Introduction — Why the WordPress REST API Matters
WordPress is more than a blogging tool — it’s a powerful content management system (CMS) that can power almost any type of website. But did you know it also works as a platform for applications?
That’s possible thanks to the WordPress REST API.
Introduced in WordPress 4.7, the REST API allows developers to interact with WordPress using JSON data. Instead of being limited to themes and plugins, you can now use WordPress as a headless CMS, powering mobile apps, single-page applications (SPAs), and external integrations.
According to W3Techs, WordPress powers 43% of all websites worldwide. With the REST API, its reach goes beyond websites — it becomes a foundation for apps, APIs, and enterprise solutions.
This beginner’s guide will explain the WordPress REST API, how it works, and how to use it step by step, with examples and practical use cases.
What Is the WordPress REST API?
A REST API (Representational State Transfer Application Programming Interface) is a way for applications to communicate with each other using standard HTTP methods like GET, POST, PUT, and DELETE.
The WordPress REST API provides a set of endpoints (URLs) that return JSON-formatted data from your WordPress site.
Example:
- Access all posts:
https://example.com/wp-json/wp/v2/posts
This URL returns a list of posts in JSON format, which can be used in apps, dashboards, or other websites.
Why the REST API Is Important in WordPress
Benefits:
- Headless CMS: Use WordPress as a content backend while building the front end with React, Vue, or Angular.
- Mobile App Integration: Display WordPress posts in iOS or Android apps.
- Third-Party Integrations: Connect WordPress to external systems (CRMs, ERPs, or analytics tools).
- Custom Dashboards: Build custom admin interfaces for clients.
👉 Example: A news website uses the REST API to feed content into a mobile app, ensuring readers get updates instantly.
How the WordPress REST API Works
The REST API works with endpoints and routes.
- Route: A URL mapped to a specific function.
- Endpoint: The point of interaction within the API.
Example of Endpoints:
- Get posts:
/wp-json/wp/v2/posts - Get pages:
/wp-json/wp/v2/pages - Get categories:
/wp-json/wp/v2/categories
Each endpoint returns data in JSON format that can be used in external applications.
WordPress REST API Methods
The API uses standard HTTP request methods:
- GET → Retrieve data (posts, pages, users).
- POST → Create new content.
- PUT/PATCH → Update existing content.
- DELETE → Delete content.
👉 Example: Sending a POST request to /wp-json/wp/v2/posts with the right authentication creates a new blog post.
How to Access the WordPress REST API
1. Default Access
Every WordPress site has REST API enabled by default.
Example: