June 2, 2023

REST API: Introduction

REST API is an architectural style that defines a set of principles for building web services. It stands for Representational State Transfer and leverages the existing protocols of the web, to enable communication between different systems.
Antonio Šubert


In the world of web development, REST API (Representational State Transfer Application Programming Interface) has become a key player in building efficient and scalable web applications. In this article, we'll explore what REST API is, how it works, and the benefits it offers to developers.

What is REST API?

REST API is an architectural style that defines a set of principles for building web services. It stands for Representational State Transfer and leverages the existing protocols of the web, such as HTTP, to enable communication between different systems. RESTful APIs follow a client-server model, where the client sends requests to the server, and the server responds with the requested data.

How Does REST API Work?

REST API operates based on a few fundamental principles:

1. Stateless Communication: RESTful APIs are stateless, meaning that each request from the client to the server must contain all the necessary information. The server doesn't maintain any session or context about the client. This simplicity and scalability make REST APIs highly suitable for distributed systems.

2. Resource-Based Architecture: REST APIs are built around resources, which are typically represented by URLs (Uniform Resource Locators). Each resource is uniquely identified, and clients interact with these resources by sending HTTP requests to their respective URLs. For example, a social media API may have endpoints like /users, /posts, and /comments.

3. CRUD Operations: REST APIs support CRUD (Create, Read, Update, Delete) operations on resources using HTTP methods. The most commonly used HTTP methods are:

  • GET: Retrieve a resource or a collection of resources.
  • POST: Create a new resource.
  • PUT: Update an existing resource.
  • DELETE: Remove a resource.

By combining these HTTP methods with resource URLs, REST APIs provide a consistent and predictable interface for interacting with data.

4. Representation of Resources: RESTful APIs use various data formats to represent resources, such as JSON (JavaScript Object Notation) or XML (eXtensible Markup Language). JSON has emerged as the de facto standard due to its simplicity and compatibility with modern web technologies.

Benefits of REST API for Developers

REST API offers several advantages for developers:

1. Scalability and Separation of Concerns: RESTful APIs provide a scalable architecture by separating the client and server concerns. Developers can design APIs that can handle a large number of concurrent requests, as each request is independent and stateless.

2. Compatibility and Interoperability: RESTful APIs are built on widely adopted web standards like HTTP, which makes them compatible with various platforms and technologies. This interoperability allows different systems to communicate seamlessly, regardless of their underlying technologies.

3. Modularity and Maintainability: By designing APIs around resources, developers can create modular and maintainable codebases. Each resource can have its own set of endpoints and associated logic, promoting code organization and reusability.

4. Security: REST API provides a flexible and secure way of authentication and authorization. With the use of standard security mechanisms like OAuth, developers can ensure that only authorized clients can access protected resources.

5. Improved Frontend Development: RESTful APIs act as a bridge between the backend and frontend, enabling frontend developers to access data and build dynamic user interfaces. This separation of concerns allows frontend developers to focus on UI/UX without worrying about the intricacies of data retrieval and manipulation.


REST API has become a cornerstone of modern web development, offering a scalable and efficient approach to building web applications. By adhering to the principles of REST, developers can create APIs that are compatible, modular, and secure. RESTful APIs facilitate seamless communication between systems and empower frontend developers to create dynamic and interactive user interfaces. Embracing REST API as a key component of your development toolkit will enable you to build robust and high-performing web applications that can scale with your user base.

Lipik | Croatia | 2023
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