Free Online CORS Header Generator & Policy Configurator—
gemini-3.0-flash
gemini-3.0-flashInstantly generate accurate CORS headers for your web server. Configure Access-Control-Allow-Origin, methods, and credentials for Nginx, Apache, Express, and PHP.
AI Generation Prompt
Free Online CORS Header Generator
Overview
A high-performance, single-file browser utility designed to help developers create accurate Cross-Origin Resource Sharing (CORS) configuration snippets. The tool simplifies complex header requirements into clean, copy-pasteable snippets for various web server environments.
Core Features
- Dynamic Configuration Form: Interactive inputs for
Access-Control-Allow-Origin,Access-Control-Allow-Methods,Access-Control-Allow-Headers,Access-Control-Allow-Credentials, andAccess-Control-Max-Age. - Multi-Environment Output: Real-time generation of config code for Nginx, Apache (.htaccess), Express.js (Node), PHP, and Python.
- Live Preview: A live updated output window showing the formatted header directives.
- Copy-to-Clipboard: One-click functionality to copy specific configuration blocks.
- Educational Tooltips: Integrated help icons explaining what each CORS header does, assisting junior developers in understanding security implications.
Technical Implementation Specifications
- Architecture: Single HTML5 file containing internal CSS and Vanilla JavaScript.
- State Management: All application state is stored in memory using JS objects and variables. Constraint: ABSOLUTELY NO
localStorage,sessionStorage, or Cookies. - UI Frameworks: Utilize Tailwind CSS (via CDN) for styling. Implement Inter font (Google Fonts) for a modern SaaS aesthetic.
- Syntax Highlighting: Use a lightweight library like Prism.js (via CDN) to render code blocks with professional syntax coloring.
- Interaction Design:
- Use soft, subtle box-shadows on input cards.
- Smooth transition animations (ease-in-out) when switching between server environments.
- Custom, non-blocking notification toasts for "Copied to Clipboard" success messages (avoiding
alert()usage).
UI/UX Design Directives
- Color Palette: Strictly light-mode design. Use shades of slate (#f8fafc), white (#ffffff), and a primary "action" blue (#2563eb) for buttons and accents. Text should be high-contrast dark gray (#1e293b).
- Responsive Layout:
- Mobile: Single column flow with stacked inputs.
- Desktop: Two-column split. Left side: Input configuration controls. Right side: Output code snippets.
- Component Structure:
- Header: Simple, clean branding with a descriptive H1.
- Main Tool Area: Clearly segmented sections for inputs, toggle switches, and code output.
- Accessibility: Ensure high contrast ratios and keyboard-navigable inputs for accessibility compliance.
Developer Guidelines
- Sandbox Safety: The app must function perfectly in a null-origin iframe.
- Performance: Keep the JavaScript bundle lightweight; avoid heavy dependencies. Vanilla JS preferred for all DOM manipulation.
- Asset Loading: All assets (Tailwind, Prism, Fonts) must be loaded via CDN links in the
<head>section. - Constraint: Strictly NO external trackers, analytics, or cookies.
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Frequently Asked Questions
Everything you need to know about using this application.
What is the purpose of this CORS header generator?
This tool helps developers generate the correct HTTP headers required to safely allow Cross-Origin Resource Sharing (CORS) between different domains, preventing browser security errors.
Does this tool store my server configuration?
No. This application is designed with privacy in mind. It does not use cookies, local storage, or server-side databases. All generation happens locally in your browser's memory.
Which server configurations are supported?
The generator provides ready-to-use snippets for popular environments including Nginx, Apache (.htaccess), Node.js (Express), PHP, and Python (Flask/Django).
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