Playwright MCP - Enhanced for API Testing

This fork of the Playwright MCP server introduces powerful API testing capabilities, allowing integration with real-world API endpoints using Playwright.

Key API Features

• Comprehensive Method Support: Perform HTTP API requests, including GET, POST, PUT, PATCH, and DELETE.
• Advanced Validation: Validate responses with expected statuses, content-types, and body structures.
• Session Management: Group related API calls using session IDs for organized reporting and debugging.
• Chained Requests: Execute sequences of dependent API requests, using outputs from one step in subsequent ones.

Original Features Reference

The original Playwright MCP capabilities for browser automation remain intact and unchanged. Refer to the original documentation for full details on browser testing features.

Installation

Install the enhanced Playwright MCP server with API support (note the --caps parameter values):

{
  "mcpServers": {
    "playwright": {
      "command": "npx",
      "args": [
        "@democratize-quality/playwright-mcp",
        "--caps", 
        "api_session_report,api_session_status,api_request"
      ]
    }
  }
}

Quick Start for API Testing

1. Basic Example:

   Use the api_request tool for performing a GET request:

   {
     "method": "GET",
     "url": "https://jsonplaceholder.typicode.com/posts/1"
   }

2. Advanced Features:

   • Validation:

     {
       "method": "GET",
       "url": "https://jsonplaceholder.typicode.com/posts/1",
       "expect": {
         "status": 200,
         "contentType": "application/json"
       }
     }

3. Chained Requests:

   • Execute a login and retrieval sequence.

     {
       "chain": [
         {
           "name": "login",
           "method": "POST",
           "url": "https://reqres.in/api/login",
           "headers": { "Content-Type": "application/json" },
           "data": { "email": "[email protected]", "password": "cityslicka" },
           "extract": { "token": "token" }
         },
         {
           "name": "getUser",
           "method": "GET",
           "url": "https://reqres.in/api/users/2",
           "headers": { "Authorization": "Bearer {{login.token}}" }
         }
       ]
     }

For more detailed API usage examples and advanced scenarios, refer to the accompanying api_tool_usage.md guide.

Requirements

• Node.js 18 or newer
• VS Code, Cursor, Windsurf, Claude Desktop, Goose or any other MCP client

Configuration

Playwright MCP server supports following arguments. They can be provided in the JSON configuration above, as a part of the "args" list:

> npx @democratize-quality/playwright-mcp --help
  --allowed-origins <origins>  semicolon-separated list of origins to allow the
                               browser to request. Default is to allow all.
  --blocked-origins <origins>  semicolon-separated list of origins to block the
                               browser from requesting. Blocklist is evaluated
                               before allowlist. If used without the allowlist,
                               requests not matching the blocklist are still
                               allowed.
  --block-service-workers      block service workers
  --browser <browser>          browser or chrome channel to use, possible
                               values: chrome, firefox, webkit, msedge.
  --caps <caps>                comma-separated list of additional capabilities
                               to enable, possible values: vision, pdf.
  --cdp-endpoint <endpoint>    CDP endpoint to connect to.
  --config <path>              path to the configuration file.
  --device <device>            device to emulate, for example: "iPhone 15"
  --executable-path <path>     path to the browser executable.
  --headless                   run browser in headless mode, headed by default
  --host <host>                host to bind server to. Default is localhost. Use
                               0.0.0.0 to bind to all interfaces.
  --ignore-https-errors        ignore https errors
  --isolated                   keep the browser profile in memory, do not save
                               it to disk.
  --image-responses <mode>     whether to send image responses to the client.
                               Can be "allow" or "omit", Defaults to "allow".
  --no-sandbox                 disable the sandbox for all process types that
                               are normally sandboxed.
  --output-dir <path>          path to the directory for output files.
  --port <port>                port to listen on for SSE transport.
  --proxy-bypass <bypass>      comma-separated domains to bypass proxy, for
                               example ".com,chromium.org,.domain.com"
  --proxy-server <proxy>       specify proxy server, for example
                               "http://myproxy:3128" or "socks5://myproxy:8080"
  --save-session               Whether to save the Playwright MCP session into
                               the output directory.
  --save-trace                 Whether to save the Playwright Trace of the
                               session into the output directory.
  --storage-state <path>       path to the storage state file for isolated
                               sessions.
  --user-agent <ua string>     specify user agent string
  --user-data-dir <path>       path to the user data directory. If not
                               specified, a temporary directory will be created.
  --viewport-size <size>       specify browser viewport size in pixels, for
                               example "1280, 720"

User profile

You can run Playwright MCP with persistent profile like a regular browser (default), or in the isolated contexts for the testing sessions.

