How can I modify the checkout code now that checkout.liquid is deprecated?

Shopify Plus

Topic summary

Main issue: After checkout.liquid deprecation, the poster wants to alter checkout via Checkout Extensibility—specifically, add a span tag to the line item title and remove a string under a condition, tasks they previously handled with Liquid.

Guidance given: A respondent notes that creating and deploying a checkout extension requires a Shopify Partner account.

Suggested approach: For the specific title modification, the respondent recommends using Shopify Functions and points to the Cart Transform function (shopify.dev link provided).

Practical next steps: Consider working with a Shopify Partner to implement and deploy the customization.

Status/outcome: No code example or definitive confirmation was provided on achieving the exact markup/string change within Checkout Extensibility. The thread does not show a resolved solution and remains open-ended. No attachments or code snippets were shared.

Summarized with AI on January 15. AI used: gpt-5.
1

Hey! So, since checkout.liquid’s been deprecated, how can I change checkout code now? I’m looking into checkout extensibility but couldn’t find a resource that tells me how to change code for a core feature.

To be more specific, I’d like to add span tag to the line item title as well as to remove a string from the title when a certain condition is met. All that is pretty simple to achieve with liquid, but I can’t find a way to implement it. Does anyone have an idea of how this can be done or can direct me to a resource I can use?

2

Hi @Ryoshin ,

Checkout extension you need a partner account to create and deploy to your shop.

For your specific customization I would use Shopify Functions instead. https://shopify.dev/docs/api/functions/reference/cart-transform

Definitely find a partner to help you.