What does an API gateway do?

An API gateway acts as a single entry point for clients to access backend services. It handles authentication, request routing, rate limiting, response transformation, and logging. Instead of clients calling multiple services directly, they send requests to the gateway, which manages the distribution and applies consistent policies across all API traffic.

Why would a company use an API gateway?

Companies use API gateways to simplify architecture, improve security by centralizing authentication, manage traffic with rate limiting, monitor API usage, and decouple clients from backend service details. This allows teams to manage and scale services independently without changing client code.

Is API gateway the same as a load balancer?

No. While a load balancer distributes traffic across multiple servers, an API gateway is more specialized. It manages API-specific concerns like authentication, rate limiting, request transformation, and API versioning. An API gateway may include load balancing, but it has broader responsibilities focused on API management.

How do you use API gateway in a sentence at work?

Example sentences: We deployed a new API gateway to handle authentication. The API gateway configuration needs an update. All requests flow through the API gateway before reaching the backend services.

Is API gateway formal or informal?

API gateway is neutral and professional, used in both formal documentation and casual team conversations in tech companies. It is not slang or overly formal.

API gateway meaning in tech — Speak Tech English

Commonness	4/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓The API gateway routes requests to the appropriate backend service

✓We implemented rate limiting at the API gateway level

✓All external traffic flows through the API gateway

Real examples

in a standup

"We need to update the API gateway configuration to add the new authentication endpoint."

in a code review

"This logic should be moved to the API gateway instead of duplicating it in every service."

in a team meeting

"The API gateway is currently handling 50,000 requests per second without any latency issues."

Don't say this

Handle with care. Often confused with load balancer or reverse proxy; an API gateway is specifically designed to manage API requests and applies business logic like authentication and rate limiting.

✕We use the API gateway to store user data.

✓We use the API gateway to authenticate users and route requests to the backend service that stores user data.— An API gateway manages request flow and policies, not data storage. It is a routing and management layer.

✕The API gateway is the same as a load balancer.

✓The API gateway includes load balancing capabilities, but also handles authentication, rate limiting, and request transformation.— While both manage traffic, an API gateway has broader responsibilities for API-specific management tasks.

✕We need to bypass the API gateway for performance reasons.

✓We optimized the API gateway configuration to reduce latency while maintaining security policies.— Bypassing the gateway compromises security and management. Instead, optimize the gateway itself.

Other forms

noun

API gateway

"The API gateway manages all incoming requests."

noun

API gateways

"We operate multiple API gateways for redundancy."

adjective

API gateway configuration

"The API gateway configuration needs to be updated."

Often used with

deploy an API gatewayUsed when setting up or releasing an API gateway into production

API gateway layerRefers to the architectural layer where the API gateway operates

API gateway routingThe process of directing requests to appropriate backend services

API gateway authenticationSecurity mechanism implemented at the gateway level

API gateway rate limitingControlling request frequency to prevent overload

API gateway latencyDelay introduced by the gateway in request processing

Similar words

API serverLess specific; refers to any server managing APIs, not necessarily a dedicated gateway component

service mesh ingressSimilar concept in Kubernetes environments; focuses on service-to-service communication

reverse proxyMore general term; an API gateway is a specialized type of reverse proxy with API-specific features

Opposites

direct client-to-service communicationmonolithic architecture

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Practice

Try it

4 quick exercises

Complete the sentence

1. Our _______ handles authentication, rate limiting, and request routing for all microservices.

Spot the mistake

2. Which sentence uses API gateway incorrectly?

The API gateway routes requests to the correct backend service.We configured the API gateway to enforce rate limits.The API gateway stores all user credentials securely.The API gateway can transform API responses before sending them to clients.

Pick the most natural phrasing

3. Your team is explaining the architecture. Which sounds most professional?

We have an API gateway that does stuff with requests.Our API gateway manages authentication, routing, and rate limiting across all microservices.The API gateway is like a door for APIs.We use the API gateway to make things work better.

Rewrite naturally

4. Rewrite in tech English: We need to add a middle layer that checks if users are allowed to use the API, sends requests to the right service, and stops too many requests from one user.

Questions

Quick poll

Have you said "api gateway" in a standup this week?

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