Generate custom CORS headers in seconds to fix cross-origin errors safely.
CORS Policy Generator is a helpful online tool that creates secure CORS headers for websites, APIs, and applications. CORS stands for Cross-Origin Resource Sharing, and it is used to control access between different domains. Many developers face a common error: "No Access-Control-Allow-Origin header is present." This tool solves that issue within seconds. Instead of writing headers manually, users can simply choose their required settings and copy the generated code.
When a website or API needs to access data from another domain, the browser checks for proper permissions. Without a correct policy, the browser blocks the request for security reasons. This protection prevents unauthorized data access and misuse. CORS is important for platforms such as:
A complete CORS policy includes the following headers:
| Header Name | Description |
|---|---|
| Access-Control-Allow-Origin | Specifies which domains are allowed to request data. |
| Access-Control-Allow-Methods | Defines allowed HTTP methods like GET, POST, PUT, DELETE. |
| Access-Control-Allow-Headers | Specifies headers the server allows. |
| Access-Control-Allow-Credentials | Controls cookie/sensitive data sharing. |
Using the tool is simple:
const express = require('express');
const cors = require('cors');
const app = express();
app.use(cors({
origin: 'https://example.com',
methods: 'GET,POST',
}));
app.listen(3000);
header("Access-Control-Allow-Origin: https://example.com");
header("Access-Control-Allow-Methods: GET, POST");
return [
'paths' => ['api/*'],
'allowed_origins' => ['*'],
'allowed_methods' => ['*'],
];
| Error | Solution |
|---|---|
| No Access-Control-Allow-Origin | Add the header in your server config |
| Preflight request fails | Enable OPTIONS method |
| Blocked by CORS policy | Check origin and allowed methods |
The CORS Policy Generator is an essential tool for every web developer. It removes technical errors, improves security, and speeds up web development. Whether you are working on an API, web app, or backend system, this tool helps you generate accurate and safe CORS headers in seconds. It is free to use and suitable for all programming languages and frameworks. Start using it today to avoid CORS errors and build secure web applications.