Julia Browser 🌐

A comprehensive Python-based CLI web browser with JavaScript support and modern web compatibility.

Julia Browser transforms command-line web browsing into a dynamic, intelligent experience with comprehensive JavaScript simulation and rendering capabilities.

Features

• Enhanced JavaScript Engine: Mozilla SpiderMonkey integration via PythonMonkey
• Modern Web Compatibility: Full HTML DOM API, CSS Object Model (CSSOM), and modern JavaScript APIs
• Interactive CLI Interface: Rich terminal interface with comprehensive web interaction support
• Advanced Navigation: Back/forward, bookmarks, history, and smart link following
• Intelligent Content Processing: Dynamic content filtering and clean markdown output
• Performance Optimizations: Caching, asynchronous execution, and connection pooling
• Real Web Interactions: Form submission, file uploads, authentication flows
• Multiple Output Formats: Markdown, HTML, and JSON rendering
• Responsive Design Detection: Breakpoint analysis and mobile-first patterns
• Web Components Support: Extracts content from custom elements and Shadow DOM
• CSS Generated Content: Captures ::before/::after pseudo-element text
• Modern Layout Support: Proper text flow for CSS Grid and Flexbox layouts
• Shadow DOM Access: Accesses encapsulated component content from modern frameworks

Installation

pip install julia-browser

Quick Start

Command Line Interface

Command Line Usage

# Browse a website
julia-browser browse https://example.com

# Start interactive mode
julia-browser interactive

# Render to different formats
julia-browser render https://api.github.com --format json

AI Agent SDK 🤖

Julia Browser includes a clean, simple AI Agent SDK that enables AI systems to control websites exactly like humans do - with direct, intuitive functions that mirror CLI browser commands.

Perfect for: Web automation, AI agents, research workflows, data collection, form automation, and human-like web interactions.

Simple Functions - Just Like CLI Commands

from julia_browser import AgentSDK

# Initialize AI agent
agent = AgentSDK()

# Open a website (like CLI 'browse' command)
result = agent.open_website("https://example.com")
print(f"Opened: {result['title']}")

# List interactive elements (like CLI 'elements' command)
elements = agent.list_elements()
print(f"Found {elements['total_clickable']} clickable elements")

# Type into input fields (like CLI 'type' command)
agent.type_text(1, "search query")

# Click buttons or links (like CLI 'click' command)
agent.click_element(1)

# Submit forms (like CLI form submission)
result = agent.submit_form()
print(f"Form submitted: {result['title']}")

Complete AI Agent SDK Functions

Core Website Functions:

• open_website(url) - Open any website and get page content
• list_elements() - List all clickable elements and input fields with numbers
• get_page_info() - Get current page title, URL, and full content
• search_page(term) - Search for text within the current page

Human-like Interactions:

• click_element(number) - Click buttons or links by their number
• type_text(field_number, text) - Type text into input fields by number
• submit_form() - Submit forms with typed data
• follow_link(number) - Navigate to links by their number

Page Navigation & Scrolling:

• scroll_down(chunks=1) - Scroll down to see more content (like browser scrolling)
• scroll_up(chunks=1) - Scroll up to see previous content
• scroll_to_top() - Jump to the top of the page
• scroll_to_bottom() - Jump to the bottom of the page
• get_scroll_info() - Get current scroll position and page info

Page Navigation:

• scroll_down(chunks=1) - Scroll down to see more content
• scroll_up(chunks=1) - Scroll up to see previous content
• scroll_to_top() - Jump to the top of the page
• scroll_to_bottom() - Jump to the bottom of the page
• get_scroll_info() - Get current scroll position and progress

Real-World Usage Examples

1. Simple Web Search:

agent = AgentSDK()

# Open search engine
agent.open_website("https://duckduckgo.com")

# Type search query into first input field
agent.type_text(1, "Python programming")

# Submit the form
result = agent.submit_form()
print(f"Search results: {result['title']}")

2. Form Automation:

agent = AgentSDK()

