Puppeteer Real Browser MCP Server

Provides AI assistants with powerful, detection-resistant browser automation capabilities built on ZFC Digital's puppeteer-real-browser package.

Quick Start for Beginners
Introduction
Features
Prerequisites
Installation
Usage
Available Tools
Advanced Features
Configuration
Troubleshooting
Development
Testing
Contributing
License

Quick Start for Beginners

What is this?

This is an MCP (Model Context Protocol) server that lets AI assistants like Claude control a real web browser. Think of it as giving Claude "hands" to interact with websites - it can click buttons, fill forms, extract content, and much more, all while avoiding bot detection.

Important: You DON'T Need to Install This Package!

If you're just using this MCP server (not developing it), you don't need to run npm install. The npx command in the configuration will automatically download and run the latest version for you. Installation is only required for development purposes.

Step-by-Step Setup

1. Install Node.js (Required)

Go to nodejs.org
Download and install Node.js (version 18 or higher)
Verify installation by opening terminal/command prompt and typing: node --version

2. Configure Claude Desktop

For Windows:

Open File Explorer and navigate to: %APPDATA%\Claude\
Open (or create) claude_desktop_config.json
Add this configuration:

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"]
    }
  }
}

For Mac:

Open Finder and press Cmd+Shift+G
Go to: ~/Library/Application Support/Claude/
Open (or create) claude_desktop_config.json
Add the same configuration as above

For Linux:

Navigate to: ~/.config/Claude/
Open (or create) claude_desktop_config.json
Add the same configuration as above

Why @latest? The @latest tag ensures you always get the most recent version with bug fixes and improvements. The npx command automatically downloads and runs it without installing anything permanently on your system.

3. Restart Claude Desktop

Close and reopen Claude Desktop completely.

4. Test It Works

In Claude Desktop, try saying:

"Initialize a browser and navigate to google.com, then get the page content"

If everything is working, Claude should be able to:

Start a browser
Navigate to Google
Extract and show you the page content

What Can You Do With It?

Once set up, you can ask Claude to:

Browse websites: "Go to amazon.com and search for laptops"
Fill forms: "Fill out this contact form with my details"
Extract data: "Get all the product prices from this page"
Automate tasks: "Log into my account and download my invoice"
Solve captchas: "Handle any captchas that appear"

Safety Notes

Claude will show you what it's doing - you can see the browser window
Always review what Claude does before approving sensitive actions
Use headless mode (headless: true) if you don't want to see the browser window
Be respectful of websites' terms of service

Introduction

The Puppeteer Real Browser MCP Server acts as a bridge between AI assistants and browser automation. It leverages puppeteer-real-browser to provide stealth browsing capabilities that can bypass common bot detection mechanisms.

This server implements the Model Context Protocol (MCP), allowing AI assistants to control a real browser, extract content, and more.

Features

Stealth by default: All browser instances use anti-detection features
Enhanced Windows support: Comprehensive Chrome detection and ECONNREFUSED error fixes (v1.3.0)
Smart Chrome detection: Registry-based detection + 15+ installation paths (Windows)
Connection resilience: Automatic localhost/127.0.0.1 fallback with port management
Multiple retry strategies: 5 different connection approaches with progressive fallback
Advanced configuration: Full support for all puppeteer-real-browser options
Dynamic selector discovery: Intelligent element finding without hardcoded selectors
Random scrolling: Tools for natural scrolling to avoid detection
Comprehensive toolset: 11 tools covering all browser automation needs
Proxy support: Built-in proxy configuration for enhanced privacy
Captcha handling: Support for solving reCAPTCHA, hCaptcha, and Turnstile
Robust error handling: Advanced error recovery with circuit breaker pattern
Stack overflow protection: Comprehensive protection against infinite recursion
Timeout controls: Automatic timeout mechanisms prevent hanging operations
Platform optimization: Windows-specific flags and longer timeouts for better compatibility

Prerequisites

Node.js >= 18.0.0
npm or yarn
Google Chrome or Chromium browser installed
Basic understanding of TypeScript/JavaScript (for development)

Platform-Specific Requirements

Windows:

Google Chrome installation (automatic detection in v1.3.0+ includes):
- Standard installations: C:\Program Files\Google\Chrome\Application\chrome.exe
- 32-bit installations: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
- User installations: %LOCALAPPDATA%\Google\Chrome\Application\chrome.exe
- Chrome Canary: %LOCALAPPDATA%\Google\Chrome SxS\Application\chrome.exe
- Portable installations and Registry-detected paths
- Manual path specification: Use CHROME_PATH environment variable

macOS:

Google Chrome or Chromium must be installed in /Applications/

Linux:

Install Chrome/Chromium: sudo apt-get install -y google-chrome-stable or sudo apt-get install -y chromium-browser
Install xvfb for headless operation: sudo apt-get install -y xvfb

Installation for Developers

Note for Claude Desktop Users: You don't need to install anything! The npx command in your configuration automatically handles everything. Skip to the Usage section.

