cors-gen

What This Skill Does

The cors-gen skill simplifies the complex and often frustrating process of configuring Cross-Origin Resource Sharing (CORS) policies. By acting as an intelligent bridge between your plain-English infrastructure description and your codebase, this tool automatically generates secure, framework-specific CORS configurations. It eliminates manual header management, reduces the likelihood of permissive "star" configurations that create security vulnerabilities, and handles the intricate logic required for credential-based requests, custom HTTP methods, and preflight optimization.

Installation

To integrate this skill into your environment, run the following command within your terminal or OpenClaw interface:

clawhub install openclaw/skills/skills/lxgicstudios/cors-config-gen

Ensure you have Node.js 18 or higher installed on your system. Because this tool utilizes AI to parse your setup, you must provide a valid OPENAI_API_KEY in your environment variables to allow the generator to construct your configuration logic.

Use Cases

• Development Workflow: Quickly resolving "CORS blocked" errors when the frontend development server on localhost communicates with a local backend API.
• Production Deployment: Generating production-ready middleware that restricts access to specific, allowed origins rather than generic wildcards.
• Authentication Scenarios: Configuring necessary headers for applications that require cookies or Authorization headers during cross-domain requests.
• API Migration: Updating CORS policies when moving your application to a new domain, CDN, or cloud infrastructure provider.

Example Prompts

1. "Generate an Express.js CORS configuration for a frontend running on https://myapp.com that allows GET and POST requests and requires credential support."
2. "I am building a Next.js app with an API route that needs to accept requests from both admin.production.com and client.production.com. Create a safe middleware setup."
3. "My Fastify backend is blocking requests from my Vue.js local development environment at port 3000. Create a CORS configuration for local testing."

Tips & Limitations

To get the best results, always be as specific as possible regarding your frontend origins; avoid using wildcards (*) in production code as it undermines your security posture. Remember that this tool handles the configuration logic, but you are responsible for testing the output in a clean browser environment, such as an Incognito window, to ensure cache issues do not interfere with your verification process. Note that this skill requires an active internet connection to communicate with the LLM backend for processing your requirements.