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feat(medusa): add inventory_quantity support for cart items variants in store API #13945

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c6cc5f5
✨ Add inventory_quantity support for cart items variants in store API
Nov 3, 2025
91e06ad
🔧 Add changeset
Nov 3, 2025
390f1c8
🔧 Add changeset
bqst Nov 3, 2025
077fd72
✨ Add inventory_quantity support across all store cart routes
bqst Nov 6, 2025
391e0ae
🐛 Fix refetchCart fieldsToFetch
bqst Nov 6, 2025
3a5563c
🔧 Update changeset
bqst Nov 6, 2025
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6 changes: 6 additions & 0 deletions .changeset/gold-snakes-shave.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
"integration-tests-http": patch
"@medusajs/medusa": patch
---

feat(medusa): add inventory_quantity support for cart items variants in store API
303 changes: 303 additions & 0 deletions integration-tests/http/__tests__/cart/store/cart.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,309 @@ medusaIntegrationTestRunner({

expect(response.response.status).toEqual(404)
})

describe("with inventory items", () => {
let stockLocation, inventoryItem1, inventoryItem2

beforeEach(async () => {
stockLocation = (
await api.post(
`/admin/stock-locations`,
{ name: "test location" },
adminHeaders
)
).data.stock_location

await api.post(
`/admin/stock-locations/${stockLocation.id}/sales-channels`,
{ add: [salesChannel.id] },
adminHeaders
)

inventoryItem1 = (
await api.post(
`/admin/inventory-items`,
{ sku: "test-sku-1" },
adminHeaders
)
).data.inventory_item

inventoryItem2 = (
await api.post(
`/admin/inventory-items`,
{ sku: "test-sku-2" },
adminHeaders
)
).data.inventory_item

await api.post(
`/admin/inventory-items/${inventoryItem1.id}/location-levels`,
{
location_id: stockLocation.id,
stocked_quantity: 100,
},
adminHeaders
)

await api.post(
`/admin/inventory-items/${inventoryItem2.id}/location-levels`,
{
location_id: stockLocation.id,
stocked_quantity: 50,
},
adminHeaders
)
})

it("should return inventory quantity for cart items when variant's manage_inventory is true", async () => {
const productWithInventory = (
await api.post(
`/admin/products`,
{
title: "Product with inventory",
status: ProductStatus.PUBLISHED,
options: [
{
title: "Size",
values: ["S"],
},
],
variants: [
{
title: "S",
sku: "product-with-inventory-s",
options: {
Size: "S",
},
manage_inventory: true,
inventory_items: [
{
inventory_item_id: inventoryItem1.id,
required_quantity: 10,
},
{
inventory_item_id: inventoryItem2.id,
required_quantity: 5,
},
],
prices: [
{
amount: 1000,
currency_code: "usd",
},
],
},
],
shipping_profile_id: shippingProfile.id,
},
adminHeaders
)
).data.product

const productWithoutInventory = (
await api.post(
`/admin/products`,
{
title: "Product without inventory",
status: ProductStatus.PUBLISHED,
options: [
{
title: "Size",
values: ["M"],
},
],
variants: [
{
title: "M",
sku: "product-without-inventory-m",
options: {
Size: "M",
},
manage_inventory: false,
prices: [
{
amount: 1000,
currency_code: "usd",
},
],
},
],
shipping_profile_id: shippingProfile.id,
},
adminHeaders
)
).data.product

const cart = (
await api.post(
`/store/carts`,
{
currency_code: "usd",
sales_channel_id: salesChannel.id,
region_id: region.id,
items: [
{
variant_id: productWithInventory.variants[0].id,
quantity: 2,
},
{
variant_id: productWithoutInventory.variants[0].id,
quantity: 1,
},
],
},
storeHeaders
)
).data.cart

const response = await api.get(
`/store/carts/${cart.id}?fields=+items.variant.inventory_quantity,+items.variant.manage_inventory`,
storeHeaders
)

expect(response.status).toEqual(200)
expect(response.data.cart).toEqual(
expect.objectContaining({
id: cart.id,
items: expect.arrayContaining([
expect.objectContaining({
variant_id: productWithInventory.variants[0].id,
quantity: 2,
variant: expect.objectContaining({
manage_inventory: true,
inventory_quantity: 10, // min(100/10, 50/5) = min(10, 10) = 10
}),
}),
expect.objectContaining({
variant_id: productWithoutInventory.variants[0].id,
quantity: 1,
variant: expect.objectContaining({
manage_inventory: false,
}),
}),
]),
})
)

