GraphQL

If you're using Craft Pro, the included Product Details Field Type can be queried with Craft's native GraphQL. Use your Field Type handle and specify whichever product details you need:

myFieldHandle {
  sku
  price
  shippable
  taxable
  weight
  weightUnit
  length
  width
  height
  inventory
  dimensionsUnit
}

Example JSON result:

"myFieldHandle": {
  "sku": "infinity-gauntlet",
  "price": 499.98,
  "shippable": true,
  "taxable": false,
  "weight": 1360.776,
  "weightUnit": "grams",
  "length": 36,
  "width": 21,
  "height": 21,
  "inventory": null,
  "dimensionsUnit": "inches"
}