CORS Policy Builder

Visually configure CORS (Cross-Origin Resource Sharing) policies and generate ready-to-use configuration snippets for Express.js, NGINX, AWS API Gateway, Apigee, and Kong.

Multi-Platform
Express, NGINX, AWS, Apigee, Kong
Live Preview
Real-time generation
Security Validation
Best practices

Quick Start Templates

Choose a pre-configured scenario or build your own custom CORS policy

CORS Configuration Builder

Configure your CORS policy and generate platform-specific code

http://localhost:3000
Content-TypeAuthorization
const cors = require('cors');

const corsOptions = {
  origin: 'http://localhost:3000',
  methods: ["GET","POST"],
  allowedHeaders: ["Content-Type","Authorization"],
  credentials: true,
  optionsSuccessStatus: 204,
  maxAge: 3600
};

app.use(cors(corsOptions));

CORS Documentation & Best Practices

Comprehensive guide to understanding and implementing secure CORS policies

5
Platform Outputs
Real-time
Security Validation
4
Ready Templates
1-Click
Copy & Export

What is CORS (Cross-Origin Resource Sharing)?

CORS is a security mechanism implemented by web browsers that controls how web pages in one domain can access resources from another domain. It prevents unauthorized cross-origin requests while allowing legitimate ones.

  • Prevents unauthorized cross-domain requests
  • Enables secure API consumption from web apps
  • Uses HTTP headers to communicate policies

Key CORS Headers

  • Access-Control-Allow-Origin - Allowed origins
  • Access-Control-Allow-Methods - Allowed HTTP methods
  • Access-Control-Allow-Headers - Allowed request headers

Important Security Warning

CORS misconfigurations can expose your application to security vulnerabilities. Always validate your CORS policies in a staging environment before deploying to production. Never use wildcard origins (*) with credentials enabled, as this creates serious security risks.

Test policies before production deployment
Monitor for CORS-related security events
Follow principle of least privilege