What does Cloudflare provide for free?
DNS management, CDN (caches static assets globally), DDoS protection, free SSL certificate, firewall (block by IP/country), analytics, Page Rules (redirect, cache, secure URLs), and Brotli compression. The free plan is sufficient for most Node.js projects.
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More FAQs in Using Cloudflare for DNS and CDN Free Performance and Security for Node.js
Create a Cloudflare account, add your domain, Cloudflare scans existing DNS records and gives you nameservers, update nameservers at your registrar, configure DNS records in Cloudflare (proxied for CDN features), and set SSL to Full (strict) if you have Let's Encrypt on your origin.
Proxied (orange cloud) routes traffic through Cloudflare, providing CDN caching, DDoS protection, SSL, and firewall. DNS only (gray cloud) just resolves the DNS, and traffic goes directly to your server without Cloudflare features.
Add set_real_ip_from directives in nginx.conf for all Cloudflare IP ranges, then set real_ip_header CF-Connecting-IP. Now $remote_addr and req.ip (with trust proxy) will return the real client IP instead of Cloudflare's IP.
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