Beyond REST: Exploring the Full API Toolbox for Modern Development

Many people equate APIs with REST, and even large companies and banks often limit themselves to considering only REST APIs.

In reality, while REST has been a dominant design pattern for the past decade, it is just one way to use the web for APIs.

Modern API toolkits encompass a variety of standards and methods, such as REST, real‑time streaming, gRPC, event‑driven architectures, and more.

API – Application Programming Interface

An API defines how different software systems interact, specifying the protocols and conventions they follow.

For example, Java provides database APIs that define how to connect to and query databases like Oracle, MySQL, or PostgreSQL, but the actual communication relies on the database’s own protocols.

Developers supply the database details, and the Java API abstracts the underlying communication.

APIs can be fully customized while adhering to industry standards to ensure interoperability.

What is the purpose of an API?

APIs abstract underlying complexity, offering developers or consumers the necessary objects or operations, thus simplifying programming. A Java developer, for instance, does not need to know how Oracle implements its database; they only use Java’s classes and methods to access data.

API Toolbox and Other APIs

APIs have evolved rapidly in recent years and will continue to do so.

The accompanying diagram shows that many widely used APIs are not limited to RESTful HTTP; some use TCP/IP, STOMP, or other protocols.

Every programming language provides APIs for communicating with other systems in a similar manner. This article focuses on the fact that APIs are not limited to REST.

REST (Representational State Transfer) is an architectural style with specific constraints; an API that follows these constraints is a RESTful API.

Conclusion

It is clear that APIs are not synonymous with REST. When developing, carefully select the API style that best fits your organization rather than defaulting to a single RESTful approach.