Is it possible to create a custom validation for fields in configuration? (Stores > Settings > configuration)

I created a system.xml file but the default values for the validate tag are not enough for my needs and I would like to create my own rules.

I found an other question about this but it doesn't say how and where I should put/declare the validation method.

Is this possible or is the only solution to create a backend model with a beforeSave function?


1 Answer 1


As far as I know, if we want to add more custom validations. We should validate with beforeSave(). For example, take a look the cookie validation: vendor/magento/module-cookie/Model/Config/Backend/Lifetime.php.

We can add more Js validation for the user interface input.

A Sample to add Js validation for system xml:

In your module, create file the layout - adminhtml_system_config_edit.xml

enter image description here


<?xml version="1.0"?>

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        <referenceContainer name="js">
            <block class="Magento\Backend\Block\Template" 

Remember to add your custom validation in the template.

  • Thanks for the help. I used the beforesave function in a backend model to validate my fields. But your solution seems
    – Thomas F
    Commented Feb 20, 2017 at 9:08

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