Persistent profile

All the logged in information will be stored in the persistent profile, you can delete it between sessions if you'd like to clear the offline state. Persistent profile is located at the following locations and you can override it with the --user-data-dir argument.

# Windows
%USERPROFILE%\AppData\Local\ms-playwright\mcp-{channel}-profile

# macOS
- ~/Library/Caches/ms-playwright/mcp-{channel}-profile

# Linux
- ~/.cache/ms-playwright/mcp-{channel}-profile

Isolated

In the isolated mode, each session is started in the isolated profile. Every time you ask MCP to close the browser, the session is closed and all the storage state for this session is lost. You can provide initial storage state to the browser via the config's contextOptions or via the --storage-state argument. Learn more about the storage state here.

{
  "mcpServers": {
    "playwright": {
      "command": "npx",
      "args": [
        "@democratize-quality/playwright-mcp",
        "--isolated",
        "--storage-state={path/to/storage.json}",
        "--caps",
        "api_session_report,api_session_status,api_request"
      ]
    }
  }
}

Configuration file

The Playwright MCP server can be configured using a JSON configuration file. You can specify the configuration file using the --config command line option:

npx @democratize-quality/playwright-mcp --config path/to/config.json --caps api_session_report,api_session_status,api_request

Standalone MCP server

When running headed browser on system w/o display or from worker processes of the IDEs, run the MCP server from environment with the DISPLAY and pass the --port flag to enable HTTP transport.

npx @democratize-quality/playwright-mcp --port 8931 --caps api_session_report,api_session_status,api_request

And then in MCP client config, set the url to the HTTP endpoint:

{
  "mcpServers": {
    "playwright": {
      "url": "http://localhost:8931/mcp"
    }
  }
}

NOTE: The Docker implementation only supports headless chromium at the moment.

{
  "mcpServers": {
    "playwright": {
      "command": "docker",
      "args": ["run", "-i", "--rm", "--init", "--pull=always", "mcr.microsoft.com/playwright/mcp"]
    }
  }
}

You can build the Docker image yourself.

docker build -t mcr.microsoft.com/playwright/mcp .

Tools

• api_request
  • Title: API Request
  • Description: Perform an HTTP API request and validate the response.
  • Parameters:
    • sessionId (string, optional): undefined
    • method (string, optional): undefined
    • url (string, optional): undefined
    • headers (object, optional): undefined
    • data (optional): undefined
    • expect (object, optional): undefined
    • chain (array, optional): undefined
  • Read-only: true

• api_session_status
  • Title: API Session Status
  • Description: Query API test session status, logs, and results by sessionId.
  • Parameters:
    • sessionId (string): undefined
  • Read-only: true

• api_session_report
  • Title: API Session HTML Report
  • Description: Generate and retrieve an HTML report for an API test session by sessionId.
  • Parameters:
    • sessionId (string): undefined
  • Read-only: true

• browser_click
  • Title: Click
  • Description: Perform click on a web page
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot
    • doubleClick (boolean, optional): Whether to perform a double click instead of a single click
    • button (string, optional): Button to click, defaults to left
  • Read-only: false

• browser_close
  • Title: Close browser
  • Description: Close the page
  • Parameters: None
  • Read-only: true

• browser_console_messages
  • Title: Get console messages
  • Description: Returns all console messages
  • Parameters: None
  • Read-only: true

• browser_drag
  • Title: Drag mouse
  • Description: Perform drag and drop between two elements
  • Parameters:
    • startElement (string): Human-readable source element description used to obtain the permission to interact with the element
    • startRef (string): Exact source element reference from the page snapshot
    • endElement (string): Human-readable target element description used to obtain the permission to interact with the element
    • endRef (string): Exact target element reference from the page snapshot
  • Read-only: false

• browser_evaluate
  • Title: Evaluate JavaScript
  • Description: Evaluate JavaScript expression on page or element
  • Parameters:
    • function (string): () => { /* code / } or (element) => { / code */ } when element is provided
    • element (string, optional): Human-readable element description used to obtain permission to interact with the element
    • ref (string, optional): Exact target element reference from the page snapshot
  • Read-only: false

• browser_file_upload
  • Title: Upload files
  • Description: Upload one or multiple files
  • Parameters:
    • paths (array): The absolute paths to the files to upload. Can be a single file or multiple files.
  • Read-only: false

• browser_handle_dialog
  • Title: Handle a dialog
  • Description: Handle a dialog
  • Parameters:
    • accept (boolean): Whether to accept the dialog.
    • promptText (string, optional): The text of the prompt in case of a prompt dialog.
  • Read-only: false

• browser_hover
  • Title: Hover mouse
  • Description: Hover over element on page
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot
  • Read-only: true

