Update Cart Item

Change quantity or variant of a cart item.

Updated March 29, 2026

On this page

Overview

Update the quantity of an item already in the cart.

SDK Usage

typescript

import dash from "@/lib/dash"

// Set quantity to 3
await dash.cart.update("size_1g", 3)

The first argument is the sizeId of the item to update. The second is the new quantity.

typescript

"use client"
import dash from "@/lib/dash"

export function QuantitySelector({ sizeId, currentQty, onUpdate }) {
  async function changeQty(newQty: number) {
    if (newQty  1) return
    await dash.cart.update(sizeId, newQty)
    onUpdate() // Refresh cart display
  }

  return (
    <div className="flex items-center gap-2">
      <button onClick={() => changeQty(currentQty - 1)}>-</button>
      <span>{currentQty}</span>
      <button onClick={() => changeQty(currentQty + 1)}>+</button>
    </div>
  )
}

Update Cart Item

Update Cart Item

Overview

SDK Usage

Quantity Selector Example

REST API

Next Steps