Learn to develop custom Gutenberg blocks using React JS from an experienced developer. This guide covers setup, development, and deployment with practical code
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When I started my journey in web development, WordPress was often seen as a simple CMS, relying heavily on its classic editor and shortcodes. But as client needs grew more complex and user experience became paramount, the landscape evolved dramatically with the introduction of Gutenberg. While the standard library of blocks is extensive, I've often faced scenarios – especially when building custom solutions like the OpenWA WhatsApp Gateway for WooCommerce or sophisticated admin interfaces for plugins like Frontend File Explorer – where generic blocks just don't cut it.
That's where the power to develop custom Gutenberg blocks with React JS comes in. It's not just about adding new features; it's about creating highly tailored, intuitive editing experiences that perfectly align with your project's requirements. In my 8+ years of building WordPress plugins and React applications, I've found that mastering custom block development is an indispensable skill. It transforms the editor from a basic text field into a dynamic, component-driven layout builder.
This comprehensive guide isn't theoretical. It's built on real-world experience, showing you the exact steps I take to develop custom Gutenberg blocks with React JS, from initial setup to deployment. We'll dive into the "why" and "how," ensuring you gain the practical knowledge to build powerful, bespoke blocks for any WordPress project.
Why React JS is the Go-To for Custom Gutenberg Blocks
Before Gutenberg, extending the WordPress editor often involved clunky TinyMCE plugins or complex JavaScript. With Gutenberg, WordPress fully embraced React JS, which has revolutionized the way we interact with the editor. For me, this shift was a natural progression. Having built React-based Point of Sale applications and components for my Laravel School ERP, the component-driven architecture of React felt familiar and incredibly efficient for building complex UIs within the WordPress admin.
Here's why React JS is the perfect fit for custom Gutenberg block development:
Component-Based Architecture: React's philosophy of building reusable UI components directly aligns with the block paradigm. Each part of your block, from a simple text field to a complex dynamic data display, can be a self-contained component.
Modern Tooling: WordPress provides @wordpress/scripts, a wrapper around Webpack and Babel, making it easy to use modern JavaScript (ESNext), JSX, and SCSS without complex configuration. This mirrors the professional development setup I use for standalone React apps.
Performance: React's virtual DOM allows for efficient updates, leading to a smoother and more responsive editing experience. This is crucial when dealing with complex blocks that might have many controls or dynamic content.
Familiarity: If you're already working with React, the learning curve for Gutenberg development is significantly reduced, as you're leveraging existing skills and patterns.
In essence, using React JS for Gutenberg blocks means leveraging a powerful, modern framework that WordPress itself uses, ensuring your custom blocks are performant, maintainable, and fit seamlessly into the editor experience.
Prerequisites and Setting Up Your Development Environment
Before we dive into the code, let's ensure you have the necessary tools. This setup is pretty standard for modern WordPress plugin development, and it's what I rely on daily:
Local WordPress Installation: A development environment (like Laragon, Local by Flywheel, or Docker) with WordPress installed.
PHP (7.4+): For the server-side block registration.
Node.js (16+ recommended) and npm/Yarn: Essential for compiling your React code. Make sure they are installed and accessible from your terminal.
Basic knowledge of PHP, JavaScript (ESNext), and React JS: You don't need to be an expert, but familiarity with these concepts will make the process much smoother.
Initializing Your Custom Block Project
The easiest and most recommended way to start a new Gutenberg block is by using the official @wordpress/create-block package. It scaffolds all the necessary files and configurations, saving you a ton of time. This is precisely how I start new block projects, ensuring a consistent and up-to-date structure.
Navigate to your WordPress wp-content/plugins/ directory in your terminal and run the following command:
# Go to your WordPress plugins directory
cd /path/to/wordpress/wp-content/plugins/
# Run the create-block tool
npx @wordpress/create-block my-awesome-block
Replace my-awesome-block with your desired block name. This command will create a new directory (my-awesome-block) containing all the boilerplate files: PHP for registration, JavaScript/React for the editor and save functions, and SCSS for styling. It automatically sets up webpack and babel via @wordpress/scripts, so you're ready to start coding.
After creation, navigate into your new block directory and install dependencies:
cd my-awesome-block
npm install
Once installed, you can start the development server:
npm start
This command watches for changes and recompiles your block's assets. For production, you'll run npm run build.
