What is an API gateway? API simplicity and stability

API gateways are a response to a key outcome of the microservices architecture style: the proliferation of services and their interfaces. The core purpose of an API gateway is to simplify and stabilize the interfaces exposed to clients.

In addition to this, because of the unique position of an API gateway in the architecture, a variety of add-on benefits are enabled, like monitoring, logging, security, load balancing, and manipulation of traffic.

[ Also on InfoWorld: The decline of Heroku ]

An API gateway is similar to the Facade design pattern, but applied at the network level. The objective in both cases is to provide a simplified interface profile that hides the complexity of the system. You can see this idea in Figure 1.

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