# Open a form page
agent.open_website("https://httpbin.org/forms/post")

# List all available elements
elements = agent.list_elements()
print(f"Found {elements['total_inputs']} input fields")

# Fill form fields by number
agent.type_text(1, "John Doe")      # First field
agent.type_text(2, "555-1234")      # Second field

# Submit the completed form
result = agent.submit_form()

3. Scrolling Through Long Pages:

agent = AgentSDK()

# Open a documentation site
agent.open_website("https://api.python.langchain.com/en/latest/langchain_api_reference.html")

# Check scroll info
info = agent.get_scroll_info()
print(f"Page has {info['total_elements']} content sections")
print(f"Currently at {info['progress_percentage']}% of page")

# Scroll down to see more content
result = agent.scroll_down(2)  # Scroll down 2 chunks
print(f"Viewing sections {result['visible_range']}")

# Jump to bottom for conclusions/references
bottom = agent.scroll_to_bottom()
print("Now viewing the end of the document")

# Go back to top to review
agent.scroll_to_top()

4. Website Navigation:

agent = AgentSDK()

# Open website
agent.open_website("https://example.com")

# List clickable elements
elements = agent.list_elements()
for button in elements['buttons']:
    print(f"Button {button['number']}: {button['text']}")

# Click the first link/button
result = agent.click_element(1)

# Search current page for specific content
search = agent.search_page("information")
print(f"Found '{search['search_term']}' {search['matches_found']} times")

AI Agent Response Format

All AI Agent SDK methods return structured dictionaries with consistent formats:

{
    'success': True,
    'page_title': 'Example Domain',
    'url': 'https://example.com',
    'markdown': '# Page Content...',
    'forms': 1,
    'buttons': 3,
    'inputs': 5,
    'links': 12,
    'matches_found': 2,
    'error': None
}

Burp Suite-Style Intercepting Proxy 🔍

Julia Browser includes a powerful HTTP/HTTPS intercepting proxy designed for AI agents to inspect and manipulate web traffic - similar to Burp Suite but super simple with no Python functions needed!

Proxy Features

• 🎯 Zero Code Interception: Use simple dictionaries - no Python functions required!
• Request Modification: Change headers, URLs, methods, and body data
• Response Modification: Alter response content, headers, and status codes
• Traffic Logging: Comprehensive logging with filtering support
• Declarative Rules: AI-friendly rule system using JSON-like dictionaries
• Security Testing: Analyze security headers and test API endpoints
• API Monitoring: Automatically detect and log API calls
• Zero Impact: Completely optional - all existing functions work with proxy disabled

Quick Start with Proxy

from julia_browser import AgentSDK

agent = AgentSDK()

# Start the intercepting proxy
agent.proxy_start()

# Browse websites - all traffic is automatically logged
agent.open_website("example.com")

# Get traffic logs
traffic = agent.proxy_get_traffic(limit=10)
print(f"Captured {traffic['traffic_count']} HTTP requests")

# View request/response details
for entry in traffic['traffic']:
    req = entry['request']
    resp = entry['response']
    print(f"{req['method']} {req['url']} → {resp['status_code']}")

# Stop proxy
agent.proxy_stop()

Simple Request Modification - No Python Functions Needed!

Just use dictionaries - perfect for AI agents:

agent = AgentSDK()
agent.proxy_start()

# Add authentication header to all API requests
agent.proxy_add_rule({
    "name": "add_auth",
    "type": "request",
    "match": {"url_contains": "api"},
    "actions": {"set_headers": {"Authorization": "Bearer token123"}}
})

# Now browse - auth header is automatically added to API requests
agent.open_website("api.example.com")

Simple Response Modification

Modify responses with simple dictionaries:

agent.proxy_start()

# Remove sensitive data from all JSON responses
agent.proxy_add_rule({
    "name": "privacy_filter",
    "type": "response",
    "match": {"content_type": "application/json"},
    "actions": {"find_replace": {"password": "***", "api_key": "***"}}
})

# Browse - responses are automatically cleaned
agent.open_website("dashboard.example.com")

Security Testing Example

agent = AgentSDK()
agent.proxy_start()

