Here, we will discuss about how to add custom attribute in Magento 2 Category section.

I have created a custom module to add boolean type custom attribute.

Here, I have used MageMonkey as vendor and CustomCategorySettings as the module name.

Please follow below steps:

1. Create MageMonkey/CustomCategorySettings directories in app/code

2. Create registration.php file at app/code/MageMonkey/CustomCategorySettings/ and add following code:

<?php
\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'MageMonkey_CustomCategorySettings',
    __DIR__
);

<?php

\Magento\Framework\Component\ComponentRegistrar::register(

\Magento\Framework\Component\ComponentRegistrar::MODULE,

'MageMonkey_CustomCategorySettings',

__DIR__

);

3. Create module.xml file at app/code/MageMonkey/CustomCategorySettings/etc/ and add following code:

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="MageMonkey_CustomCategorySettings" setup_version="1.0.0">
        <sequence>
            <module name="Magento_Catalog"/>
        </sequence>
    </module>
</config>

</sequence>

</module>

</config>

4. Create InstallData.php file at app/code/MageMonkey/CustomCategorySettings/Setup/ and add following code:

<?php
namespace MageMonkey\CustomCategorySettings\Setup;
use Magento\Framework\Module\Setup\Migration;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Catalog\Setup\CategorySetupFactory;
 
class InstallData implements InstallDataInterface
{
    /**
     * Category setup factory
     *
     * @var CategorySetupFactory
     */
    private $categorySetupFactory;
 
    /**
     * Init
     *
     * @param CategorySetupFactory $categorySetupFactory
     */
    public function __construct(CategorySetupFactory $categorySetupFactory)
    {
        $this->categorySetupFactory = $categorySetupFactory;
    }
    /**
     * {@inheritdoc}
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $installer = $setup;
        $installer->startSetup();
 
        $categorySetup = $this->categorySetupFactory->create(['setup' => $setup]);
        $entityTypeId = $categorySetup->getEntityTypeId(\Magento\Catalog\Model\Category::ENTITY);
        $attributeSetId = $categorySetup->getDefaultAttributeSetId($entityTypeId);
        $categorySetup->removeAttribute(
        \Magento\Catalog\Model\Category::ENTITY, 'CUSTOM_ATTRIBUTE' );
        $categorySetup->addAttribute(
        \Magento\Catalog\Model\Category::ENTITY, 'CUSTOM_ATTRIBUTE', [
             'type' => 'int',
             'label' => 'CUSTOM ATTRIBUTE LABEL',
             'input' => 'boolean',
             'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',
             'required' => false,
             'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
             'group' => 'Custom Settings',
            ]
        );
$installer->endSetup();
    }
}

<?php

namespace MageMonkey\CustomCategorySettings\Setup;

use Magento\Framework\Module\Setup\Migration;

use Magento\Framework\Setup\InstallDataInterface;

use Magento\Framework\Setup\ModuleContextInterface;

use Magento\Framework\Setup\ModuleDataSetupInterface;

use Magento\Catalog\Setup\CategorySetupFactory;

class InstallData implements InstallDataInterface

{

/**

* Category setup factory

* @var CategorySetupFactory

private $categorySetupFactory;

/**

* Init

* @param CategorySetupFactory $categorySetupFactory

public function __construct(CategorySetupFactory $categorySetupFactory)

{

$this->categorySetupFactory = $categorySetupFactory;

}

/**

* {@inheritdoc}

* @SuppressWarnings(PHPMD.ExcessiveMethodLength)

public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)

{

$installer = $setup;

$installer->startSetup();

$categorySetup = $this->categorySetupFactory->create(['setup' => $setup]);

$entityTypeId = $categorySetup->getEntityTypeId(\Magento\Catalog\Model\Category::ENTITY);

$attributeSetId = $categorySetup->getDefaultAttributeSetId($entityTypeId);

$categorySetup->removeAttribute(

\Magento\Catalog\Model\Category::ENTITY, 'CUSTOM_ATTRIBUTE' );

$categorySetup->addAttribute(

\Magento\Catalog\Model\Category::ENTITY, 'CUSTOM_ATTRIBUTE', [

'type' => 'int',

'label' => 'CUSTOM ATTRIBUTE LABEL',

'input' => 'boolean',

'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',

'required' => false,

'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,

'group' => 'Custom Settings',

]

);

$installer->endSetup();

}

5. Create category_form.xml file at app/code/MageMonkey/CustomCategorySettings/view/adminhtml/ui_component/ and add following code:

<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <fieldset name="custom_settings">
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="label" xsi:type="string">Custom Settings</item>
                <item name="collapsible" xsi:type="boolean">true</item>
                <item name="sortOrder" xsi:type="number">99</item>
            </item>
        </argument>
        <field name="CUSTOM_ATTRIBUTE">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="dataType" xsi:type="string">boolean</item>
                    <item name="formElement" xsi:type="string">checkbox</item>
                    <item name="label" xsi:type="string" translate="true">CUSTOM ATTRIBUTE LABEL</item>
                    <item name="prefer" xsi:type="string">toggle</item>
                    <item name="valueMap" xsi:type="array">
                        <item name="true" xsi:type="string">1</item>
                        <item name="false" xsi:type="string">0</item>
                    </item>
                    <item name="default" xsi:type="number">0</item>
                </item>
            </argument>
        </field>    
    </fieldset>
</form>

<?xml version="1.0" encoding="UTF-8"?>

<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">

<item name="label" xsi:type="string">Custom Settings</item>

</item>

</argument>

<item name="dataType" xsi:type="string">boolean</item>

<item name="formElement" xsi:type="string">checkbox</item>

<item name="label" xsi:type="string" translate="true">CUSTOM ATTRIBUTE LABEL</item>

<item name="prefer" xsi:type="string">toggle</item>

</item>

</item>

</argument>

</field>

</fieldset>

</form>

6. Run following commands to enable this custom module.

php bin/magento setup:upgrade
php bin/magento cache:clean
php bin/magento cache:flush

Now, you can see in Magento 2 Admin > Catalog > Category

There will be a tab group “Custom Settings” in admin category as shown below.

Fill the below form if you have any Magento programming need.

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