• browser_navigate
  • Title: Navigate to a URL
  • Description: Navigate to a URL
  • Parameters:
    • url (string): The URL to navigate to
  • Read-only: false

• browser_navigate_back
  • Title: Go back
  • Description: Go back to the previous page
  • Parameters: None
  • Read-only: true

• browser_navigate_forward
  • Title: Go forward
  • Description: Go forward to the next page
  • Parameters: None
  • Read-only: true

• browser_network_requests
  • Title: List network requests
  • Description: Returns all network requests since loading the page
  • Parameters: None
  • Read-only: true

• browser_press_key
  • Title: Press a key
  • Description: Press a key on the keyboard
  • Parameters:
    • key (string): Name of the key to press or a character to generate, such as ArrowLeft or a
  • Read-only: false

• browser_resize
  • Title: Resize browser window
  • Description: Resize the browser window
  • Parameters:
    • width (number): Width of the browser window
    • height (number): Height of the browser window
  • Read-only: true

• browser_select_option
  • Title: Select option
  • Description: Select an option in a dropdown
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot
    • values (array): Array of values to select in the dropdown. This can be a single value or multiple values.
  • Read-only: false

• browser_snapshot
  • Title: Page snapshot
  • Description: Capture accessibility snapshot of the current page, this is better than screenshot
  • Parameters: None
  • Read-only: true

• browser_take_screenshot
  • Title: Take a screenshot
  • Description: Take a screenshot of the current page. You can't perform actions based on the screenshot, use browser_snapshot for actions.
  • Parameters:
    • type (string, optional): Image format for the screenshot. Default is png.
    • filename (string, optional): File name to save the screenshot to. Defaults to page-{timestamp}.{png|jpeg} if not specified.
    • element (string, optional): Human-readable element description used to obtain permission to screenshot the element. If not provided, the screenshot will be taken of viewport. If element is provided, ref must be provided too.
    • ref (string, optional): Exact target element reference from the page snapshot. If not provided, the screenshot will be taken of viewport. If ref is provided, element must be provided too.
    • fullPage (boolean, optional): When true, takes a screenshot of the full scrollable page, instead of the currently visible viewport. Cannot be used with element screenshots.
  • Read-only: true

• browser_type
  • Title: Type text
  • Description: Type text into editable element
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot
    • text (string): Text to type into the element
    • submit (boolean, optional): Whether to submit entered text (press Enter after)
    • slowly (boolean, optional): Whether to type one character at a time. Useful for triggering key handlers in the page. By default entire text is filled in at once.
  • Read-only: false

• browser_wait_for
  • Title: Wait for
  • Description: Wait for text to appear or disappear or a specified time to pass
  • Parameters:
    • time (number, optional): The time to wait in seconds
    • text (string, optional): The text to wait for
    • textGone (string, optional): The text to wait for to disappear
  • Read-only: true

• browser_tab_close
  • Title: Close a tab
  • Description: Close a tab
  • Parameters:
    • index (number, optional): The index of the tab to close. Closes current tab if not provided.
  • Read-only: false

• browser_tab_list
  • Title: List tabs
  • Description: List browser tabs
  • Parameters: None
  • Read-only: true

• browser_tab_new
  • Title: Open a new tab
  • Description: Open a new tab
  • Parameters:
    • url (string, optional): The URL to navigate to in the new tab. If not provided, the new tab will be blank.
  • Read-only: true

• browser_tab_select
  • Title: Select a tab
  • Description: Select a tab by index
  • Parameters:
    • index (number): The index of the tab to select
  • Read-only: true

• browser_install
  • Title: Install the browser specified in the config
  • Description: Install the browser specified in the config. Call this if you get an error about the browser not being installed.
  • Parameters: None
  • Read-only: false

• browser_mouse_click_xy
  • Title: Click
  • Description: Click left mouse button at a given position
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • x (number): X coordinate
    • y (number): Y coordinate
  • Read-only: false

• browser_mouse_drag_xy
  • Title: Drag mouse
  • Description: Drag left mouse button to a given position
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • startX (number): Start X coordinate
    • startY (number): Start Y coordinate
    • endX (number): End X coordinate
    • endY (number): End Y coordinate
  • Read-only: false

• browser_mouse_move_xy
  • Title: Move mouse
  • Description: Move mouse to a given position
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • x (number): X coordinate
    • y (number): Y coordinate
  • Read-only: true

• browser_pdf_save
  • Title: Save as PDF
  • Description: Save page as PDF
  • Parameters:
    • filename (string, optional): File name to save the pdf to. Defaults to page-{timestamp}.pdf if not specified.
  • Read-only: true