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Home > Web Development > CMS > Learning WordPress REST API
Learning WordPress REST API
Learning WordPress REST API

Learning WordPress REST API: A practical tutorial to get you up and running with the revolutionary WordPress REST API

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Learning WordPress REST API

Chapter 2. Interacting with REST API in WordPress

In the previous chapter, we became familiar with the basics of REST API, how RESTful services work, and how to issue and manage basic REST commands in different languages and using different methods.

Now that the introduction is out of the way, it is time for us to actually get started with REST API in WordPress. In the last chapter, we have seen the benefits of using REST API in WordPress and all that it can bring to the table in terms of features.

Starting from this chapter, we will now be seeing how to use REST API when working with WordPress. This chapter will introduce you to basic GET and POST requests and then will teach you how to deal with posts in WordPress via REST API. Furthermore, you will also learn how to handle posts, post metadata or meta fields, and then copy posts from one remote site to another.

Getting started

First up, you will need to set up your WordPress website. Obviously, you should not use a production site for learning purposes; therefore, I will strongly advise you to set up a test installation of WordPress for experimenting and playing with REST API. Depending on your mode of operation, you may choose to do it the way it suits you—some developers prefer having a local version of WordPress running on their device, whereas others, such as myself, set up WordPress live on a test server and access it accordingly.

You might also do it via Vagrant, if that suits you.

You may then install the WordPress REST API plugin much like any other normal plugin. Find the latest version at https://wordpress.org/plugins/rest-api/.

That said, let us get started with REST requests in WordPress. As we have seen in the last chapter, REST requests generally revolve around the four common HTTP transport methods: GET, PUT, POST, and DELETE. Plus, we have also learned that GET and POST requests...

Issuing requests via Postman

The biggest and most obvious advantage of Postman is that it allows you to turn requests into code snippets that you can use and reuse within your code. Thus, Postman can be used to export requests as JavaScript, and that makes it the perfect fit when working with REST API for WordPress or web development.

Postman lets you send authenticated requests in a native manner. In Google Chrome, once you have installed and activated the Postman extension, you can start sending HTTP requests.

Postman supports multiple HTTP requests, and you can see that directly in the drop-down menu.

Issuing requests via Postman

Of course, for our purpose, the GET and POST requests are the most important.

To issue an HTTP request via Postman, you need to enter the URL value and specify the parameters, if any. For instance, a GET request to a sample URL would look like as shown in the following screenshot:

Issuing requests via Postman

The preceding requests give us raw response in HTML code. You can also see the same response in JSON, XML, or text...

HTTP API in WordPress

As the name suggests, in WordPress, the HTTP API can be used to simplify HTTP requests. It can let you make HTTP requests via PHP, either to the same site or to a different site. But more importantly, HTTP API in WordPress lets you transform URL strings into JSON objects.

Consider the following URL string: http://example.com/wp-json/wp/v2/posts.

It is like any other URL on the Internet. Now, with HTTP API, we can convert it into a JSON object, making use of the wp_remote_get () function from the WordPress core:

$json = wp_remote_get ( 'http://example.com/wp-json/wp/v2/posts' );

Now, $json will yield an array, and that is precisely the response that we need.

To understand it better, let us now put together a very small function that accepts a URL string and then gives an array of post objects:

$response = wp_remote_get( $url ); 
function get_json( $url ) { 
//GET remote site 
$response = wp_remote_get( $url ); 
//Checking for errors 
if ( is_wp_error( $response...

Fetching GET post output in JSON objects

So far, we have seen how to GET posts and JSON objects. The preceding queries are sufficient to fetch (or GET) data for you, but how will you output the posts?

In WordPress, we often output posts by using the get_post() function that uses the global $post object. In a similar manner, we can use a loop that runs through all the posts retrieved by REST API and outputs them accordingly. For example, consider the following code:

$url = add_query_arg( 'per_page', 10, rest_url() ); 
$posts = get_json( $posts ); 
if ( ! empty( $posts ) ) { 
  foreach( $posts as $post ) { ?> 
  <article id="<?php echo esc_attr($post->ID ); ?>"> 
    <h1><?php echo $post->title; ?></h1> 
    <div><?php wpautop( $post->content ); ?></div> 
 
  </article> 
<?php } //foreach 
}

Looking at the outcome of this loop when used within a standard function, this is how it will work (the test site...