# Browse target website
agent.open_website("example.com")

# Analyze security headers
traffic = agent.proxy_get_traffic(limit=1)
headers = traffic['traffic'][0]['response']['headers']

security_headers = {
    'Strict-Transport-Security': 'HSTS',
    'Content-Security-Policy': 'CSP',
    'X-Frame-Options': 'Clickjacking Protection'
}

print("Security Analysis:")
for header, name in security_headers.items():
    if header in headers:
        print(f"✓ {name}: {headers[header]}")
    else:
        print(f"✗ {name}: Missing")

agent.proxy_stop()

Traffic Filtering Example

agent.proxy_start()

# Browse multiple sites
agent.open_website("example.com")
agent.open_website("api.github.com")

# Get only API traffic
api_traffic = agent.proxy_get_traffic(
    limit=50,
    filter={"url_contains": "api"}
)

# Get only POST requests
post_traffic = agent.proxy_get_traffic(
    limit=50,
    filter={"method": "POST"}
)

print(f"API requests: {api_traffic['traffic_count']}")
print(f"POST requests: {post_traffic['traffic_count']}")

Proxy API Reference

Proxy Control:

• proxy_start() - Enable traffic interception
• proxy_stop() - Disable traffic interception
• proxy_status() - Get proxy status and statistics
• proxy_get_traffic(limit, filter) - Retrieve traffic logs with optional filtering
• proxy_clear_traffic() - Clear all traffic logs

Simple Rule-Based Interception (Recommended for AI Agents):

• proxy_add_rule(rule_dict) - Add declarative rule using simple dictionary
• proxy_remove_rule(name) - Remove rule by name
• proxy_list_rules() - List all active rules

Advanced Interception (For Power Users):

• proxy_add_request_interceptor(func, name) - Add Python function as request interceptor
• proxy_add_response_interceptor(func, name) - Add Python function as response interceptor
• proxy_remove_interceptor(name) - Remove interceptor by name
• proxy_list_interceptors() - List all active interceptors

Rule Configuration Reference

Match Conditions (for filtering):

• url_contains: Match URLs containing specific text
• url_matches: Match URLs with regex pattern
• method: Match specific HTTP method (GET, POST, etc.)
• header_equals: Match specific header values
• header_contains: Match headers containing text
• status_code: Match response status code (responses only)
• content_type: Match content type (responses only)

Actions (for modification):

Request Actions:

• set_headers: Add or modify request headers
• remove_headers: Remove specific headers
• set_method: Change HTTP method
• rewrite_url: Rewrite URL with regex
• replace_body: Replace entire request body
• append_body: Append to request body
• find_replace: Find and replace text in request body
• block_request: Block request from being sent (returns 403)

Response Actions:

• set_headers: Add or modify response headers
• remove_headers: Remove specific headers
• set_status: Change HTTP status code
• replace_body: Replace entire response body
• append_body: Append to response body
• find_replace: Find and replace text in response body

Complete Rule Example:

# Complex rule with multiple conditions and actions
agent.proxy_add_rule({
    "name": "api_modifier",
    "type": "request",
    "match": {
        "url_contains": "api",
        "method": "POST",
        "header_contains": {"Content-Type": "json"}
    },
    "actions": {
        "set_headers": {
            "Authorization": "Bearer token123",
            "X-API-Version": "v2"
        },
        "set_method": "PUT"
    }
})

Traffic Analysis Example

agent = AgentSDK()
agent.proxy_start()

# Browse multiple pages
for site in ["example.com", "httpbin.org", "api.github.com"]:
    agent.open_website(site)

# Get comprehensive statistics
status = agent.proxy_status()
stats = status['proxy_status']['stats']

print(f"Total Requests: {stats['total_requests']}")
print(f"Total Responses: {stats['total_responses']}")
print(f"Modified Requests: {stats['modified_requests']}")
print(f"Modified Responses: {stats['modified_responses']}")

# Get detailed traffic log
traffic = agent.proxy_get_traffic(limit=20)
for entry in traffic['traffic']:
    print(f"{entry['request']['method']:4} {entry['request']['url']}")

agent.proxy_stop()

