API Gateway vs Reverse Proxy: What’s the Difference?

When building modern web applications, you’ll often hear terms like API gateway, reverse proxy, load balancer, and edge gateway. They all sit between clients and backend servers, so it can be difficult to understand what actually makes them different.

The confusion is understandable. A reverse proxy can route requests, hide your backend servers, terminate TLS, and even cache responses. An API gateway can do many of those same things-but usually adds API-specific capabilities such as authentication, rate limiting, request policies, analytics, and security controls.

So, what’s the difference? The short answer is: A reverse proxy primarily acts as an intermediary between clients and backend servers, while an API gateway is a more specialized layer designed to manage, secure, monitor, and control API traffic.

In this guide, we’ll compare API gateways and reverse proxies, explain how they work, look at their key differences, and help you decide which one makes sense for your architecture.

What Is a Reverse Proxy?

A reverse proxy is a server that sits in front of one or more backend servers and receives requests on their behalf.

Instead of a client connecting directly to your application server:

Client
↓
Application Server

The client connects to the reverse proxy:

Client
↓
Reverse Proxy
↓
Application Server

The reverse proxy receives the request, determines where it should go, forwards it to the appropriate backend, receives the response, and sends that response back to the client.

Popular reverse proxy technologies include NGINX, HAProxy, and Envoy.

A reverse proxy can be useful for:

• Load balancing
• TLS termination
• Request routing
• Caching
• Compression
• Hiding backend infrastructure
• Connection management
• Basic access control

For example, suppose you have three application servers:

┌─── API Server 1
Client → Reverse Proxy ─── API Server 2
└─── API Server 3

The reverse proxy can distribute incoming traffic across those servers.

What Is an API Gateway?

An API gateway is a specialized gateway designed to manage API traffic between clients and backend services.

A basic API gateway architecture looks like this:

Client
↓
API Gateway
↓
Backend APIs
↓
Database / Services

An API gateway can perform many of the same functions as a reverse proxy but adds API-specific capabilities. These can include:

• API authentication
• Authorization
• API key management
• Rate limiting
• Quotas
• WAF protection
• DDoS protection
• Request validation
• API versioning
• API transformation
• API analytics
• API logging
• Caching
• Circuit breakers
• Traffic routing

This makes an API gateway particularly useful when your application exposes multiple APIs or microservices.

API Gateway vs Reverse Proxy: The Core Difference

The easiest way to understand the difference is to think about scope and purpose.

A reverse proxy is primarily concerned with:

“Where should this request go?”

An API gateway is concerned with:

“Should this API request be allowed, how should it be handled, where should it go, and what should happen if something goes wrong?”

Here’s a simplified comparison:

| Feature | Reverse Proxy | API Gateway |
|---|---|---|
| Request forwarding | ✅ | ✅ |
| Load balancing | ✅ | ✅ |
| TLS termination | ✅ | ✅ |
| Hide origin servers | ✅ | ✅ |
| Basic routing | ✅ | ✅ |
| API authentication |