5 common causes
- Property key starts with underscore (intentionally hidden)
- Cart-item.liquid missing properties loop
- Cart drawer JS overrides template
- App not adding properties on add-to-cart
- Wrong property syntax
cart-item.liquid template
{% for property in item.properties %}
{% unless property.first[0] == '_' %}
<div>{{ property.first }}: {{ property.last }}</div>
{% endunless %}
{% endfor %}Hidden underscore properties
Properties starting with _ (underscore) are hidden by Shopify convention. Used for print file URLs + metadata.
App conflict
Cart drawer app may override theme template. Check theme + app compatibility.
Frequently asked questions
Why doesn't cart show my personalization?
5 causes — underscore-prefix hides it, cart template missing loop, drawer JS overrides, app not adding, wrong syntax.
What are underscore line-item properties?
Hidden by Shopify convention. Used for metadata like print file URLs.
How to add properties loop to cart template?
Cart-item.liquid: {% for property in item.properties %}{{ property.first }}: {{ property.last }}{% endfor %}.
Cart drawer vs cart page?
Drawer uses JS. Page uses Liquid. Ensure both display properties.
App not adding properties?
Verify in personalizer dashboard. Test order end-to-end.
Wrong property syntax?
Must be properties[Field Name]. Case-sensitive. No leading/trailing spaces.
Photo upload URL in cart?
App stores URL as property. Cart template renders as image if value is URL.
Cart display in checkout?
Checkout auto-displays properties. Theme edit not needed for checkout.
Related reading
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