CORS Config Generator

Visual CORS config generator with server templates and header preview for API debugging, security hardening, and release validation

Build CORS response headers and server snippets with presets for quick API debugging and release checks.

CORS Configuration

Preset Templates

Allowed OriginsAllow all origins *

Avoid wildcard origins with credentials; multi-origin templates match the request origin

Allowed Methods

Allowed Request HeadersAllow all request headers *

Exposed Response Headers

Allow credentials

Preflight cache (seconds)

Generated Config

Server / Framework

Generated Config

add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, PATCH, OPTIONS';
add_header 'Access-Control-Allow-Headers' '*';


add_header 'Access-Control-Max-Age' '86400';

if ($request_method = 'OPTIONS') {
    return 204;
}

HTTP Response Header Preview

Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, PATCH, OPTIONS
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 86400

About CORS

Simple requests use basic methods and headers
Preflight requests validate complex cross-origin operations
Credentials require explicit origins
Production systems should use allowlists

Documentation

What is CORS Config Generator

This tool quickly generates CORS configuration snippets and response-header previews for different server environments.

Key Features

Offer common presets such as open and strict modes.
Customize allowed origins, methods, request headers, and exposed headers.
Configure credentials and max-age behavior.
Generate server-specific code and copy output.

Steps

Choose a preset or customize all options.
Select target server type.
Review generated config and header preview.
Copy and apply to server configuration.

FAQ

Why can't I use `*` with credentials enabled?

Browser rules require explicit origin values when Access-Control-Allow-Credentials is enabled.

How should I handle multiple allowed origins?

Use a server-side whitelist and dynamically return Access-Control-Allow-Origin for matched origins.

CORS Configuration

Generated Config

HTTP Response Header Preview

About CORS

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Documentation

What is CORS Config Generator

Key Features

Steps

FAQ

Why can't I use * with credentials enabled?

How should I handle multiple allowed origins?

Why can't I use `*` with credentials enabled?