How to Make a Custom Field Required Before Adding to Cart in Shopify

June 24, 2026

Custom fields required are often used to collect information that is essential for processing an order, such as personalization details, uploaded artwork, gift messages, or custom measurements. However, if these fields are left optional, customers can accidentally submit incomplete orders, forcing merchants to follow up for missing information before fulfillment can begin.

Fortunately, Shopify merchants can prevent this by making certain fields required before a product is added to the cart. Using either Shopify's built-in line item properties or a product options app, merchants can ensure customers provide the necessary information upfront, helping reduce fulfillment delays and improve order accuracy.

In this guide, we'll explore two common ways to make a custom field required before customers can add a product to their cart on Shopify.

Key Takeaways

You can make a custom field required before customers can add a product to cart in Shopify in two main ways: using custom code or using a product options app.
If you use a custom code approach, you can add JavaScript validation to your product page. This prevents customers from clicking the “Add to cart” button until all required fields are filled in.
If you prefer a no-code solution, apps like Easify Custom Product Options let you create required fields directly from the admin. You can set fields such as text inputs, dropdowns, checkboxes, image swatches, color swatches, and file uploads as required without editing any theme code.
Both approaches ensure customers must complete important product information before placing an order, but using an app is typically faster and easier to manage for non-technical users.

Why Make Custom Fields Required?

Making a custom field required helps ensure merchants receive all necessary information before an order is submitted.

Some key benefits include:

Reduce fulfillment errors: Prevent orders from being placed with missing customization details.
Improve customer experience: Customers know exactly what information is required before checkout.
Save time on follow-ups: Reduce the need to contact customers after purchase for missing information.
Ensure accurate personalization: Collect engraving text, names, measurements, uploaded files, or special requests before the order is processed.
Create a smoother workflow: Fulfillment teams can begin processing orders immediately without waiting for additional customer input.

How to Make a Custom Field Required Before Customers Can Add to Cart on Shopify?

There are two common approaches merchants can use depending on their store's needs and technical experience.

Method 1: Make a Custom Field Required Without an App

For merchants who prefer not to install an app, Shopify's line item properties can be combined with simple JavaScript validation to make a field required before a product can be added to the cart.

Step 1: Add the Custom Field to Your Product Form

From your Shopify admin: Online Store

Click the three dots next to your live theme and select Edit code.
Under the Sections or Snippets folder, locate your product form file. Depending on your theme, this is usually: main-product.liquid or buy-buttons.liquid
Inside the product form (<form> tag), add the following code above the Add to Cart button:

<label for="custom_name">Enter Name</label>

</div>

This creates a custom text field that customers must complete before adding the product to their cart.

*Note: The required attribute enables browser-based validation and prevents the form from being submitted if the field is left empty.

Step 2: Remove Shopify's Default Form Validation Override

Many Shopify themes include a novalidate attribute that disables the browser's built-in validation.

While still in the product form file (buy-buttons.liquid or main-product.liquid):

Press Ctrl + F (or Cmd + F on Mac)
Search for novalidate
Locate the product <form> element
Remove the novalidate attribute
Click Save

Once removed, the browser will enforce the required-field validation configured in Step 1.

Step 3: Test the Required Field

Open a product page and attempt to add the product to the cart without completing the custom field.

If everything is configured correctly:

Customers will see a validation message when the field is empty.
The product cannot be added to the cart until the required information is provided.
The entered value will be saved with the order as a Shopify line item property.

Limitations of This Method

While this approach works well for simple text-based fields, it does have some limitations:

Requires editing theme code
Must be configured manually for each customization setup
Limited support for advanced option types
No built-in conditional logic
No centralized management for multiple products

For merchants who need required dropdowns, checkboxes, image swatches, color swatches, file uploads, or more advanced product customization features, a dedicated product options solution may offer a more scalable alternative.

Method 2: Make a Custom Field Required Using Easify Product Options

For merchants who prefer a no-code setup, Easify Custom Product Options provides built-in validation settings that make custom fields required without modifying theme files.

Step 1: Install and Activate the App

Install Easify Custom Product Options from the Shopify App Store and complete the initial setup.

Step 2: Create an Option Set

Create a new Option Set to contain the custom fields you want to display on your products.

Step 3: Edit the Option

Add the option you want customers to complete before purchasing.

Depending on the use case, merchants can choose from various option types, including:

Step 4: Enable the Required Setting

Open the option settings and enable the Required option.

Once enabled, customers must complete that field before they can add the product to their cart.

For example:

Enter a name
Upload a design file
Select a product size
Choose a color swatch
Confirm terms using a checkbox

Step 5: Apply the Option Set to Products

Assign the Option Set to the products that require customer input.

This ensures the validation rules appear only where needed.

Step 6: Save Your Changes

Save the Option Set and preview the product page.

Try adding the product to the cart without completing the required field to verify that validation is working correctly.

Final Thoughts

Making custom fields required can help Shopify merchants collect important customer information before an order is placed, reducing fulfillment issues and creating a smoother purchasing experience.

For basic setups, merchants can use Shopify's built-in line item properties combined with custom validation code. However, as customization requirements become more complex, managing required fields through code can become difficult to maintain.

For stores that frequently collect personalization details, file uploads, customer selections, or other product customizations, a dedicated product options solution can provide a more flexible and scalable way to manage required fields without coding.

FAQs

Can I make a custom field required in Shopify?

Shopify merchants can make custom fields required before customers add a product to their cart. This can be achieved through custom theme code and form validation, or by using a product options app with built-in required field settings. Requiring important fields helps ensure customers provide all necessary information before placing an order, reducing fulfillment errors and follow-up requests.

What types of custom fields can be required?

The available field types depend on the solution being used. Merchants can commonly require:

Text fields
Dropdown menus
Checkboxes
Radio buttons
Image swatches
Color swatches
File uploads
Date pickers

This allows businesses to collect a wide range of information, from personalization details and custom measurements to design files and product selections.

Do required custom fields appear in Shopify orders?

Once an order is placed, the information entered by the customer is typically attached to the product and stored with the order. Merchants can view these details from the Shopify order details page during fulfillment, making it easier to access personalization requests, uploaded files, selected options, and other custom information needed to process the order accurately.

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