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Jonathan Bossenger
Let’s Code
Learn.WordPress.org
Extending the WP REST API - modifying responses

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👋🏽
Welcome!
As you join, please make sure you have your local
development environment ready:
• A local WordPress installation
• A code editor like VSCode or Sublime
• The example plugin
• https://github.com/jonathanbossenger/wp-
learn-rest-api/releases/download/0.0.4/wp-
learn-rest-api.0.0.4.zip
• Postman
https://www.postman.com/downloads/
Then, let everyone know in the chat where you’re
joining us from…
Hello!
○ My name is Jonathan Bossenger
○ From Cape Town, South Africa
○ Ex-developer turned code instructor
○ Sponsored contributor at Automattic
○ jonathanbossenger.com

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Learn.WordPress.org
Let's code!
The WP REST API -
modifying responses
Jonathan Bossenger

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Announcements
○ Welcome, and thank you to Mark for co-hosting!
○ We are presenting in focus mode, but please feel free to enable your video.
○ Please let me know if you can’t see this slide.
○ You are welcome to ask questions.
○ You are welcome to post questions in the chat, or unmute to ask questions.

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Announcements
○ Make sure your local install is ready
• https://github.com/jonathanbossenger/wp-learn-rest-
api/releases/download/0.0.4/wp-learn-rest-api.0.0.4.zip
• https://www.postman.com/downloads/
○ If I am going too fast, please let me know!
○ We will be posting this session to https://wordpress.tv/ afterwards
○ For more WordPress focused content please visit https://learn.wordpress.org/
○ Follow up questions/feedback - https://github.com/WordPress/Learn/issues/1283

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Learning Outcomes
1. Learn the different ways to add custom fields to the WP REST API
2. Enable custom meta fields for a WP REST API route
3. Add custom top level fields to a WP REST API route
4. Learn about REST API schema

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Objectives
1. Setup and review the example plugin code so far
2. Set up and test some API routes using Postman
3. Enable a custom field using register_meta
4. Add a custom field using register_rest_field
5. Add field schema to the custom field
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Let’s code.

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Resources
○ https://github.com/WordPress/Learn/issues/1283
○ https://github.com/jonathanbossenger/wp-learn-rest-api/releases/download/0.0.4/wp-learn-rest-
api.0.0.4.zip
○ https://www.postman.com/downloads/
○ https://developer.wordpress.org/rest-api/extending-the-rest-api/modifying-responses/
○ https://developer.wordpress.org/rest-api/using-the-rest-api/global-parameters/#_fields
○ https://developer.wordpress.org/reference/functions/register_meta/
○ https://developer.wordpress.org/reference/functions/register_rest_field/