This section is for developers who want to:

Contribute to the project
Run the server locally for development
Create custom modifications

Global Installation (For Command Line Usage)

If you want to run the server directly from the command line without using npx:

npm install -g puppeteer-real-browser-mcp-server@latest

After global installation, you can run:

puppeteer-real-browser-mcp-server

Development Setup (For Contributors)

# Clone the repository
git clone https://github.com/withLinda/puppeteer-real-browser-mcp-server.git
cd puppeteer-real-browser-mcp-server

# Install dependencies
npm install

# Build the project
npm run build

# Run in development mode
npm run dev

Usage

With Claude Desktop

The configuration below uses npx to automatically download and run the latest version. No installation required!

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"]
    }
  }
}

What does npx do? The npx command downloads and runs the package without permanently installing it. The @latest ensures you always get the newest version with all bug fixes and improvements.

With Claude Code CLI

Claude Code CLI offers multiple convenient methods to add the puppeteer-real-browser MCP server. Choose the method that best fits your workflow:

Method 1: Quick Setup (Recommended)

The fastest way to get started is using the claude mcp add command:

claude mcp add puppeteer-real-browser -- npx puppeteer-real-browser-mcp-server@latest

This command:

Adds the server to your local scope (available only to you in current project)
Uses npx to automatically download and run the latest version
No installation required - everything is handled automatically

Method 2: Add with Environment Variables

If you need to configure proxy settings or custom Chrome paths:

claude mcp add puppeteer-real-browser \
  -e CHROME_PATH="/path/to/chrome" \
  -e PROXY_URL="http://proxy:8080" \
  -- npx puppeteer-real-browser-mcp-server@latest

Method 3: Scoped Configuration

For User-Wide Access (Available Across All Projects):

claude mcp add puppeteer-real-browser -s user -- npx puppeteer-real-browser-mcp-server@latest

For Project-Wide Access (Shared with Team via .mcp.json):

claude mcp add puppeteer-real-browser -s project -- npx puppeteer-real-browser-mcp-server@latest

Method 4: JSON Configuration

For advanced users who want precise control:

claude mcp add-json puppeteer-real-browser '{
  "type": "stdio",
  "command": "npx",
  "args": ["puppeteer-real-browser-mcp-server@latest"],
  "env": {
    "CHROME_PATH": "/path/to/chrome",
    "PROXY_URL": "http://proxy:8080"
  }
}'

Verification and Testing

After adding the server:

Check MCP Server Status:
```
/mcp
```
This command in Claude Code shows all active MCP servers.
Test the Server: In Claude Code, try:

"Initialize a browser and navigate to google.com, then get the page content"

If working correctly, you should see:
- Browser initialization
- Navigation to Google
- Page content extracted and displayed

Configuration Scopes Explained

Scope	Description	Config Location	Use Case
local (default)	Available only to you in current project	`.mcp.json` in project	Testing, project-specific
project	Shared with entire team	`.mcp.json` committed to repo	Team collaboration
user	Available to you across all projects	User config directory	Personal productivity

Benefits of Claude Code CLI

Automatic Updates: Using @latest ensures you get bug fixes and improvements
No Installation: npx handles downloading and running automatically
Environment Variables: Easy configuration of proxies, Chrome paths, etc.
Scope Control: Choose where the server is available (local/project/user)
Team Sharing: Project scope allows sharing configurations with teammates
Status Monitoring: Built-in /mcp command for server health checks

With Cursor IDE

Cursor IDE uses the same npx approach - no installation needed! Here are the setup methods:

Method 1: One-Click Installation (Recommended)

Open Cursor IDE
Open Command Palette (Ctrl+Shift+P on Windows/Linux, Cmd+Shift+P on Mac)
Search for "Cursor Settings" and select it
Click on "MCP" in the sidebar
Browse curated MCP servers and install browser automation tools with one-click
OAuth authentication will be handled automatically

Method 2: Manual Configuration

Configuration File Location:

Project-specific: Create .cursor/mcp.json in your project directory
Global: Create ~/.cursor/mcp.json in your home directory

Basic Configuration (No Installation Required):

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"]
    }
  }
}

Important: Just like Claude Desktop, Cursor will use npx to automatically download and run the server. You don't need to install anything with npm!

