CORS Anywhere Alternative

What is CORS Anywhere?

CORS Anywhere is an open-source Node.js reverse proxy created by Rob Wu that adds CORS headers to proxied requests. It became the go-to solution for developers encountering CORS errors during development, with its public demo instance at cors-anywhere.herokuapp.com seeing massive adoption.

However, in January 2021, the public demo was downgraded to “demo-only” status with strict rate limits after abuse and overwhelming traffic. Users must now visit the demo page and request temporary access, making it unsuitable for production use.

CORS Anywhere vs CorsProxy.io

The demise of the public CORS Anywhere instance highlights why managed solutions like CorsProxy.io are essential:

Availability: CORS Anywhere’s public demo is rate-limited and requires manual opt-in every few hours. CorsProxy.io provides 99.99% uptime with a proper free tier of 10,000 requests/month.

Performance: Self-hosted CORS Anywhere runs on single servers with no edge caching. CorsProxy.io uses a global CDN with 300+ edge locations for sub-50ms response times.

Maintenance: CORS Anywhere requires you to manage servers, handle scaling, and maintain security patches. CorsProxy.io is fully managed with no DevOps overhead.

// CORS Anywhere (if you can get access)
const response = await fetch(
  `https://cors-anywhere.herokuapp.com/${targetUrl}`
);

// CorsProxy.io (always available)
const response = await fetch(
  `https://corsproxy.io/?url=${encodeURIComponent(targetUrl)}`
);

Why Developers Migrated Away

After CORS Anywhere’s public instance restrictions, developers faced three options:

1. Self-host CORS Anywhere - Requires DevOps expertise, ongoing maintenance, and scaling costs
2. Find alternatives - Many free alternatives are unreliable or have disappeared
3. Use managed services - CorsProxy.io provides reliability without complexity

Self-Hosting vs Managed Service

Migration from CORS Anywhere

Switching from CORS Anywhere to CorsProxy.io is straightforward:

// Before (CORS Anywhere)
const corsProxy = 'https://cors-anywhere.herokuapp.com/';
const response = await fetch(corsProxy + targetUrl);

// After (CorsProxy.io)
const corsProxy = 'https://corsproxy.io/?url=';
const response = await fetch(corsProxy + encodeURIComponent(targetUrl));

The main difference is URL encoding—CorsProxy.io expects properly encoded target URLs for security and reliability.