enable the `Debug › JavaScript: Use Preview` setting
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1. Set a breakpoint in VS Code
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* Use the `debugger` keyword or set a breakpoint in the VS Code UI
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1. Run your Node.js script from the terminal
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## Browser Developer Tools
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You can use browser developer tools in Chromium, Firefox and WebKit while running a Playwright script. Developer tools help to:
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* Inspect the DOM tree and **find element selectors**
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* **See console logs** during execution (or learn how to [read logs via API](./verification.md#console-logs))
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* Check **network activity** and other developer tools features
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<a href="https://user-images.githubusercontent.com/284612/77234134-5f21a500-6b69-11ea-92ec-1c146e1333ec.png"><img src="https://user-images.githubusercontent.com/284612/77234134-5f21a500-6b69-11ea-92ec-1c146e1333ec.png" width="500" alt="Chromium Developer Tools"></img></a>
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> **For WebKit**: Note that launching WebKit Inspector during the execution will prevent the Playwright script from executing any further.
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### API for Chromium
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In Chromium, you can also open developer tools through a launch option.
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```js
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await chromium.launch({ devtools: true });
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```
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## Run in Debug Mode
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Set the `PWDEBUG` environment variable to run your scripts in debug mode. This configures the browser for debugging.
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```sh
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# Linux/macOS
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$ PWDEBUG=1 npm run test
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# Windows
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$ set PWDEBUG=1
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$ npm run test
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```
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### Defaults
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With PWDEBUG, the following defaults are configured for you:
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* **Run in headful**: With PWDEBUG, browsers always launch in headful mode
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* **Disables timeout**: PWDEBUG sets timeout to 0 (= no timeout)
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* **Preserve DevTools preferences**: When used with `devtools: true`, PWDEBUG preserves the docked/undocked state of Chrome DevTools
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### Debugging Selectors
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PWDEBUG configures a `playwright` object in the browser to highlight [Playwright selectors](./selectors.md). This can be used to verify text or composite selectors. To use this:
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1. Setup a breakpoint to pause the execution
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1. Open the console panel in browser developer tools
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1. Use the `playwright` API
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* `playwright.$(selector)`: Highlight the first occurrence of the selector. This reflects how `page.$` would see the page.
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* `playwright.$$(selector)`: Highlight all occurrences of the selector. This reflects how `page.$$` would see the page.
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* `playwright.inspect(selector)`: Inspect the selector in the Elements panel.
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* `playwright.clear()`: Clear existing highlights.
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<a href="https://user-images.githubusercontent.com/284612/86857345-299abc00-c073-11ea-9e31-02923a9f0d4b.png"><img src="https://user-images.githubusercontent.com/284612/86857345-299abc00-c073-11ea-9e31-02923a9f0d4b.png" width="500" alt="Highlight selectors"></img></a>
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### Evaluate Source Maps
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PWDEBUG also enables source maps for [`page.evaluate` executions](core-concepts.md#evaluation). This improves the debugging experience for JavaScript executions in the page context.
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<a href="https://user-images.githubusercontent.com/284612/86857568-a6c63100-c073-11ea-82a4-bfd531a4ec87.png"><img src="https://user-images.githubusercontent.com/284612/86857568-a6c63100-c073-11ea-82a4-bfd531a4ec87.png" width="500" alt="Highlight selectors"></img></a>
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## Verbose API logs
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Playwright supports verbose logging with the `DEBUG` environment variable.
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```sh
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# Linux/macOS
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$ DEBUG=pw:api npm run test
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# Windows
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$ set DEBUG=pw:api
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$ npm run test
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```
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[Playwright]: api/class-playwright.md "Playwright"
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[Browser]: api/class-browser.md "Browser"
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[BrowserContext]: api/class-browsercontext.md "BrowserContext"
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[Page]: api/class-page.md "Page"
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[Frame]: api/class-frame.md "Frame"
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[ElementHandle]: api/class-elementhandle.md "ElementHandle"
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[JSHandle]: api/class-jshandle.md "JSHandle"
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[ConsoleMessage]: api/class-consolemessage.md "ConsoleMessage"
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[Dialog]: api/class-dialog.md "Dialog"
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[Download]: api/class-download.md "Download"
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[Video]: api/class-video.md "Video"
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[FileChooser]: api/class-filechooser.md "FileChooser"
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[Keyboard]: api/class-keyboard.md "Keyboard"
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[Mouse]: api/class-mouse.md "Mouse"
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[Touchscreen]: api/class-touchscreen.md "Touchscreen"
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[Request]: api/class-request.md "Request"
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[Response]: api/class-response.md "Response"
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[Selectors]: api/class-selectors.md "Selectors"
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[Route]: api/class-route.md "Route"
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[WebSocket]: api/class-websocket.md "WebSocket"
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[TimeoutError]: api/class-timeouterror.md "TimeoutError"
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[Accessibility]: api/class-accessibility.md "Accessibility"
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[Worker]: api/class-worker.md "Worker"
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[BrowserServer]: api/class-browserserver.md "BrowserServer"
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[BrowserType]: api/class-browsertype.md "BrowserType"
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[Logger]: api/class-logger.md "Logger"
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[ChromiumBrowser]: api/class-chromiumbrowser.md "ChromiumBrowser"
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[ChromiumBrowserContext]: api/class-chromiumbrowsercontext.md "ChromiumBrowserContext"
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[ChromiumCoverage]: api/class-chromiumcoverage.md "ChromiumCoverage"
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[CDPSession]: api/class-cdpsession.md "CDPSession"
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[FirefoxBrowser]: api/class-firefoxbrowser.md "FirefoxBrowser"
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[WebKitBrowser]: api/class-webkitbrowser.md "WebKitBrowser"
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[Array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array "Array"
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[Buffer]: https://nodejs.org/api/buffer.html#buffer_class_buffer "Buffer"
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[ChildProcess]: https://nodejs.org/api/child_process.html "ChildProcess"
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[Element]: https://developer.mozilla.org/en-US/docs/Web/API/element "Element"
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[Error]: https://nodejs.org/api/errors.html#errors_class_error "Error"
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[Evaluation Argument]: ./core-concepts.md#evaluationargument "Evaluation Argument"
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[Map]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map "Map"
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[Object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object"
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[Promise]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "Promise"
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[RegExp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp "RegExp"
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[Serializable]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#Description "Serializable"
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[UIEvent.detail]: https://developer.mozilla.org/en-US/docs/Web/API/UIEvent/detail "UIEvent.detail"
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[URL]: https://nodejs.org/api/url.html "URL"
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[USKeyboardLayout]: ../src/usKeyboardLayout.ts "USKeyboardLayout"
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[UnixTime]: https://en.wikipedia.org/wiki/Unix_time "Unix Time"
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[boolean]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean"
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[function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function "Function"
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[iterator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols "Iterator"
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[null]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null "null"
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[number]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number"
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[origin]: https://developer.mozilla.org/en-US/docs/Glossary/Origin "Origin"
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[selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors "selector"
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[Readable]: https://nodejs.org/api/stream.html#stream_class_stream_readable "Readable"
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[string]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "string"
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[xpath]: https://developer.mozilla.org/en-US/docs/Web/XPath "xpath"
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