Windows-Specific Configuration (if experiencing Chrome path issues):

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"],
      "env": {
        "CHROME_PATH": "C:/Program Files/Google/Chrome/Application/chrome.exe"
      }
    }
  }
}

Note: Browser options like headless mode should be configured when initializing the browser through the browser_init tool, not via environment variables.

Advanced Configuration with Custom Chrome Path:

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"],
      "env": {
        "CHROME_PATH": "C:/Program Files/Google/Chrome/Application/chrome.exe"
      }
    }
  }
}

Note: Proxy settings and browser options should be configured when asking Claude to initialize the browser using the browser_init tool.

Platform-Specific Chrome Paths for Cursor IDE

If Chrome auto-detection fails, you can specify the Chrome path using the CHROME_PATH environment variable:

Windows:

"env": {
  "CHROME_PATH": "C:/Program Files/Google/Chrome/Application/chrome.exe"
}

Alternative Windows paths:

"C:/Program Files (x86)/Google/Chrome/Application/chrome.exe"
"%LOCALAPPDATA%/Google/Chrome/Application/chrome.exe"

macOS:

"env": {
  "CHROME_PATH": "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
}

Linux:

"env": {
  "CHROME_PATH": "/usr/bin/google-chrome"
}

Alternative Linux paths: /usr/bin/chromium-browser, /snap/bin/chromium

Testing Cursor IDE Setup

After configuration:

Restart Cursor IDE completely
Open a new chat
Test with: "Initialize a browser and navigate to google.com, then get the page content"

If successful, you should see:

Browser window opening
Navigation to Google
Page content extracted and displayed in the chat

Cursor IDE Troubleshooting

Common Issues:

"MCP server not found"
- Verify config file location and JSON syntax
- Use jsonlint.com to validate JSON
- Ensure Node.js 18+ is installed
"Browser failed to launch" on Windows
- Add explicit Chrome path in executablePath
- Try running Cursor IDE as Administrator
- Check Windows Defender isn't blocking Chrome
"Permission denied"
- Use sudo npm install -g puppeteer-real-browser-mcp-server on Linux/Mac
- Run Command Prompt as Administrator on Windows
Configuration not loading
- Ensure file is named exactly mcp.json (not mcp.json.txt)
- Check file is in correct directory
- Restart Cursor IDE after changes

With Other AI Assistants

Start the server:

puppeteer-real-browser-mcp-server

Or if installed from source:

npm start

The server communicates via stdin/stdout using the MCP protocol.

Example Interactions

Basic Web Browsing

User: "Initialize a browser and navigate to example.com"
AI: I'll initialize a stealth browser and navigate to the website.
[Uses browser_init and navigate tools]

Form Automation

User: "Fill in the search form with 'test query'"
AI: I'll type that into the search field.
[Uses type tool with selector and text]

User: "Click the search button"
AI: I'll click the search button.
[Uses click tool]

Data Extraction

User: "Get all the product names from this e-commerce page"
AI: I'll extract the product information from the page.
[Uses get_content tool with appropriate selectors]

User: "Save the page content as text"
AI: I'll get the text content of the entire page.
[Uses get_content tool with type: 'text']

Working with Proxies

User: "Initialize a browser with a proxy server"
AI: I'll set up the browser with your proxy configuration.
[Uses browser_init with proxy: "https://proxy.example.com:8080"]

Available Tools

Core Browser Tools

Tool Name	Description	Required Parameters	Optional Parameters
`browser_init`	Initialize stealth browser with advanced options	None	`headless`, `disableXvfb`, `ignoreAllFlags`, `proxy`, `plugins`, `connectOption`
`navigate`	Navigate to a URL	`url`	`waitUntil`
`get_content`	Get page content (HTML or text)	None	`type`, `selector`
`browser_close`	Close the browser instance	None	None

Interaction Tools

Tool Name	Description	Required Parameters	Optional Parameters
`click`	Standard click on element	`selector`	`waitForNavigation`
`type`	Type text into input field	`selector`, `text`	`delay`
`wait`	Wait for various conditions	`type`, `value`	`timeout`
`find_selector`	Find CSS selector for element containing specific text	`text`	`elementType`, `exact`

