TutsPlus.com has posted the latest part of their series focusing on the WordPress REST API. In this new part of the series they look at some of the internals of the API code and the customizations you can make on the data returned.

In the previous part of the series, we learned about creating, updating, and deleting content remotely through the WP REST API. It allows us to create platform-independent applications that work seamlessly with a WordPress powered back-end, providing a rich experience to the user.

In the current part of the series, we will take a look at the internals of the WP REST API and how they work together to power the API. After that, we will learn to modify server responses for the default endpoints to include custom fields.

They walk you through a few different topics around the API including the internal classes that power it, how to modify the server and making custom fields editable. There's a bit of code involved when it comes to modifying the custom fields in the response and registering an editable field. The rest is mostly about configuration and what methods are doing what during the request.

The NetTuts.com site has a new tutorial posted showing you how to work with the authentication of the WordPress REST API and using its OAuth 1.0a handling. This is part three in their series of tutorials introducing the WordPress REST API.

In the previous part of the series, we set up basic HTTP authentication on the server by installing the plugin available on GitHub by the WP REST API team. [...] For using authentication on production servers, there needs to be a more secure way of sending authenticated requests without risking exposing the login credentials. Thanks to the OAuth authentication method, those requests can be sent without exposing the username and the password in an unsafe manner.

In the current part of the series, we will learn to set up and use the OAuth authentication method to be used with the WP REST API plugin.

They start the tutorial with a brief look at what OAuth is and how it's used to authenticate the end user/client/software/etc. They then walk through the flow of a simple OAuth-based authentication system and the pieces that make it up. Then the article gets into how to install the plugin for your WordPress instance and activate it from the command line. They show how to test that it's enabled and how to use a command line client to create tokens you can then use to access the API in your own clients.