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    bypass-macos-file-dialog

    by Fredrik Akerstrom

    Bypass OS-native file upload dialogs in browser automation using JavaScript interception and DataTransfer injection.

    Updated May 2026
    116 views
    Security scanned

    $5

    One-time purchase

    Included in download

    • Inject files into Puppeteer/Playwright scripts when .setInputFiles() fails
    • Programmatically upload large CSV/JSON datasets to web dashboards
    • browser, file_read automation included
    • Ready for Windows
    • Instant install

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    About This Skill

    What it does

    This skill provides a battle-tested programmatic workaround for one of the most persistent hurdles in browser automation: the OS-native file upload dialog. Whether you are using Playwright, Puppeteer, Selenium, or Claude's computer-use, clicking a file upload button typically triggers a macOS, Windows, or Linux file picker that freezes automation and requires manual intervention.

    This developer-centric tool uses a JavaScript interception technique to bypass the native UI entirely. It overrides the HTMLInputElement.prototype.click method to inject file data directly into the browser's DOM using the DataTransfer API, triggering a synthetic change event that web frameworks recognize as a valid user upload.

    Why use this skill

    • Zero Manual Intervention: Fully automates file uploads without getting stuck on system-level popups.
    • Framework Agnostic: Works seamlessly with React, Angular, Vue, Polymer (YouTube Studio), and jQuery.
    • Cross-Platform: Bypasses dialogs on macOS Finder, Windows Explorer, and Linux file managers.
    • Invisible to Apps: Sophisticated injection makes the programmatic upload indistinguishable from a real user action.
    • Reliable Content Staging: Includes specific patterns for handling large text files, binary data via Base64, and multi-file uploads.

    Supported Workflows

    The skill is designed for developers building automated scrapers, content uploaders, or RPA bots. It is particularly effective for complex sites like YouTube Studio or enterprise internal tools where input.value assignment is blocked by security headers.

    📖 Learn more: Best Frontend & Design Skills for Claude Code →

    Use Cases

    • Automate YouTube subtitle uploads without manual Finder interaction
    • Inject files into Puppeteer/Playwright scripts when .setInputFiles() fails
    • Programmatically upload large CSV/JSON datasets to web dashboards
    • Bypass security-restricted file inputs in React and Angular applications
    • Upload files (text base not PDF or MP4 etc) to websites without getting blocked when MacOS file upload window appears.

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    Security Scanned

    Passed automated security review

    Permissions

    Browser
    Read Files

    Note: This skill requires broad Read access (**/*) because it is designed to prepare and inject any file type (text based) from any location the user specifies into the browser DOM. The script only reads target files and does not modify, delete, or overwrite any local files.

    Tags

    automation
    browser-automation
    javascript
    macos-bypass
    playwright
    file upload bypass
    native dialog bypass
    Puppeteer
    Playwright
    Selenium
    RPA
    JavaScript interceptor
    DataTransfer API
    HTMLInputElement bypass
    programmatic file upload
    Python
    JavaScript
    Claude computer-use
    headless browser testing

    Supported Operating Systems: Fully compatible with macOS, Windows, and Linux environments. Supported Web Browsers: Works seamlessly across all major modern browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, and Apple Safari. Automation Frameworks: Designed to work with standard browser automation and RPA tools, including Puppeteer, Playwright, Selenium, and Claude computer-use. Technical Requirements: Python Payload Preparer (prepare_injection.py): Requires Python 3 to run. It utilizes only built-in standard libraries (such as json, os, and argparse), meaning no external dependencies or pip install commands are required. JavaScript Interceptor (interceptor.js): Written in pure Vanilla JavaScript using standard web APIs (DataTransfer, File, Object.defineProperty). It is entirely framework-agnostic and has been battle-tested on complex single-page applications, including YouTube Studio's Polymer-based interface. Important Implementation Note: For the bypass to function correctly, the JavaScript interceptor script must be injected and executed within the browser's DOM before your automation tool triggers the click event on the target file upload button.

    Creator

    F
    Fredrik Akerstrom

    Claude Skills

    Freelancer, internet entrepreneur and music producer from Sweden.

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