Generate Production-Ready CORS Headers
Build Access-Control-* CORS headers configured for Nginx, Apache, Express, and Next.js.
About This Tool
CORS Header Generator helps web developers construct correct Cross-Origin Resource Sharing headers, eliminating 'CORS error' browser blocks across multiple server architectures.
Key Features
Support for Nginx, Apache .htaccess, Express.js, and Next.js configs
Configurable methods, allowed headers, and preflight max-age
Credentials toggle with validation safeguards
How to Use This Tool
- Specify your allowed origin (e.g. https://example.com or *).
- Select allowed HTTP methods (GET, POST, PUT, DELETE, OPTIONS).
- Choose your target server: Raw HTTP, Nginx, Apache, Express.js, or Next.js.
- Copy the generated configuration directly into your server config.
Why Use This Tool
- Avoid common CORS misconfigurations that break frontend API calls or expose sensitive credentials.
- Generates syntax for 5 popular backend platforms.
Pro Tips
- Set Access-Control-Max-Age to 86400 (24h) to minimize repeated OPTIONS preflight requests
Frequently Asked Questions
Can I use wildcard (*) with Access-Control-Allow-Credentials: true?
No. Browsers reject CORS responses where Access-Control-Allow-Origin is wildcard (*) if Access-Control-Allow-Credentials is set to true. You must specify the exact origin.
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