// Verify that product without inventory management doesn't have inventory_quantity
const itemWithoutInventory = response.data.cart.items.find(
(item) =>
item.variant_id === productWithoutInventory.variants[0].id
)
expect(itemWithoutInventory.variant.inventory_quantity).toEqual(
undefined
)
})

it("should return correct inventory quantity for multiple stock locations", async () => {
const stockLocation2 = (
await api.post(
`/admin/stock-locations`,
{ name: "test location 2" },
adminHeaders
)
).data.stock_location

await api.post(
`/admin/stock-locations/${stockLocation2.id}/sales-channels`,
{ add: [salesChannel.id] },
adminHeaders
)

const inventoryItem3 = (
await api.post(
`/admin/inventory-items`,
{ sku: "test-sku-3" },
adminHeaders
)
).data.inventory_item

await api.post(
`/admin/inventory-items/${inventoryItem3.id}/location-levels`,
{
location_id: stockLocation.id,
stocked_quantity: 20,
},
adminHeaders
)

await api.post(
`/admin/inventory-items/${inventoryItem3.id}/location-levels`,
{
location_id: stockLocation2.id,
stocked_quantity: 30,
},
adminHeaders
)

const productMultiLocation = (
await api.post(
`/admin/products`,
{
title: "Product multi location",
status: ProductStatus.PUBLISHED,
options: [
{
title: "Size",
values: ["L"],
},
],
variants: [
{
title: "L",
sku: "product-multi-location-l",
options: {
Size: "L",
},
manage_inventory: true,
inventory_items: [
{
inventory_item_id: inventoryItem3.id,
required_quantity: 5,
},
],
prices: [
{
amount: 1000,
currency_code: "usd",
},
],
},
],
shipping_profile_id: shippingProfile.id,
},
adminHeaders
)
).data.product

const cart = (
await api.post(
`/store/carts`,
{
currency_code: "usd",
sales_channel_id: salesChannel.id,
region_id: region.id,
items: [
{
variant_id: productMultiLocation.variants[0].id,
quantity: 1,
},
],
},
storeHeaders
)
).data.cart

const response = await api.get(
`/store/carts/${cart.id}?fields=+items.variant.inventory_quantity`,
storeHeaders
)

expect(response.status).toEqual(200)
const cartItem = response.data.cart.items[0]
expect(cartItem.variant.inventory_quantity).toEqual(10) // (20 + 30) / 5 = 10
})
})
})

describe("POST /store/carts", () => {
Expand Down
6 changes: 3 additions & 3 deletions packages/medusa/src/api/store/carts/[id]/complete/route.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import { completeCartWorkflowId } from "@medusajs/core-flows"
import { prepareRetrieveQuery } from "@medusajs/framework"
import { MedusaRequest, MedusaResponse } from "@medusajs/framework/http"
import { MedusaStoreRequest, MedusaResponse } from "@medusajs/framework/http"
import { HttpTypes } from "@medusajs/framework/types"
import {
ContainerRegistrationKeys,
Expand All @@ -11,7 +11,7 @@ import { refetchCart } from "../../helpers"
import { defaultStoreCartFields } from "../../query-config"

export const POST = async (
req: MedusaRequest<{}, HttpTypes.SelectParams>,
req: MedusaStoreRequest<{}, HttpTypes.SelectParams>,
res: MedusaResponse<HttpTypes.StoreCompleteCartResponse>
) => {
const cart_id = req.params.id
Expand Down Expand Up @@ -53,7 +53,7 @@ export const POST = async (
defaults: defaultStoreCartFields,
}
).remoteQueryConfig.fields
)
, req)

if (!statusOKErrors.includes(error?.type)) {
throw error
Expand Down
4 changes: 2 additions & 2 deletions packages/medusa/src/api/store/carts/[id]/customer/route.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
import { transferCartCustomerWorkflowId } from "@medusajs/core-flows"
import { HttpTypes } from "@medusajs/framework/types"

import {
AuthenticatedMedusaRequest,
MedusaResponse,
Expand All @@ -26,7 +25,8 @@ export const POST = async (
const cart = await refetchCart(
req.params.id,
req.scope,
req.queryConfig.fields
req.queryConfig.fields,
req
)

res.status(200).json({ cart })
Expand Down
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