Can you compare API Gateway with service mesh in a microservices environment?

spect API Gateway Service Mesh

Purpose Acts as a reverse proxy for

incoming client requests, routing

them to the appropriate service.

Handles internal

service-to-service

communication, including load

balancing, security, and

observability.

Scope Focuses on client-side requests

nd external communication.

Focuses on internal communication

between microservices.

Main

Responsibilitie

Routing, authentication,

rate-limiting, caching, logging.

Service discovery, traffic

management, observability, fault

tolerance.

Common Tools NGINX, Kong, API Gateway in

WS, Spring Cloud Gateway.

Istio, Linkerd, Consul, Kuma.

Integration 	Sits at the edge of the

rchitecture, acting as a

gateway between clients and

services.

Sits within the service mesh and

handles internal communications

between microservices.

Security Provides centralized

uthentication and

uthorization (OAuth, JWT).

Handles service-to-service

security using mutual TLS (mTLS)

for encrypted communication.

Use Cases External API access control,

cross-cutting concerns (e.g.,

rate limiting).

Service-to-service secure

communication, traffic control,

service discovery.

Microservices in Cloud and DevOps