---
title: 'API Gateway 101'
description: 'Learn the fundamentals of API Gateways: functions, benefits, and more.'
image: 'https://assets.bytebytego.com/diagrams/0074-api-gateway-101.png'
createdAt: '2024-02-15'
draft: false
categories:
  - api-web-development
tags:
  - API Gateway
  - Microservices
---

![](https://assets.bytebytego.com/diagrams/0074-api-gateway-101.png)

An API gateway is a server that acts as an API front-end, receiving API requests, enforcing throttling and security policies, passing requests to the back-end service, and then returning the appropriate result to the client.

It is essentially a middleman between the client and the server, managing and optimizing API traffic.

**Key Functions of an API Gateway**

*   **Request Routing:** Directs incoming API requests to the appropriate backend service.
*   **Load Balancing:** Distributes requests across multiple servers to ensure no single server is overwhelmed.
*   **Security:** Implements security measures like authentication, authorization, and data encryption.
*   **Rate Limiting and Throttling:** Controls the number of requests a client can make within a certain period.
*   **API Composition:** Combines multiple backend API requests into a single frontend request to optimize performance.
*   **Caching:** Stores responses temporarily to reduce the need for repeated processing.