playwright/docs/src/codegen.md

---
id: codegen
title: "Test Generator"
---

Playwright comes with the ability to generate tests out of the box and is a great way to quickly get started with testing. It will open two windows, a browser window where you interact with the website you wish to test and the Playwright Inspector window where you can record your tests, copy the tests, clear your tests as well as change the language of your tests.

```bash js
npx playwright codegen playwright.dev
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="codegen playwright.dev"
```

```bash python
playwright codegen playwright.dev
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen playwright.dev
```

Run `codegen` and perform actions in the browser. Playwright will generate the code for the user interactions. `codegen` will attempt to generate resilient text-based selectors.

<img width="1183" alt="Codegen generating code for tests for playwright.dev website" src="https://user-images.githubusercontent.com/13063165/181852815-971c10da-0b55-4e54-8a73-77e1e825193c.png" />


## Emulate viewport size

Playwright opens a browser window with it's viewport set to a specific width and height and is not responsive as tests need to be run under the same conditions. Use the `--viewport` option to generate tests with a different viewport size.

```bash js
npx playwright codegen --viewport-size=800,600 playwright.dev
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="codegen --viewport-size=800,600 playwright.dev"
```

```bash python
playwright codegen --viewport-size=800,600 playwright.dev
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen --viewport-size=800,600 playwright.dev
```



<img width="1409" alt="Codegen generating code for tests for playwright.dev website with a specific viewport" src="https://user-images.githubusercontent.com/13063165/182360039-6db79ad6-fe82-4fd6-900a-b5e25f7f720f.png" />

## Emulate devices

Record scripts and tests while emulating a mobile device using the `--device` option which sets the viewport size and user agent among others.

```bash js
npx playwright codegen --device="iPhone 11" playwright.dev
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args='codegen --device="iPhone 11" playwright.dev'
```

```bash python
playwright codegen --device="iPhone 11" playwright.dev
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen --device="iPhone 11" playwright.dev
```

<img width="1239" alt="Codegen generating code for tests for playwright.dev website emulated for iPhone 11" src="https://user-images.githubusercontent.com/13063165/182360089-9dc6d33d-480e-4bb2-86a3-fec51c1c228e.png" />


## Emulate color scheme

Record scripts and tests while emulating the color scheme with the `--color-scheme` option.

```bash js
npx playwright codegen --color-scheme=dark playwright.dev
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="codegen --color-scheme=dark playwright.dev"
```

```bash python
playwright codegen --color-scheme=dark playwright.dev
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen --color-scheme=dark playwright.dev
```

<img width="1258" alt="Codegen generating code for tests for playwright.dev website in dark mode" src="https://user-images.githubusercontent.com/13063165/182359371-0bb4a7a2-abbb-4f73-8550-d67e0101f0ad.png" />

## Emulate geolocation, language and timezone

Record scripts and tests while emulating timezone, language & location using the `--timezone`, `--geolocation` and `--lang` options. Once page opens, click the "show your location" icon at them bottom right corner of the map to see geolocation in action.

```bash js
npx playwright codegen --timezone="Europe/Rome" --geolocation="41.890221,12.492348" --lang="it-IT" maps.google.com
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args='codegen --timezone="Europe/Rome" --geolocation="41.890221,12.492348" --lang="it-IT" maps.google.com'
```

```bash python
playwright codegen --timezone="Europe/Rome" --geolocation="41.890221,12.492348" --lang="it-IT" maps.google.com
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen --timezone="Europe/Rome" --geolocation="41.890221,12.492348" --lang="it-IT" maps.google.com
```

<img width="1276" alt="Codegen generating code for tests for google maps showing timezone, geoloation as Rome, Italy and in Italian language" src="https://user-images.githubusercontent.com/13063165/182394434-73e1c2a8-767e-411a-94e4-0912c1c50ecc.png" />

## Preserve authenticated state

Run `codegen` with `--save-storage` to save [cookies](https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies) and [localStorage](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage) at the end of the session. This is useful to separately record an authentication step and reuse it later in the tests. After performing authentication and exiting auth.json will contain the storage state. 

```bash js
npx playwright codegen --save-storage=auth.json
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="codegen  --save-storage=auth.json"
```

```bash python
playwright codegen --save-storage=auth.json
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 codegen --save-storage=auth.json
```

Run with `--load-storage` to consume previously loaded storage. This way, all [cookies](https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies) and [localStorage](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage) will be restored, bringing most web apps to the authenticated state.

```bash js
npx playwright open --load-storage=auth.json my.web.app
npx playwright codegen --load-storage=auth.json my.web.app
```

```bash java
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="open --load-storage=auth.json my.web.app"
mvn exec:java -e -Dexec.mainClass=com.microsoft.playwright.CLI -Dexec.args="codegen --load-storage=auth.json my.web.app"
```

```bash python
playwright open --load-storage=auth.json my.web.app
playwright codegen --load-storage=auth.json my.web.app
```

```bash csharp
pwsh bin\Debug\netX\playwright.ps1 open --load-storage=auth.json my.web.app
pwsh bin\Debug\netX\playwright.ps1 codegen --load-storage=auth.json my.web.app
```


## Record using custom setup

If you would like to use codegen in some non-standard setup (for example, use [`method: BrowserContext.route`]), it is possible to call [`method: Page.pause`] that will open a separate window with codegen controls.

```js
const { chromium } = require('@playwright/test');

(async () => {
  // Make sure to run headed.
  const browser = await chromium.launch({ headless: false });

  // Setup context however you like.
  const context = await browser.newContext({ /* pass any options */ });
  await context.route('**/*', route => route.continue());

  // Pause the page, and start recording manually.
  const page = await context.newPage();
  await page.pause();
})();
```

```java
import com.microsoft.playwright.*;

public class Example {
  public static void main(String[] args) {
    try (Playwright playwright = Playwright.create()) {
      BrowserType chromium = playwright.chromium();
      // Make sure to run headed.
      Browser browser = chromium.launch(new BrowserType.LaunchOptions().setHeadless(false));
      // Setup context however you like.
      BrowserContext context = browser.newContext(/* pass any options */);
      context.route("**/*", route -> route.resume());
      // Pause the page, and start recording manually.
      Page page = context.newPage();
      page.pause();
    }
  }
}
```

```python async
import asyncio
from playwright.async_api import async_playwright

async def main():
    async with async_playwright() as p:
        # Make sure to run headed.
        browser = await p.chromium.launch(headless=False)

        # Setup context however you like.
        context = await browser.new_context() # Pass any options
        await context.route('**/*', lambda route: route.continue_())

        # Pause the page, and start recording manually.
        page = await context.new_page()
        await page.pause()

asyncio.run(main())
```

```python sync
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    # Make sure to run headed.
    browser = p.chromium.launch(headless=False)

    # Setup context however you like.
    context = browser.new_context() # Pass any options
    context.route('**/*', lambda route: route.continue_())

    # Pause the page, and start recording manually.
    page = context.new_page()
    page.pause()
```

```csharp
using Microsoft.Playwright;

using var playwright = await Playwright.CreateAsync();
var chromium = playwright.Chromium;
// Make sure to run headed.
var browser = await chromium.LaunchAsync(new BrowserTypeLaunchOptions { Headless = false });

// Setup context however you like.
var context = await browser.NewContextAsync(); // Pass any options
await context.RouteAsync('**/*', route => route.ContinueAsync());

// Pause the page, and start recording manually.
var page = await context.NewPageAsync();
await page.PauseAsync();
```

## What's Next

- [See a trace of your tests](./trace-viewer.md)