Getting started

First up, you will need to set up your WordPress website. Obviously, you should not use a production site for learning purposes; therefore, I will strongly advise you to set up a test installation of WordPress for experimenting and playing with REST API. Depending on your mode of operation, you may choose to do it the way it suits you—some developers prefer having a local version of WordPress running on their device, whereas others, such as myself, set up WordPress live on a test server and access it accordingly.

You might also do it via Vagrant, if that suits you.

You may then install the WordPress REST API plugin much like any other normal plugin. Find the latest version at https://wordpress.org/plugins/rest-api/ .

That said, let us get started with REST requests in WordPress. As we have seen in the last chapter, REST requests generally revolve around the four common HTTP transport methods: GET, PUT, POST, and DELETE. Plus, we have also learned that GET and POST requests...

Issuing requests via Postman

The biggest and most obvious advantage of Postman is that it allows you to turn requests into code snippets that you can use and reuse within your code. Thus, Postman can be used to export requests as JavaScript, and that makes it the perfect fit when working with REST API for WordPress or web development.

Postman lets you send authenticated requests in a native manner. In Google Chrome, once you have installed and activated the Postman extension, you can start sending HTTP requests.

Postman supports multiple HTTP requests, and you can see that directly in the drop-down menu.

Of course, for our purpose, the GET and POST requests are the most important.

To issue an HTTP request via Postman, you need to enter the URL value and specify the parameters, if any. For instance, a GET request to a sample URL would look like as shown in the following screenshot:

The preceding requests give us raw response in HTML code. You can also see the same response in JSON, XML, or...

HTTP API in WordPress

As the name suggests, in WordPress, the HTTP API can be used to simplify HTTP requests. It can let you make HTTP requests via PHP, either to the same site or to a different site. But more importantly, HTTP API in WordPress lets you transform URL strings into JSON objects.

Consider the following URL string: http://example.com/wp-json/wp/v2/posts.

It is like any other URL on the Internet. Now, with HTTP API, we can convert it into a JSON object, making use of the wp_remote_get () function from the WordPress core:

$json = wp_remote_get ( 'http://example.com/wp-json/wp/v2/posts' );

Now, $json will yield an array, and that is precisely the response that we need.

To understand it better, let us now put together a very small function that accepts a URL string and then gives an array of post objects:

$response = wp_remote_get( $url ); 
function get_json( $url ) { 
//GET remote site 
$response = wp_remote_get( $url ); 
//Checking for errors 
if ( is_wp_error...
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Key benefits

  • Learn how to run the latest WordPress REST API with various platforms
  • Create exciting apps and manage non-WordPress content with them
  • Secure, export, and manage your data through illustrative examples

Description

The WordPress REST API is a recent innovation that has the potential to unlock several new opportunities for WordPress developers. It can help you integrate with technologies outside of WordPress, as well as offer great flexibility when developing themes and plugins for WordPress. As such, the REST API can make developers’ lives easier. The book begins by covering the basics of the REST API and how it can be used along with WordPress. Learn how the REST API interacts with WordPress, allowing you to copy posts and modify post metadata. Move on to get an understanding of taxonomies and user roles are in WordPress and how to use them with the WordPress REST API. Next, find out how to edit and process forms with AJAX and how to create custom routes and functions. You will create a fully-functional single page web app using a WordPress site and the REST API. Lastly, you will see how to deal with the REST API in future versions and will use it to interact it with third-party services. By the end of the book, you will be able to work with the WordPress REST API to build web applications.

Who is this book for?

This book is for WordPress developers and designers who want to get a complete practical understanding of the WordPress REST API and leverage it to create fully-featured web apps.

What you will learn

  • * Use the WordPress REST API to read, write, and edit posts
  • * Create and work with metadata using the WordPress REST API
  • * Work with taxonomies using the REST API
  • * Add custom routes and build apps using the WordPress REST API
  • * Process requests and integrate with external applications and frameworks
  • * Make your WordPress projects ready for the RESTful API standard

Product Details

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Publication date : Jul 28, 2016
Length: 216 pages
Edition : 1st
Language : English
ISBN-13 : 9781786460233
Vendor :
WordPress Foundation
Category :
Web Development
Languages :
PHP
Concepts :
CMS
Tools :
WordPress

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Publication date : Jul 28, 2016
Length: 216 pages
Edition : 1st
Language : English
ISBN-13 : 9781786460233
Vendor :
WordPress Foundation
Category :
Web Development
Languages :
PHP
Concepts :
CMS
Tools :
WordPress