Behavior Tools

Tool Name	Description	Required Parameters	Optional Parameters
`random_scroll`	Perform random scrolling with natural timing	None	None

Element Discovery Tools

Tool Name	Description	Required Parameters	Optional Parameters
`find_selector`	Find CSS selector for element containing specific text	`text`	`elementType`, `exact`

Anti-Detection Tools

Tool Name	Description	Required Parameters	Optional Parameters
`solve_captcha`	Attempt to solve captchas	`type`	None

Advanced Features

Dynamic Selector Discovery

The server includes intelligent element discovery capabilities through the find_selector tool:

Text-based element finding: Automatically locates elements containing specific text
Smart CSS selector generation: Creates unique, robust CSS selectors similar to Chrome DevTools
Element type filtering: Optionally restrict search to specific HTML elements (e.g., buttons, links)
Exact or partial text matching: Choose between precise text matching or substring searches
Universal compatibility: Works across any website without hardcoded selectors

Example Usage:

User: "Find the submit button that says 'Sign Up'"
AI: I'll locate that button for you.
[Uses find_selector with text: "Sign Up", elementType: "button"]

AI: Found button at selector: "form > button.btn-primary:nth-of-type(2)"

This approach eliminates the need for manually crafted selectors and makes automation more reliable across different websites.

Natural Interactions

The server includes tools designed for natural browsing behavior:

Random scrolling: Performs scrolling with natural timing and variable distances

This feature helps avoid detection by sophisticated bot-detection systems that analyze user behavior patterns.

Captcha Handling

The server includes basic support for solving common captcha types:

reCAPTCHA
hCaptcha
Cloudflare Turnstile

Note that captcha solving capabilities depend on the underlying puppeteer-real-browser implementation.

Configuration

Automatic Chrome Path Detection (Enhanced in v1.3.0)

The server automatically detects Chrome installation paths across different operating systems with significantly improved Windows support:

Windows (v1.3.0+):
- Registry-based detection for installed Chrome versions
- Searches 15+ common installation directories including Program Files, user-specific locations, and portable installations
- Support for Chrome Canary fallback
- Environment variable detection (CHROME_PATH, PUPPETEER_EXECUTABLE_PATH)
- Detailed troubleshooting guidance when Chrome is not found
macOS: Looks for Chrome in /Applications/Google Chrome.app/ and Chrome Canary locations
Linux: Checks multiple locations including /usr/bin/google-chrome, /usr/bin/chromium-browser, and snap installations

Windows Registry Detection (NEW in v1.3.0): The server now queries Windows Registry to find Chrome installations, making detection more reliable across different installation types.

If Chrome is not found automatically, you can specify a custom path using:

Environment variable: set CHROME_PATH="C:\Your\Chrome\Path\chrome.exe"
Browser init option: customConfig.chromePath when initializing the browser

Configuring Custom Options (like headless mode)

Custom options like headless mode are not configured in the MCP config file. Instead, they're passed when initializing the browser using the browser_init tool:

When you ask Claude to initialize a browser, you can specify options like:

Please initialize a browser with headless mode enabled and a 30-second timeout

Claude will then use the browser_init tool with appropriate parameters:

{
  "headless": true,
  "connectOption": {
    "timeout": 30000
  }
}

Available Browser Options

When initializing with browser_init, you can configure:

headless: true/false (Set to true for headless operation)
disableXvfb: true/false (Disable X Virtual Framebuffer)
ignoreAllFlags: true/false (Ignore all Chrome flags)
proxy: "https://proxy:8080" (Proxy server URL)
plugins: ["plugin1", "plugin2"] (Array of plugins to load)
connectOption: Additional connection options like:
- slowMo: 250 (Slow down operations by milliseconds)
- timeout: 60,000 (Connection timeout)

The MCP config file only tells Claude where to find the server - all browser-specific options are configured through your conversations with Claude.

