CORS Config Generator Pro
PROGenerate secure CORS configurations for your backend server.
🔒
Pro Tool — Free mode limited
Unlock all server configurations and Pro features
Common Scenarios
Allowed Origins
One origin per line. Use * for public APIs (not recommended for production).
Allowed Methods
Allowed Headers
One header per line. Common: Content-Type, Authorization, X-Requested-With
Exposed Headers
Headers exposed to the browser. Leave empty for default.
Advanced Options
Include cookies in cross-origin requests
Cache preflight request results
Continue after preflight for OPTIONS
Select Server Type
Generated Configuration
Express.js// Generated CORS config will appear here...
Response Headers Preview
Access-Control-Allow-Origin:
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Access-Control-Allow-Methods:
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Access-Control-Allow-Headers:
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Access-Control-Allow-Credentials:
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Access-Control-Max-Age:
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Security Tips
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✓
Never use
*with credentials - browsers will block it - ✓ Specify exact origins in production for better security
- ✓ Use appropriate Max-Age to reduce preflight requests
- ⚠ OPTIONS preflight is sent before non-simple requests