Extract JavaScript from Any Website

Curious about how a website works? Download all JavaScript files from any page. Our script extractor captures external JavaScript files, inline <script> blocks, and dynamically loaded modules. Useful for learning from production implementations, debugging issues, security auditing, analyzing third-party scripts on your own site, or understanding how modern web applications are architected.

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Features

Downloads all external JavaScript files from the page
Extracts inline <script> blocks including embedded code
Captures dynamically loaded scripts via dynamic import()
Shows script load order and dependencies where visible
Identifies common libraries like React, Vue, jQuery, and more
Detects bundled applications from Webpack, Vite, and Rollup
Extracts source maps when publicly accessible
Organizes scripts by type (external, inline, dynamic)

Why Extract JavaScript from Websites?

JavaScript powers modern web applications, and understanding how production sites implement their functionality is invaluable for developers. Our JavaScript extractor gives you direct access to the client-side code running on any website. The extraction process is comprehensive. We capture externally linked script files, inline code embedded in the HTML, and even scripts loaded dynamically after page load. Modern bundled applications from Webpack, Vite, Rollup, and other build tools are fully captured as their final production bundles. For security professionals, this tool is essential for pentesting and vulnerability assessment. See exactly what code runs on the client, identify potential XSS vectors, understand authentication flows, and analyze API interactions. For developers, study how leading companies structure their front-end code, learn from real-world implementations, and debug issues by comparing with working examples. Remember: extracting is for learning and security research - respect copyrights and don't reuse proprietary code.

Pro Tips

1Use a JavaScript beautifier to make minified code readable
2Look for sourceMappingURL comments at the end of files for source maps
3Search for API endpoints in the code to understand data flow
4Check for hardcoded API keys or sensitive data (and report them responsibly)
5Modern sites often split code into chunks - extract all to see the full picture
6Inline scripts in HTML often contain initial state and configuration data

How It Works

1

Upload

Paste the URL of the page you want to extract from

2

Extract

Our engine processes the file and extracts all embedded assets

3

Download

Get your assets as a ZIP file or browse them individually

Use Cases

Analyze how production web applications are built and structured
Audit third-party scripts on your own site for security and performance
Learn from open-source implementations on live websites
Debug JavaScript issues by comparing with working examples
Security analysis and vulnerability assessment for pentesting
Understand client-side data handling and API interactions
Research framework usage patterns and best practices
Document JavaScript dependencies for compliance and auditing

Frequently Asked Questions

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Ready to Extract?

No signup required. Your files are deleted after 1 hour.