Browser Options Example

When initializing the browser with browser_init, you can configure:

{
  "headless": false,
  "disableXvfb": false,
  "ignoreAllFlags": false,
  "proxy": "https://proxy:8080",
  "plugins": ["plugin1", "plugin2"],
  "connectOption": {
    "slowMo": 250,
    "timeout": 60000
  }
}

Advanced Configuration Examples

Specifying Custom Chrome Path

{
  "customConfig": {
    "chromePath": "C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe"
  }
}

Using a Proxy

{
  "headless": true,
  "proxy": "https://username:password@proxy.example.com:8080"
}

Stealth Mode with Custom Options

{
  "headless": false,
  "ignoreAllFlags": true,
  "disableXvfb": false,
  "connectOption": {
    "slowMo": 100,
    "devtools": false
  }
}

Server Configuration

For advanced users, you can modify the server behavior by editing the source code:

Change default viewport size in the initializeBrowser function
Adjust timeout values for various operations
Enable debug logging

Troubleshooting

Major Windows Connection Issues (Fixed in v1.3.0)

🔧 ECONNREFUSED Error Solutions

Version 1.3.0 includes comprehensive fixes for the connect ECONNREFUSED 127.0.0.1:60725 error commonly experienced on Windows systems:

Enhanced Chrome Path Detection:

Added Windows Registry-based Chrome detection
Expanded search to 15+ Windows installation locations including portable installations
Added support for Chrome Canary fallback
Environment variable support (CHROME_PATH, PUPPETEER_EXECUTABLE_PATH)

Windows-Specific Launch Optimizations:

20+ Windows-specific Chrome flags for better compatibility
Multiple fallback strategies (5 different connection approaches)
Progressive retry logic with exponential backoff
Enhanced timeout handling (120s for Windows vs 90s for other platforms)

Connection Resilience Features:

Localhost vs 127.0.0.1 fallback handling (fixes known Puppeteer issue)
Port availability checking and automatic port assignment
Network connectivity testing before browser launch
Enhanced error categorization and automatic fallback strategies

If you're still experiencing ECONNREFUSED errors:

Environment Variables (Recommended):

set CHROME_PATH="C:\Program Files\Google\Chrome\Application\chrome.exe"

Manual Chrome Path Configuration:

Ask Claude: "Initialize browser with custom Chrome path at C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe"

Network Troubleshooting:

# Test localhost resolution
ping localhost
# Should resolve to 127.0.0.1

# Check Windows hosts file
notepad C:\Windows\System32\drivers\etc\hosts
# Ensure: 127.0.0.1 localhost

Chrome Process Management:

# Kill existing Chrome processes
taskkill /f /im chrome.exe

Common Issues

npx-Specific Issues

"spawn npx ENOENT" or "command not found" errors
- Cause: npx is not in your system PATH or Node.js is not properly installed
- Solutions:
  - Verify Node.js installation: node --version and npm --version
  - Reinstall Node.js from nodejs.org
  - For NVM users, see the NVM-specific section below
"npx: command not found" in Claude Desktop/Cursor
- Windows: Make sure to restart your IDE after installing Node.js
- Mac/Linux: Add npm to PATH: export PATH="$PATH:$(npm bin -g)"
- Alternative: Use the full path to npx: /usr/local/bin/npx
npx hangs or takes too long
- npx downloads the package on first run, which can take 30-60 seconds
- Ensure you have a stable internet connection
- Try clearing npm cache: npm cache clean --force

Using NVM (Node Version Manager)?

Standard npx commands may fail with NVM

Solution 1: Use absolute paths in your config:

{
  "mcpServers": {
    "puppeteer-real-browser": {
      "command": "/Users/yourname/.nvm/versions/node/v20.0.0/bin/npx",
      "args": ["puppeteer-real-browser-mcp-server@latest"]
    }
  }
}

Solution 2: Set a default Node version: nvm alias default 20.0.0

Permission denied errors with npx
- Mac/Linux: Try with sudo: sudo npx puppeteer-real-browser-mcp-server@latest
- Better solution: Fix npm permissions: npm config set prefix ~/.npm

Other Common Issues

"Maximum call stack size exceeded" errors
- This was fixed in version 1.2.0 with comprehensive stack overflow protection
- The server now includes circuit breaker patterns and recursion depth tracking
- Timeout controls prevent hanging operations that could lead to stack overflow
- If you encounter this error, ensure you're using the latest version: npx puppeteer-real-browser-mcp-server@latest
"command not found" or "syntax error" when using npx
- This was fixed in version 1.0.3 with the addition of a proper shebang line
- Make sure you're using the latest version: npx puppeteer-real-browser-mcp-server@latest
- For global installation: npm install -g puppeteer-real-browser-mcp-server@latest
- If still having issues, install globally: npm install -g puppeteer-real-browser-mcp-server
- Check your PATH includes npm global binaries: npm config get prefix
Browser won't start
- Check if Chrome/Chromium is installed in standard locations
- Windows specific troubleshooting:
  
