New: Support for Nested Cart Lines
Discover the Update: Real-World Impact in Plain English
If you’ve ever shopped online and added additional services like a gift wrap or engraving to your purchase, you have tasted the magic of nested cart lines. This new feature from Shopify lets merchants create a parent-child relationship between main products and their add-ons. For example, purchasing a laptop might now seamlessly include various optional warranties or accessories listed as separate, yet connected, items in your cart. This cutting-edge update provides a tidy and organized shopping experience for customers, simplifying choices and enhancing satisfaction.
Let’s Talk on Tech Side
For developers diving into Shopify’s latest offering, the nested cart lines introduce enhanced capabilities to build richer, more dynamic eCommerce solutions. The Cart AJAX API now supports this feature, and it’ll be extended to the Storefront API and Checkout UI Extensions as of version 2025-10. With this update, nested (child) lines can reference their primary product using a new parent field. Here’s a quick look at the code:
// Example for Cart AJAX API
{
"line_items": [
{
"id": "123",
"variant_id": "456",
"quantity": 1,
"parent_line_key": "789" // Reference parent line
}
]
}
// Example for Storefront API
{
"lineItems": {
"edges": [
{
"node": {
"id": "abc",
"parent": {
"lineId": "def" // Referencing parent line
}
}
}
]
}
}This structured data not only organizes cart items more effectively but also provides clear, flexible options for customizing purchases.
Business Growth Unleashed: What This Means for Merchants
With the introduction of nested cart lines, Shopify merchants can now present their products with associated services more strategically, driving higher cart values and better cross-sell opportunities. Retailers can attach extra items like insurance for electronics, setup services for furniture, or personalized engravings for jewelry, which previously required more cumbersome workarounds or separate listings.
By simplifying how these additional offerings are managed in the backend, this update elevates the customer’s journey, reducing friction and decision fatigue during checkout. For businesses, this means a more compelling product suite and potential uplift in revenue per transaction, as customers can easily add complementary services or products to their cart.
Trident Spark: Your Trusted Shopify Innovation Partner
At Trident Spark, we are at the forefront of integrating Shopify’s latest advancements to empower your business. Our team of expert developers brings extensive experience in optimizing your online storefronts with the latest in eCommerce technology. We specialize in custom app development and seamless migrations, ensuring that your store is always on the cutting edge of what Shopify has to offer.
Connect with Trident Spark Today!
Are you ready to take advantage of Shopify’s new nested cart lines feature? Reach out to Trident Spark to see how we can tailor this to fit your unique business needs. Our team is eager to assist with seamless upgrades or bespoke solutions that will propel your store to new heights.