Integration with AI Systems

The AI Agent SDK is specifically designed for integration with AI frameworks and automation platforms:

LangChain Integration:

from julia_browser import AgentSDK
from langchain.tools import BaseTool

class JuliaBrowserTool(BaseTool):
    name = "julia_browser"
    description = "Navigate and interact with websites"
    
    def _run(self, url: str) -> str:
        agent = AgentSDK()
        result = agent.navigate(url)
        return result['markdown']

OpenAI Function Calling:

import openai
from julia_browser import AgentSDK

def browse_website(url: str):
    """Browse a website and return its content"""
    agent = AgentSDK()
    return agent.navigate(url)

# Register as OpenAI function
functions = [{
    "name": "browse_website",
    "description": "Browse and analyze website content",
    "parameters": {
        "type": "object",
        "properties": {
            "url": {"type": "string", "description": "Website URL to browse"}
        }
    }
}]

Autonomous Agent Workflows:

# Multi-step research workflow
agent = AgentSDK()

# Step 1: Search for information
agent.navigate("https://duckduckgo.com")
agent.fill_input(0, "artificial intelligence trends 2024")
agent.submit_form()

# Step 2: Follow first result
agent.follow_link(0)

# Step 3: Extract specific data
insights = agent.search_page("machine learning")
print(f"Found {insights['matches_found']} ML references")

# Step 4: Continue to related pages
elements = agent.get_elements()
if elements['links'] > 0:
    agent.follow_link(0)  # Follow related link

Why Choose Julia Browser AI Agent SDK?

• 🎯 Human-like Interaction: Functions mirror exactly how humans browse websites
• 🔢 Simple Numbering: All elements are numbered - just click_element(1), type_text(1, "hello")
• 📊 Clean Responses: Consistent JSON responses with success/error handling
• 🌐 Real Websites: Handles modern sites with JavaScript, forms, and dynamic content
• 🚀 Zero Setup: No browser installation or complex configuration needed
• ⚡ Direct Commands: Each function does exactly one thing, like CLI commands

Advanced Features

Python API

from julia_browser import BrowserEngine, BrowserSDK

# Initialize browser
sdk = BrowserSDK()

# Browse a website
result = sdk.browse_url("https://example.com")
print(result['markdown'])

# Interactive CLI
from julia_browser import CLIBrowser
browser = CLIBrowser()
browser.start_interactive_mode()

Interactive Mode Commands

• browse <url> - Navigate to a website
• elements - Show all interactive elements (buttons, links, forms)
• click <number> - Click on numbered elements
• type <text> - Type into input fields
• submit - Submit forms
• back/forward - Navigate browser history
• bookmark add <name> - Save bookmarks
• help - Show all commands

Advanced Features

JavaScript Support

• Full ES6+ compatibility with Mozilla SpiderMonkey
• React, Vue, Angular framework support
• Real API calls and network requests
• Modern browser API simulation

Web Interaction

• Smart form handling with real submission
• File upload support
• Authentication flows and session management
• Cookie handling and persistent sessions

Performance

• Intelligent caching with SQLite backend
• Asynchronous request handling
• Connection pooling and optimization
• Lazy loading for large websites

Examples

Browse and Interact

julia-browser interactive
> browse github.com
> elements
> click 1  # Click login button
> type username myuser
> type password mypass
> submit

API Integration

from julia_browser import BrowserSDK

sdk = BrowserSDK()

# Handle JSON APIs
result = sdk.browse_url("https://api.github.com/users/octocat")
user_data = result['json_data']

# Process forms
result = sdk.submit_form("https://httpbin.org/post", {
    "username": "test",
    "email": "test@example.com"
})

Requirements

• Python 3.8+
• PythonMonkey (Mozilla SpiderMonkey)
• Rich (terminal formatting)
• Click (CLI framework)
• BeautifulSoup4 (HTML parsing)
• Requests (HTTP client)

License

MIT License - see LICENSE file for details.

Contributing

Contributions welcome! Please read our contributing guidelines and submit pull requests to our GitHub repository.

Links

• Documentation
• GitHub Repository
• Issue Tracker
• PyPI Package