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Table of Contents

9 Chapters
1. Getting Started with REST API Chevron down icon Chevron up icon
1. Getting Started with REST API
Introducing REST API
Using REST API in real-world applications
Key considerations when working with REST
Getting started with REST implementation
Using REST in different programming languages
REST API in WordPress
Summary
2. Interacting with REST API in WordPress Chevron down icon Chevron up icon
2. Interacting with REST API in WordPress
Getting started
Issuing requests via Postman
HTTP API in WordPress
Fetching GET post output in JSON objects
Interacting REST API via PHP
Issuing POST requests
Summary
3. Working with Taxonomies and Users with REST API Chevron down icon Chevron up icon
3. Working with Taxonomies and Users with REST API
Working with taxonomies in WordPress using REST API
Implementing REST API and JavaScript with taxonomies
Working with users in WordPress using REST API
Summary
4. Working with Forms Using REST API Chevron down icon Chevron up icon
4. Working with Forms Using REST API
Overview
Fundamentals
Setting up the plugin
Summary
5. Custom Routes in WordPress REST API Chevron down icon Chevron up icon
5. Custom Routes in WordPress REST API
Overview
Adding custom routes to WordPress REST API
Setting up the custom route
Setting up the custom endpoints
Processing requests (and responses)
Summary
6. Creating a Simple Web App using WordPress REST API Chevron down icon Chevron up icon
6. Creating a Simple Web App using WordPress REST API
Overview
Setting up your WordPress site
Steps to disable the default routes
More about WP REST API
The REST architecture
Going further
WP REST API – setting up and using basic authentication
JavaScript authenticated requests
WP HTTP API for authenticated requests
WP REST API - setting up and using advanced authentication
Assessing the availability of the OAuth API
WP REST API - retrieving data
WP REST API: creating and editing posts
WP REST API: internals and customization
Summary
7. Mastering REST API for Your Projects Chevron down icon Chevron up icon
7. Mastering REST API for Your Projects
Backward compatibility
A universal API
Architectural structure
REST architectural constraints
Ever-growing REST API
REST API as a platform
REST API in later versions of WordPress
REST API and WordPress plugin development
REST API-based authentication
REST API and security
REST API being used in WordPress plugins
Disabling REST API
Summary
8. WordPress REST API in Practice Chevron down icon Chevron up icon
8. WordPress REST API in Practice
Key differences between v1 and v2 of the plugin
Internal changes
External changes
Future changes
Functions of APIs
The REST API in theory
A guide to HTTP and REST
The WordPress REST API
The JSON REST API
Developers of WP REST API
REST API revenue sources
Competing architectures on the Web
JavaScript and WordPress
AJAX in WordPress
Things to consider when using REST API
Current status of REST API
Progressive enhancement of WP REST API
WordPress Calypso and the REST API
Securing a REST API
WordPress API and regular users
Building your own API
Drawbacks of a custom API
Custom API tokens
Summary
9. Summing It Up Chevron down icon Chevron up icon
9. Summing It Up
Comparison of REST API with XML-RPC
XML-RPC usage in WordPress
REST API token-based authentication
Making sure your apps and sites are backward-compatible
The future of REST API
Limitations of REST API
Summary

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(2 Ratings)
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1 star 100%
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Not a book for learning the API. Very poor description about what can be done and how. Lots of promises to show you later and lots of repetition.
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PapyEt Jun 04, 2018
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ne vous fiez pas au contenu présenté en couverture...très grosse déception... il n'y a pas grand chose dans ce livre; un conseil cherchez des tutos sur internet vous serez mieux formés
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About the authors

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Profile icon Sufyan bin Uzayr
Sufyan bin Uzayr
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Sufyan bin Uzayr is a writer, teacher, and developer with 10+ years of experience in the industry. He is an open source enthusiast and specializes in a wide variety of technologies. He holds four master's degrees and has authored multiple books. Sufyan is an avid writer. He regularly writes about topics related to coding, tech, politics, and sports. He is a regular columnist for various publications and magazines. Sufyan is the CEO of Parakozm, a software development company catering to a global clientele. He is also the CTO at Samurai Servers, a web server management company focusing mainly on enterprise-scale audiences. In his spare time, Sufyan teaches coding and English to young students. Learn more about his works at his website - sufyanism.
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  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.

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