🍋 Privacy & Security
CORS Header Generator
Build Cross-Origin Resource Sharing configurations
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About CORS Header Generator
Generate CORS (Cross-Origin Resource Sharing) configurations for Nginx, Express.js, Apache, and Django. Control which domains can access your API.
How It Works
Takes your CORS parameters (allowed origins, methods, headers) and generates server-specific configuration snippets. Includes preflight OPTIONS handling and credential support.
Step by Step
- 1 Enter allowed origin(s) or use * for any origin
- 2 Select allowed HTTP methods
- 3 Specify allowed request headers
- 4 Configure credentials and max-age
- 5 Click Generate and copy the config for your server
Tips
- Avoid using * with credentials — browsers will reject it
- Set max-age to cache preflight responses (3600 = 1 hour)
- List only the headers your API actually needs
- Expose headers that the client needs to read from responses
Frequently Asked Questions
What is CORS?
CORS is a browser security mechanism that controls which websites can make requests to your server. Without proper CORS headers, cross-origin requests are blocked.
Why do I get CORS errors?
Your server is not sending the correct Access-Control-Allow-Origin header. Use this tool to generate the right configuration for your server type.