  Step 1: Verify Chrome Installation Paths Check these locations in order:
  - C:\Program Files\Google\Chrome\Application\chrome.exe
  - C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
  - %LOCALAPPDATA%\Google\Chrome\Application\chrome.exe
  - %PROGRAMFILES%\Google\Chrome\Application\chrome.exe
  Step 2: Manual Path Configuration If Chrome is in a different location, specify it manually:
```
Ask Claude: "Initialize browser with custom Chrome path at C:\Your\Chrome\Path\chrome.exe"
```
  Step 3: Windows Launch Arguments For Windows compatibility, use these launch arguments:
```
Ask Claude: "Initialize browser with args --disable-gpu --disable-setuid-sandbox"
```
  Step 4: Windows-Specific Solutions
  - Run as Administrator: Try running your IDE/terminal as Administrator
  - Windows Defender: Add Chrome and Node.js to Windows Defender exclusions
  - Antivirus Software: Temporarily disable antivirus to test if it's blocking Chrome
  - User Account Control: Lower UAC settings temporarily for testing
  - Chrome Processes: Kill any existing Chrome processes in Task Manager
  Step 5: Alternative Chrome Installation If Chrome detection still fails:
  - Download Chrome directly from google.com/chrome
  - Install to default location (C:\Program Files\Google\Chrome\)
  - Restart your IDE after installation
  Step 6: PowerShell vs Command Prompt Try switching between PowerShell and Command Prompt:
  - Test with cmd.exe instead of PowerShell
  - Test with PowerShell instead of Command Prompt
  Step 7: Node.js and npm Configuration
  - Ensure Node.js is added to PATH: node --version
  - Clear npm cache: npm cache clean --force
  - Reinstall global packages: npm install -g puppeteer-real-browser-mcp-server@latest
- Linux: Install dependencies: sudo apt-get install -y google-chrome-stable
- macOS: Ensure Chrome is in /Applications/
- Try with headless: true first
- Check console output for Chrome path detection messages
Claude doesn't see the MCP server
- Verify claude_desktop_config.json is in the correct location
- Check JSON syntax is valid (use jsonlint.com)
- Restart Claude Desktop completely
- Check for any error messages in Claude Desktop

4a. Claude Code CLI doesn't see the MCP server

Installation Issues:
- Verify claude mcp add command was successful
- Check command syntax: claude mcp add puppeteer-real-browser -- npx puppeteer-real-browser-mcp-server@latest
- Ensure you have the latest Claude Code CLI version
Scope and Configuration:
- Check which scope you used: local (default), project, or user
- For local scope: ensure you're in the correct project directory
- For project scope: verify .mcp.json exists in project root
- For user scope: check user config directory
MCP Server Status:
- Use /mcp command in Claude Code to check server status
- Look for the "puppeteer-real-browser" server in the list
- Check if server status shows "connected" or error messages
Environment Variables:
- If using custom environment variables (Chrome path, proxy), verify they're correctly set
- Test without environment variables first: claude mcp add puppeteer-real-browser -- npx puppeteer-real-browser-mcp-server@latest
Node.js and npx Issues:
- Verify Node.js version 18+: node --version
- Test npx directly: npx puppeteer-real-browser-mcp-server@latest
- Clear npm cache: npm cache clean --force
Protocol Version Issues (Known Issue):
- Claude CLI may show protocolVersion validation errors despite correct configuration
- This is a known issue with internal validation in Claude CLI
- Server may still work despite validation warnings

Re-adding Server:

# Remove and re-add if issues persist
claude mcp remove puppeteer-real-browser
claude mcp add puppeteer-real-browser -- npx puppeteer-real-browser-mcp-server@latest

