How to Access and Manipulate Site Data for Custom Applications: The Power of WordPress Core APIs

WordPress Core

You’ve probably heard of the API if you’re a WordPress website builder. However, if you’re not an experienced developer, you must know what a WordPress API is.

WordPress can be tailored to match any style or requirement conceivable, and millions of wonderfully unique websites have been created with it. WordPress developers may expand the fundamental functionality and transform it into something solid and distinctive using plugins and themes.

Yet regardless of configuration or customization, every WordPress installation has one thing in common: they’re all based on the WordPress core. The foundation of WordPress is the core. It took eleven years to complete and went through multiple major release versions. Regardless of how differently they function or appear, every WordPress site is driven by the same core code.

All of the “foundational” files needed for WordPress to function are collectively called the “core” of WordPress. The  WordPress Core APIs are available as a zip file for download from You may perform the following using core WordPress files: Enter the WordPress administration interface. Post and page addition and editing.

Application Programming Interfaces (APIs): WordPress APIs.

APIs – or Application Programming Interfaces – allow two applications to exchange information. For example, when you visit a website, your browser sends a request to the server where that site is located. The server’s API receives your request, interprets it, and returns all the data needed to display your site.

Of course, the technical workings of APIs are much more complicated, but we’ll focus on what’s more important to you: practical applications. APIs get a lot of attention and visibility because many companies have started using them and making them available as products.

In other words, developers at a company, such as Google, collect some parts of their application code and make them publicly available. In this way, other developers can use the API to help their sites connect to Google and use its features.

Developers may access WordPress from locations other than the WordPress installation itself by using the REST API for WordPress. It may be accessed via JavaScript, allowing interactive web pages and applications.

Application Programming Interface and Representational State Transfer are both abbreviations for computer protocols.

What Does This Mean for WordPress?

When you combine the terms REST and API, you get the idea that the WordPress REST API is a body of code created to enable other systems to communicate with WordPress. It was developed to guarantee that these systems will speak with one another.

It indicates that a third-party website or mobile application, for example, may access your WordPress database and retrieve or insert data into it.

Understanding the REST API for WordPress

The necessity to open up WordPress to a wider audience and changes in how websites and apps are created led to the creation of the WordPress REST API.

The history of the WordPress REST API

The WordPress REST API was formerly available as a plugin until it was part of the core in version 4.7 in December 2016.

It is intended to help various WordPress-based apps run smoothly and to change WordPress from a content management system into an application platform.

Thanks to the REST API, WordPress may be utilized for various applications. While a content management system excels at managing a complex website, single-page web apps may also be powered by an application platform.

Familiarize Yourself With the Core’s Release Cycle

The WordPress Core APIs is maintained by a team of lead developers, core developers, and guest committers, many of whom are employed by Automattic, the parent company of WordPress. Nonetheless, some core developers and guest committers participate voluntarily or because they are connected to a different WordPress-related business.

WordPress is open source, meaning anybody can add code and documentation to the codebase. On the core, commit access is limited, and all new contributions must pass a code review procedure.

Release cycles are divided into the following five phases:

1. Planning and securing team leads.

Developers are given different jobs and take the lead on the execution of particular features after discussions and planning are conducted regarding the features and fixes that need to be implemented.

2. Construction work starts.

Bug fixes and actual feature implementation start now. Developers are responsible for writing actual code and running automated tests, while team/project leads manage the arrangement.

3. Beta testing.

The codebase is available to beta testers and anyone interested in staying on the cutting edge when development work has substantially progressed. The new code has bugs and other inconsistencies that users find and report, and developers address them as necessary. There are currently no new features.

4. Release Potential

After everything has been finalized, final tests are carried out on the codebase to validate its implementation, reliability, and security.

5. Start

The release has been made public and is accessible for download on any WordPress admin interface.

Major point releases are released two or three times a year, and this phase is repeated for each release cycle.

What Do the WordPress Core APIs Files Do?

First, you should only alter any settings in the WordPress Core APIs files if you are completely familiar with them. These building bricks support your WordPress installation, so you want to keep them from being knocked over.

Then, you should back up your website before changing the back end. Although you can do it manually, for the majority of people having a good plugin to do it for you will be preferable. 

Next, you must utilize an FTP client to access your back end (and the contents inside).

How to Access the WordPress REST API

You must use the command line to access your site to use the WP-REST API. This feature of WordPress is known as WP-CLI. None of this is done through your admin interfaces or by entering the website’s code. 

Accessing WP-REST via WP-CLI

The WordPress Command Line Interface is known as WP-CLI. You may access WP migration using your computer’s Command Line Interface (CLI).


You may have to go through authentication after you’ve entered your site. Some endpoints need authentication, while others are open to the public.

You are not login into your site administrator here; instead, the REST API uses a slightly different method. You must install an authentication plugin to authenticate your site using WP-CLI. The Basic Auth plugin works well and is simple for development installs.


In conclusion, the WordPress REST API is a powerful tool that make you to interact with your WordPress site using standard HTTP requests, opening up new possibilities for creating custom applications and integrations. It enables you to retrieve, create, update, and delete content and perform many other operations using the RESTful API.

To start using the WordPress RESTful API, you must ensure it’s enabled on your site and study its documentation to understand what API endpoints are available and how to use them. Numerous libraries and plugins, such as the WP-API client for JavaScript, Postman, and others, make working with the REST API easier.

The options for your WordPress website for e-commerce web design are endless once you understand the WordPress Core APIs files, what they perform, and where to locate them. If you’re feeling very daring, you’ll be able to resolve problems independently and even build a few sophisticated features.

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