Understanding the Anatomy of a Gutenberg Block
A custom Gutenberg block, especially one built with React JS, consists of several key files that work together. Understanding their roles is fundamental. When I developed the administration panels for my Frontend File Explorer plugin, or the intricate settings for OpenWA WhatsApp Gateway (which features an extensive plugin settings page with tabs and dynamic fields, similar in complexity to a block's inspector controls), I had to think about separating concerns, much like how these block files are structured:
block.json: This is the block's metadata file. It defines the block's name, title, description, category, icon, and crucially, its attributes. Attributes are essentially the data structure for your block's content and settings.
index.js: The entry point for your block's JavaScript. It registers the block using registerBlockType and imports the edit and save components.
edit.js: This React component defines how your block appears and behaves in the Gutenberg editor. It handles user interactions, updates attributes, and renders the block's editable interface.
save.js: This React component defines how your block's content is saved to the database. It renders the static HTML that will appear on the frontend.
style.scss: Contains styles applied to your block on both the editor and frontend.
editor.scss: Contains styles specifically for the block within the Gutenberg editor (e.g., visual cues for editable areas).
The @wordpress/create-block tool sets up these files automatically, providing a solid starting point for you to develop custom Gutenberg blocks with React JS.
Step-by-Step: How to Develop Custom Gutenberg Block with React JS
Let's walk through creating a simple, yet practical, custom block. We'll create a "Call to Action" block that allows users to input a title, description, and a button text/URL, with some styling options.
1. Initialize Your Block
As covered, run: npx @wordpress/create-block my-call-to-action-block. Activate the "My Awesome Block" plugin in your WordPress admin after running npm install and npm start.
2. Register the Block (PHP)
Open my-call-to-action-block.php in your plugin root. You'll see the register_block_type function. This function links your JavaScript and CSS assets to your block.
<?php
/**
* Plugin Name: My Call To Action Block
* Description: A simple custom Call To Action block for Gutenberg.
* Version: 1.0.0
* Author: Shafat Mahmud Khan
*/
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
/**
* Registers the block using the metadata loaded from `block.json`.
* It also registers all assets so they can be enqueued automatically.
*
* @see https://developer.wordpress.org/reference/functions/register_block_type/
*/
function my_call_to_action_block_init() {
// This will automatically enqueue the editor.css, style.css, and index.js files
// based on the asset definitions in block.json.
register_block_type( __DIR__ . '/build' );
}
add_action( 'init', 'my_call_to_action_block_init' );
The __DIR__ . '/build' part tells WordPress where to find your block.json file, which in turn references your compiled JavaScript and CSS assets. This is a clean, modern way to register blocks and manage assets, much more streamlined than manual enqueuing.
3. Define Block Attributes (block.json)
Open src/block.json. This file is crucial for defining the attributes your block will use to store data. Let's add attributes for a title, description, button text, and button URL.
Here, we define attributes like title, description, buttonText, buttonUrl, backgroundColor, and textColor. The source and selector properties tell Gutenberg how to extract these attributes from the saved HTML on the frontend.
4. Develop the Editor Component (src/edit.js)
This is where the React magic happens. We'll use components from the @wordpress/block-editor and @wordpress/components packages to build our editing interface. When I build complex input forms for managing settings in OpenWA (like setting up custom WhatsApp message templates), I mentally break down the UI into similar reusable components and attribute mapping.
In this edit.js, we use useBlockProps for standard block attributes, RichText for editable text content, and InspectorControls to add settings to the block sidebar. The ColorPalette and URLInputButton components from @wordpress/components make it easy to manage colors and URLs, providing a consistent UI experience.
5. Develop the Save Component (src/save.js)
The save.js component dictates the static HTML structure that will be stored in the database when the post is saved. It should generally mirror the structure of your edit.js, but without any editable components.
Notice how we use RichText.Content here. This component correctly renders the saved RichText content as static HTML. The styling attributes are applied inline to maintain the user's selections.
A simplified view of how your custom Gutenberg block comes to life, from the editable state in the editor to the static HTML saved for the frontend. This mirrors the separation of concerns I often implement in complex plugin UIs.
6. Styling Your Block (src/editor.scss and src/style.scss)
The create-block tool sets up two SCSS files:
src/editor.scss: For styles that should only apply within the editor (e.g., borders around editable areas, specific editor-only layout adjustments).
src/style.scss: For styles that apply to your block on both the editor and the frontend. This is where your primary block styling should go.
For our CTA block, let's add some basic styling to src/style.scss:
The .wp-block-create-block-my-call-to-action-block class is automatically generated based on your block name. You can use it as the root selector for your block's styles.
7. Advanced Concepts: Dynamic Blocks and Data Fetching
While our current CTA block is static (content saved directly to post_content), many real-world scenarios require dynamic content. For example, if I wanted to display real-time order statuses from WooCommerce using my OpenWA plugin, or fetch student data for my School ERP, a dynamic block would be essential. Dynamic blocks rely on PHP to render their content on the frontend.
To make a block dynamic, you remove the save.js file (or just return null from its save function) and instead provide a render_callback in your register_block_type function. This callback will receive the block's attributes and return the HTML to be displayed.