4b. Cursor IDE doesn't see the MCP server

Config File Location Issues:
- Verify mcp.json is in the correct location:
  - Global: ~/.cursor/mcp.json (%USERPROFILE%\.cursor\mcp.json on Windows)
  - Project: .cursor/mcp.json in your project root
- Ensure filename is exactly mcp.json (not mcp.json.txt)
- Check file permissions allow reading
JSON Syntax Validation:
- Use jsonlint.com to validate JSON syntax
- Common issues: missing commas, incorrect quotes, trailing commas
- Ensure proper escaping of Windows paths: "C:/Program Files/Google/Chrome/Application/chrome.exe"
Cursor IDE Restart Process:
- Close Cursor IDE completely (check Task Manager on Windows)
- Wait 5 seconds
- Restart Cursor IDE
- Open Command Palette and check MCP servers are listed
Environment Variables:
- Verify Node.js is accessible: node --version
- Check PATH includes npm: npm --version
- Clear any conflicting environment variables
Cursor IDE Version Compatibility:
- Ensure Cursor IDE version supports MCP (latest versions)
- Update Cursor IDE if using an older version
- Check Cursor IDE documentation for MCP requirements

Permission denied errors
- On Linux/Mac: Try sudo npm install -g puppeteer-real-browser-mcp-server
- Or use nvm to manage Node.js without sudo
- On Windows: Run command prompt as Administrator
Detection issues
- Use appropriate delays between actions for better reliability
- Add random delays with random_scroll
- Use proxy if needed: proxy: "http://proxy.example.com:8080"
Memory leaks
- Always close browser instances with browser_close when done
- Don't initialize multiple browsers without closing previous ones
- Check for uncaught exceptions that might prevent cleanup
Timeout errors
- Increase timeout values: { "timeout": 60000 }
- Use wait tool before interacting with elements
- Check network connectivity and website response times

Frequently Asked Questions

Q: When should I use npm install vs npx? A:

Use npx (recommended for most users): When using with Claude Desktop, Claude Code CLI, or Cursor IDE. The npx command in your config automatically downloads and runs the latest version without installation.
Use npm install -g: Only if you want to run the server directly from command line frequently, or if you're developing/contributing to the project.
Never needed: If you're just a Claude Desktop/Claude Code CLI user following the Quick Start guide - npx handles everything!

Q: Should I use Claude Desktop or Claude Code CLI? A: Both are excellent choices, depending on your needs:

Claude Desktop:

Best for: Simple web browsing automation, content extraction, basic form filling
Setup: Manual JSON config file editing
Sharing: Individual use only
Interface: Desktop GUI application
Authentication: None required

Claude Code CLI:

Best for: Development workflows, team collaboration, project-specific automation
Setup: Simple command-line setup (claude mcp add)
Sharing: Supports team sharing via project scope
Interface: Command-line integration with IDEs
Authentication: OAuth support available
Advanced Features: Environment variables, scope control, server monitoring

Use Claude Code CLI if you:

Work in development teams
Need project-specific browser automation
Want environment variable configuration
Prefer command-line workflows
Need server health monitoring

Use Claude Desktop if you:

Want a simple GUI experience
Do individual browsing automation
Don't need team collaboration features
Prefer visual interfaces over command-line

Q: Why do we use @latest in the npx command? A: The @latest tag ensures you always get the newest version with bug fixes and security updates. Without it, npx might cache an older version. It's especially important for actively maintained projects.

Q: Does this work with headless browsers? A: Yes, set headless: true in browser_init options.

Q: Can I use multiple browsers at once? A: Currently supports one browser instance. Close the current one before starting a new one.

Q: What captchas can it solve? A: Supports reCAPTCHA, hCaptcha, and Cloudflare Turnstile through puppeteer-real-browser.

Q: Is this detectable by websites? A: puppeteer-real-browser includes anti-detection features, but no solution is 100% undetectable.

Q: Can I use custom Chrome extensions? A: Yes, through the plugins option in browser_init.

Q: Does it work on all operating systems? A: Yes, tested on Windows, macOS, and Linux. The server automatically detects Chrome installations on all platforms.

Q: What's the difference between Claude Desktop, Claude Code CLI, and Cursor IDE configurations? A: Here's a comparison:

Feature	Claude Desktop	Claude Code CLI	Cursor IDE
Setup Method	Manual JSON editing	Command-line (`claude mcp add`)	One-click install OR manual JSON
Config Location	`claude_desktop_config.json`	`.mcp.json` (scoped)	`.cursor/mcp.json`
Team Sharing	No	Yes (project scope)	Yes
Environment Variables	Limited support	Full support	Full support
Scope Control	No	Yes (local/project/user)	Project/Global
Server Monitoring	No	Yes (`/mcp` command)	Limited
Authentication	None	OAuth available	OAuth available
Best For	Individual GUI use	Development teams	Code-focused workflows

Command Examples:

