CORS Config Generator: Apache, Nginx, Express and Headers
Generate explicit origin allowlists, methods, headers and credential settings for four output formats while rejecting unsafe configuration input.
Enabling local controls…
Generator settings
No requests sent. Up to 30 origins and 50 names per header list (letters/digits/hyphens); Max-Age 0–86400 seconds. Raw headers show separate responses, never a multi-origin Allow-Origin value. Verify server modules, config placement and preflight responses. CORS is not authentication or CSRF protection.
Inputs stay in page memory without transmission, storage or URL insertion.
Static source date: 2026-10-17
Preview and complete output
Set fields or load a sample, then generate.
How to use this tool
Enter origins and headers separated by commas, select methods and output, then generate. Test the configuration and OPTIONS handling in your own environment.
When not to use it
No requests are sent. CORS is not authentication or CSRF protection; wildcard origins cannot use credentials. Raw headers show one response per allowed origin.
Read the guide →