How can I add individual notes for each item in my cart?

Shopify Apps

Topic summary

A developer built a Shopify theme app extension allowing customers to customize individual items (e.g., personalized text on hats) but encountered a challenge: adding unique notes for each cart item rather than one note for the entire cart.

Key Points:

  • Initial confusion: Cart notes in Shopify apply to the whole cart, not individual line items
  • Solution found: Use line item properties by adding name="properties[Text]" with form="product-form-{section.id}" in the product form
  • This approach stores custom data as key-value pairs in the line item’s customAttributes field (GraphQL) or properties field

Current Status:

  • Original poster confirmed the solution works successfully
  • Another user requested clarification on implementation details and code placement

Note: Some text in the conversation appears reversed/encoded but the core technical solution involves using Shopify’s line item properties feature rather than cart-level notes.

Summarized with AI on November 10. AI used: claude-sonnet-4-5-20250929.
4

Note is not a line item property - it a cart property. You have one note field for the whole cart. You need to add your custom items in the line item “properties” field (or customAttributes field in GraphQL) - which is an object with “key” and “value” fields.