Claude Desktop: Edit config file with JSON
Claude Code CLI: claude mcp add puppeteer-real-browser -- npx puppeteer-real-browser-mcp-server@latest
Cursor IDE: One-click install or manual JSON config

Q: What if Chrome is installed in a non-standard location? A: Version 1.3.0 dramatically improves Chrome detection. The server now searches 15+ locations including portable installations and uses Windows Registry detection. If Chrome is still not found automatically, you can:

Set environment variable: set CHROME_PATH="C:\Your\Chrome\Path\chrome.exe"
Use the customConfig.chromePath option: {"customConfig": {"chromePath": "C:\\Custom\\Chrome\\chrome.exe"}}

Q: Why am I getting "Chrome not found" or ECONNREFUSED errors on Windows? A: Version 1.3.0 includes comprehensive fixes for Windows Chrome detection and connection issues. The server now automatically searches these locations and more:

C:\Program Files\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
%LOCALAPPDATA%\Google\Chrome\Application\chrome.exe
%USERPROFILE%\AppData\Local\Google\Chrome\Application\chrome.exe
Chrome Canary installations
Portable Chrome installations
Registry-detected installations

The server also implements multiple connection strategies with automatic fallback between localhost and 127.0.0.1, plus enhanced Windows-specific Chrome flags for better compatibility.

Q: I'm still getting ECONNREFUSED errors after upgrading to v1.3.0. What should I do? A: Try these steps in order:

Set the CHROME_PATH environment variable to your Chrome location
Kill all existing Chrome processes: taskkill /f /im chrome.exe
Check your Windows hosts file contains: 127.0.0.1 localhost
Try running your IDE as Administrator
Add Chrome to Windows Defender exclusions
If using a VPN/proxy, try disabling it temporarily

Debug Mode

To enable debug logging:

DEBUG=true npm start

Or when running from source:

DEBUG=true npm run dev

Getting Help

If you're still having issues:

Check the GitHub Issues
Create a new issue with:
- Your operating system
- Node.js version (node --version)
- npm version (npm --version)
- Full error message
- Steps to reproduce the problem

Development

Project Structure

puppeteer-real-browser-mcp-server/
├── src/
│   ├── index.ts         # Main server implementation
│   └── stealth-actions.ts # Browser interaction functions
├── test/
│   └── test-server.ts   # Test script
├── package.json
└── tsconfig.json

Building from Source

# Install dependencies
npm install

# Run in development mode
npm run dev

# Build for production
npm run build

# Test the server
npm test

Adding New Tools

To add a new tool:

Add the tool definition to the TOOLS array in src/index.ts
Implement the tool handler in the CallToolRequestSchema handler
Test the new tool functionality

Testing

This project includes a comprehensive testing suite with multiple categories optimized for different purposes:

Quick Tests (CI/CD) - ~30 seconds

npm run test:quick    # Fast Jest tests for protocol compliance
npm test              # Alias for test:quick

Comprehensive Tests - ~5-10 minutes

npm run test:full     # End-to-end MCP client testing

Performance Testing - ~2-3 minutes

npm run test:performance  # Browser performance benchmarking

Performance tests measure:

Browser initialization timing (5 trials)
Navigation performance across different site types
Concurrent operation handling
Session longevity testing (30+ operations over 30 seconds)

Debug Tools - ~10 seconds

npm run test:debug    # Environment diagnostics and troubleshooting

Debug tools provide:

Environment validation (Node.js version, platform, memory)
Chrome installation detection with specific paths
Quick server health check with startup timing
Network connectivity validation
Build status verification

All Tests - ~7-13 minutes

npm run test:all      # Runs quick + full + performance tests
npm run test:dashboard # Unified test runner with reporting

The test dashboard provides:

Unified execution of multiple test categories
Real-time progress reporting
Performance metrics and timing
Overall test status summary
Recommendations for failed tests
JSON results saved to test-results/ directory

Integration Testing

npm run test:integration  # Claude Code CLI integration testing

For detailed testing information, see TESTING.md.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Fork the repository
Create your feature branch (git checkout -b feature/amazing-feature)
Commit your changes (git commit -m 'Add some amazing feature')
Push to the branch (git push origin feature/amazing-feature)
Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

This MCP server is based on the excellent puppeteer-real-browser library by ZFC-Digital.

Thank you to the puppeteer-real-browser team for creating such a powerful and detection-resistant browser automation solution!

Puppeteer Real Browser