Grab Total Weight with Checkout UI Extension

Extensions
1

I am trying to access the total weight of an order in my Checkout UI Extension. Currently utilizing Javascript (React).

Doesn’t appear to be a way to do this easily without querying each line item.

There used to be a useOrder() we could utilize to easily get total order weight:

const order = useOrder();
order.lineItems.forEach(item => {
      totalWeight += item.weight * item.quantity; 
    });

This appears to possibly be deprecated though I couldn’t find proof of this?

I have tried to get total weight via the useCartLines():

 const totalWeight = cartLines.reduce((sum, line) => {
  const lineWeight = line.merchandise.weight?.value || 0;
  console.log('Line weight debug:', { productId: line.merchandise.product?.id, variantId: line.merchandise.id, weightValue: lineWeight, unit: line.merchandise.weight?.unit || 'none' });
  return sum + (lineWeight * line.quantity);
}, 0) / 1000; // In kg

However there is no merchandise.weight nor weight anywhere I found within useCartLines().

API Version I am using is latest at time of post 2025-07.

Any help would be appreciated, thank you.

2

Hi

Looking at the docs, useOrder() doesn’t look to be available on API versions after 2024-07, which is likely why it’s not working on 2025-07. Is querying each line item not a suitable option for performance reasons?