CORS Header Builder
Generate correct CORS headers for your API in seconds
Use * for all origins, or comma-separated specific origins.
Allowed Methods
Output Format
Access-Control-Allow-Origin: * Access-Control-Allow-Methods: GET, POST, OPTIONS Access-Control-Allow-Headers: Content-Type, Authorization Access-Control-Max-Age: 86400
Why This Tool
CORS errors are one of the most common frustrations in web development. Getting the right combination of Access-Control-Allow-Origin, Allow-Methods, Allow-Headers, and preflight settings is tedious and error-prone. This tool builds the correct headers for your use case and generates copy-paste ready configuration snippets.
How It Works
Select your allowed origins, methods, and headers using the visual interface. The tool generates the complete set of CORS headers along with implementation snippets for popular frameworks like Express, Nginx, Apache, and Cloudflare Workers. Copy the config directly into your project.