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CORS Header Generator

Visual builder for Cross-Origin Resource Sharing (CORS) HTTP headers. Configure origins, methods, headers, credentials, and max-age. Output as HTTP headers, Nginx config, Express.js middleware, or Apache .htaccess. Runs entirely in your browser.

cors http security headers nginx express apache generator

Published May 29, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Visually configure CORS headers by selecting origins, methods, allowed headers, and additional options. The tool generates the corresponding HTTP headers plus server-specific config for Nginx, Express.js, and Apache. Includes validation to catch common misconfigurations.

Features

  • Visual builder: configure all CORS headers through an interactive UI
  • 4 output formats: raw HTTP headers, Nginx config, Express.js middleware, Apache .htaccess
  • 6 presets: Permissive (Dev), Restrictive (Prod), API Server, Static Assets/CDN, Same-Origin Only, Microservices
  • Origins management: add/remove specific origins or use wildcard
  • Method selection: toggle individual HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
  • Header management: add custom allowed headers with quick-add suggestions
  • Expose headers: configure headers accessible to JavaScript
  • Credentials & Private Network: toggle Access-Control-Allow-Credentials and Private Network
  • Max-Age control: set preflight cache duration
  • Validation: warns about wildcard+credentials, missing OPTIONS, excessive max-age
  • Import: parse existing CORS headers to populate the builder
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Configuring CORS for REST APIs or GraphQL endpoints
  • Generating Nginx or Apache config snippets for CORS
  • Debugging CORS issues by building the correct header set
  • Setting up development vs production CORS policies