How do I install the Cors Gen skill?

Run npx skillmds@latest add demerzels-lab/cors-gen in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Cors Gen skill do?

Generate CORS configuration for your stack. Use when cross-origin requests are blocked. It is listed under Coding & Dev Tools on SkillMD.

Is Cors Gen safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Cors Gen?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Cors Gen free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Cors Gen?

Demerzels-lab (@demerzels-lab) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Cors Gen by demerzels-lab — Agent Skill

Name: Cors Gen
Author: Demerzels-lab

File contents

CORS Generator

CORS errors are the bane of frontend development. Describe your setup and get the exact configuration you need for your stack.

One command. Zero config. Just works.

Quick Start

npx ai-cors "frontend on localhost:3000, API on localhost:8080"

What It Does

Generates CORS config for your specific server/framework
Handles complex setups with multiple origins
Includes credentials, headers, and method configuration
Works with Express, Fastify, Next.js, and more

Usage Examples

# Local development
npx ai-cors "frontend on localhost:3000, API on localhost:8080"

# Production setup
npx ai-cors "React app on vercel, Express API on Railway"

# Multiple origins
npx ai-cors "allow requests from app.example.com and admin.example.com"

# With credentials
npx ai-cors "frontend on vercel, API on heroku, needs cookies"

Best Practices

Be specific about origins - don't use * in production
Allow only needed methods - GET, POST, not everything
Consider credentials - cookies require specific config
Test in incognito - browser caching can hide issues

When to Use This

"CORS blocked" errors in the console
Setting up a new API endpoint
Migrating frontend or backend to new domain
Adding authentication to an existing API

Part of the LXGIC Dev Toolkit

This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.

Find more:

GitHub: https://github.com/LXGIC-Studios
Twitter: https://x.com/lxgicstudios
Substack: https://lxgicstudios.substack.com
Website: https://lxgicstudios.com

Requirements

No install needed. Just run with npx. Node.js 18+ recommended. Needs OPENAI_API_KEY environment variable.

npx ai-cors --help

How It Works

Takes your plain English description of your frontend and backend setup, then generates the correct CORS configuration for your server framework. The AI handles the nuances of preflight requests, allowed headers, and credential handling.

License

MIT. Free forever. Use it however you want.

---name: cors-gendescription: Generate CORS configuration for your stack. Use when cross-origin requests are blocked.---# CORS GeneratorCORS errors are the bane of frontend development. Describe your setup and get the exact configuration you need for your stack.**One command. Zero config. Just works.**## Quick Start```bashnpx ai-cors "frontend on localhost:3000, API on localhost:8080"```## What It Does- Generates CORS config for your specific server/framework- Handles complex setups with multiple origins- Includes credentials, headers, and method configuration- Works with Express, Fastify, Next.js, and more## Usage Examples```bash# Local developmentnpx ai-cors "frontend on localhost:3000, API on localhost:8080"# Production setupnpx ai-cors "React app on vercel, Express API on Railway"# Multiple originsnpx ai-cors "allow requests from app.example.com and admin.example.com"# With credentialsnpx ai-cors "frontend on vercel, API on heroku, needs cookies"```## Best Practices- **Be specific about origins** - don't use * in production- **Allow only needed methods** - GET, POST, not everything- **Consider credentials** - cookies require specific config- **Test in incognito** - browser caching can hide issues## When to Use This- "CORS blocked" errors in the console- Setting up a new API endpoint- Migrating frontend or backend to new domain- Adding authentication to an existing API## Part of the LXGIC Dev ToolkitThis is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.**Find more:**- GitHub: https://github.com/LXGIC-Studios- Twitter: https://x.com/lxgicstudios- Substack: https://lxgicstudios.substack.com- Website: https://lxgicstudios.com## RequirementsNo install needed. Just run with npx. Node.js 18+ recommended. Needs OPENAI_API_KEY environment variable.```bashnpx ai-cors --help```## How It WorksTakes your plain English description of your frontend and backend setup, then generates the correct CORS configuration for your server framework. The AI handles the nuances of preflight requests, allowed headers, and credential handling.## LicenseMIT. Free forever. Use it however you want.

Frequently asked questions

Cors Gen