Nginx vs Caddy: Which Should You Use?

Nginx vs Caddy is the reverse-proxy decision that stalls more deployments than any other config file. You pick Nginx for battle-tested performance and Caddy for zero-config HTTPS, but the real choice comes down to who maintains your infrastructure.

Here's what I've found running both in production: Nginx is a mature, modular workhorse that rewards deep configuration knowledge, while Caddy is a modern tool that prioritizes developer experience and automation. This Nginx vs Caddy comparison breaks down the practical differences so you can pick without second-guessing.

Nginx vs Caddy: The Key Differences

The core difference is philosophy. Nginx is a Swiss Army knife with a config file that gives you complete control over every request. Caddy is a focused tool that automates the boring parts — especially TLS certificates — and gets out of your way.

Configuration syntax is where you feel this immediately. Nginx uses a declarative block structure that's powerful but verbose:

server {
    listen 443 ssl;
    server_name api.example.com;

    ssl_certificate /etc/letsencrypt/live/api.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.example.com/privkey.pem;

    location /api/ {
        proxy_pass http://backend:3000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

Caddy does the same with five lines and automatic HTTPS:

api.example.com {
    reverse_proxy /api/* backend:3000
}

That's not a gimmick. Caddy's automatic TLS is genuinely useful — it provisions, renews, and rotates certificates without any manual steps. Nginx requires a separate certbot cron job or a third-party module.

Performance is closer than most people think. Nginx edges out Caddy on raw static file serving and high-concurrency workloads, but the gap narrows significantly with modern hardware. If you're serving millions of requests per second, Nginx wins. If you're serving typical web traffic, you won't notice the difference.

Extensibility is Nginx's strong suit. Its module ecosystem — Lua scripting, dynamic upstreams, caching plugins — has no Caddy equivalent. Caddy has plugins too, but they're less mature and less documented.

When to Use Nginx

Choose Nginx when you need fine-grained control or you're building infrastructure that demands battle-tested reliability.

Specific scenarios:

• High-traffic static file servers — Nginx's event-driven architecture handles concurrent connections more efficiently
• Complex routing rules — regex-based location blocks, URL rewriting, and conditional logic are first-class citizens
• Legacy integrations — many CDNs, load balancers, and monitoring tools have Nginx-specific plugins
• Team familiarity — if your team already knows Nginx, the learning curve for advanced features is zero

Nginx also shines as a caching layer. Here's a practical example that's hard to replicate in Caddy:

location /api/ {
    proxy_cache my_cache;
    proxy_cache_key "$host$request_uri";
    proxy_cache_valid 200 60m;
    proxy_pass http://backend:3000;
}

When to Use Caddy

Choose Caddy when developer velocity matters more than raw performance, or when you're tired of TLS certificate management.

Specific scenarios:

• Personal projects and side projects — you want deployment to be boring and instant
• Containerized environments — Caddy's Docker integration is cleaner, with automatic service discovery
• Teams without dedicated DevOps — automatic HTTPS means one less thing to break
• Rapid prototyping — the config file is so small that changing routes takes seconds, not minutes

Caddy's on_demand TLS is a killer feature for ephemeral environments. You can spin up a subdomain-based multi-tenant service without managing certificates per tenant:

*.apps.example.com {
    tls {
        on_demand
    }
    reverse_proxy {SERVICE_HOST}
}

Nginx or Caddy: Which One Should You Pick?

If you're building production infrastructure that must never go down, choose Nginx. Its performance characteristics, debugging tools, and operational maturity are unmatched.

If you're shipping features and don't want to think about TLS, choose Caddy. The time savings from automatic certificates alone justify the switch for most projects.

If you're a solo developer or small team, the answer is almost always Caddy. The learning curve is smaller, the config is shorter, and the HTTPS automation eliminates an entire class of errors.

If you're at a company with existing Nginx expertise, stay with Nginx. The migration cost won't outweigh the convenience gains unless you're drowning in certificate management.

My Take

I run both in production right now. Nginx powers my high-traffic API gateway because I need its rate limiting and caching modules. Caddy handles every new side project I build because I'm done wrestling with certbot.

Here's the honest truth: most developers overestimate their need for Nginx's advanced features. If you're not pushing millions of requests per day, Caddy's automatic HTTPS and simpler config will save you hours every month. For everything else, Nginx's ecosystem and raw performance make it the safer bet.

The one thing that makes this decision obvious: if you've ever spent more than an hour debugging a TLS certificate renewal, you need Caddy. If you've never thought about TLS renewal, Nginx is fine.