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cors-cookie-auth

Configure CORS headers for cookie authentication in API route handlers.

2|Updated Feb 13, 2026
Search Tags:#debugging#web development#api#cors#cross-origin#cookie authentication
One-click install
npx skills add https://github.com/pmarashian/cursor-agent-skills --skill cors-cookie-auth
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: cors-cookie-auth
Source: https://github.com/pmarashian/cursor-agent-skills/tree/main/cors-cookie-auth
Command: npx skills add https://github.com/pmarashian/cursor-agent-skills --skill cors-cookie-auth

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps debug and resolve issues with cookie-based authentication when your frontend and backend are on different origins, a common stumbling block in web development.

Core Features & Use Cases

  • Diagnose CORS/Cookie Conflicts: Identifies misconfigurations in Access-Control-Allow-Origin and Access-Control-Allow-Credentials headers.
  • Backend Header Enforcement: Guides you on setting the correct CORS headers directly in API route handlers when middleware is insufficient.
  • Use Case: You're developing a React app on localhost:3001 that needs to authenticate with a Node.js API on localhost:3000 using cookies, but requests are failing due to authentication errors. This Skill helps you pinpoint and fix the CORS configuration.

Quick Start

Use the cors-cookie-auth skill to ensure the backend is sending the correct CORS headers for cookie authentication.

Frequently Asked Questions about cors-cookie-auth

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does cross-origin cookie authentication fail in my web application?▼

Cross-origin cookie authentication fails when backend responses lack specific `Access-Control-Allow-Origin` headers or the `Access-Control-Allow-Credentials` flag, preventing browsers from sending cookies across different origins.

How do I fix CORS header issues when framework middleware does not apply to API routes?▼

To fix CORS header issues when middleware fails, you must configure the `Access-Control-Allow-Origin` and `Access-Control-Allow-Credentials` headers directly within your specific API route handlers to ensure proper cross-origin cookie transmission.

How can I debug cross-origin cookie authentication problems using curl?▼

You can debug cross-origin cookie authentication by using curl to verify the presence and correctness of CORS headers in the API response, ensuring that `Access-Control-Allow-Credentials` is true and the origin matches exactly.

Do I need to set Access-Control-Allow-Origin to a specific value for cookie auth?▼

Yes, for cookie authentication, `Access-Control-Allow-Origin` cannot be a wildcard (`*`). It must explicitly reflect the requesting frontend origin, and `Access-Control-Allow-Credentials` must be set to true for browsers to accept the cookies.

What should I do if my React app cannot authenticate with a Node.js API using cookies?▼

If your React frontend cannot authenticate with a Node.js API using cookies, inspect the CORS configuration on your backend routes to ensure proper credential headers are set directly in the route handlers if middleware is bypassed.

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