May 18, 2024

WordPress is one of the world’s most popular content management systems (CMSs), helping small and large businesses set up and create various forms of website content. But WordPress has evolved past just supporting traditional blog content — and that’s largely thanks to the WordPress REST API.

The WordPress REST API connects WordPress and other external web applications. It facilitates more accessible communication and helps you build immersive, engaging web experiences that integrate seamlessly with the CMS platform.

This API uses endpoints to retrieve and manipulate WordPress content as JSON objects. With these endpoints, you can create, read, update, and delete (CRUD) WordPress content remotely without logging into the WordPress Admin account, bringing flexibility and extending WordPress’s functionality beyond its core features.

This guide explores what the WordPress REST API is, its benefits, how it extends WordPress’s base capabilities, and how to create, register, and access a custom endpoint.


To follow this tutorial, you need:

Understanding the WordPress REST API

The WordPress REST API is a powerful interface that allows you to interact with WordPress sites programmatically using standard HTTP methods.

Its default capabilities include accessing and manipulating various types of WordPress data, such as posts, pages, comments, users, and taxonomies, in a structured JSON format. You can also remotely perform CRUD actions on content.

However, the WordPress REST API’s true value lies in its extensibility through custom endpoints. You can create custom endpoints to tailor the API to specific needs, such as integrating additional functionalities, third-party services, or unique data structures. This flexibility empowers you to build highly customized and feature-rich applications on top of WordPress.

How to plan your custom API endpoint

Planning the structure and purpose of your custom endpoints is key for efficient API development. Custom endpoints tailored to your specific needs require careful consideration to ensure optimal functionality. Strategic planning facilitates scalability and adaptability, future-proofing endpoints to accommodate evolving business requirements.

Planning your custom API endpoints before implementation supports:

  • Clarity of endpoint function — Planning your endpoint clarifies the endpoint’s specific function, its expected data types, and usage.
  • Consistency and development efficiency — Planning also ensures consistency in using the endpoints, response types, and formatting, which improves interaction with the API. Furthermore, knowing the API’s purpose enables proper implementation, reducing development time and the risk of errors.
  • Scalability and adaptability — Defining the needs of your endpoint helps future-proof it to accommodate changing business needs and requirements without requiring a complete redesign.
  • Security—Proper endpoint planning helps determine the need for authentication to access or manipulate data. Getting content via the API sometimes involves no user authentication. Still, for content containing sensitive or unauthorized data, it’s essential to define security requirements and implement measures like authorization and access controls to help ensure data security.

The hands-on sections that follow explain how you can create a custom endpoint that is available at site-domain/wp-json/custom/v2/testimonials to retrieve customer testimonials from a WordPress database site.

After sending a request, the endpoint returns a JSON object containing information about the testimonials on your WordPress site as defined in your callback function.

Let’s dive in!

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