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    Add custom validation in the input field in the system.xml

    Hello Friends!

    In this blog, we will learn how we can add custom validation in a field by creating custom validation class from jquery in system.xml.
    To add custom validation in a store configuration field, please follow the below steps:

    1. Create requirejs-config.js file inside the app/code/Vendor/CustomModule/view/adminhtml/ directory.

    var config = {
        config: {
            mixins: {
                'mage/validation': {
                    'Vendor_CustomModule/js/store-config/validator-rules-mixin': true

    2. Create validator-rules-mixin.js file inside the app/code/Vendor/CustomModule/view/adminhtml/web/js/store-config/ directory.

    ], function ($) {
        'use strict';
        return function (target) {
                function (value) {
                    return !(value.length < 16);
                $.mage.__('Please Enter 16 Digit Number.')
            return target;

    3. Create system.xml file inside the app/code/Vendor/CustomModule/etc/adminhtml/ directory. And add the validation class ‘validate-sixteen-digit’ in ‘Aadhaar Number’ field.

    <?xml version="1.0"?>
    <config xmlns:xsi="" xsi:noNamespaceSchemaLocation="../../../Config/etc/system_file.xsd">
            <tab id="vendorname" translate="label" sortOrder="10">
            <section id="custommodule" translate="label" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Custom Module Configuration</label>
                <group id="general" translate="label" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <field id="aadhaarnumber" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                        <label>Aadhaar Number</label>
                        <validate>required-entry <em>validate-sixteen-digit</em></validate>

    4. See the result in the below image.


    Hope this will be helpful. Thanks 🙂

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