Change a variant's title

PATCH /products/{productId}/variants/{variantId}

Change a variant's title, its option selection, or — for a kit (composite) — its recipe (components), trade codes (409 BarcodeConflict), measurements and order rules (null clears); those on a stocked variant are 409 VariantNotComposite, being its item's.

The SKU is not editable: a new SKU is a new variant. Appends inventory.variant-updated. Idempotent by content: a retry that changes nothing is acknowledged and appends nothing.

Access

Requires products:write.

How scopes come from roles: Scopes and roles. Getting a token: Authentication and app tokens.

Retries

Idempotent by content: a retry that changes nothing is acknowledged and appends nothing.

Why every write carries a key: Idempotency and retries.

Facts appended

inventory.variant-updated

What a fact is: Facts and the journal.

AI agent tool

Agents call this as catalog_update_variant (Catalog: Update variant), in the catalog toolset.

Connecting an agent: AI agents.

Example

Name the kit's variant and correct its packed weight.

curl

curl -X PATCH 'https://inventory.getmanifold.io/products/prd_019d4cb8-c230-7235-aee3-dcb05170df0e/variants/var_019d4cb8-c618-7383-84f4-8228073621c6' \
  -H "Authorization: Bearer $MANIFOLD_TOKEN" \
  -H 'Content-Type: application/json' \
  -d '{
  "title": "Twin pack",
  "weightGrams": 520
}'

JavaScript (fetch)

const response = await fetch("https://inventory.getmanifold.io/products/prd_019d4cb8-c230-7235-aee3-dcb05170df0e/variants/var_019d4cb8-c618-7383-84f4-8228073621c6", {
  method: "PATCH",
  headers: { Authorization: `Bearer ${process.env.MANIFOLD_TOKEN}`, "Content-Type": "application/json" },
  body: JSON.stringify({
    "title": "Twin pack",
    "weightGrams": 520
  }),
});
if (!response.ok) throw new Error(`${response.status}: ${await response.text()}`);
const answer = await response.json();

Request body · application/json

{
  "title": "Twin pack",
  "weightGrams": 520
}

Response · 200 · application/json

{
  "id": "prd_019d4cb8-c230-7235-aee3-dcb05170df0e",
  "title": "Widget twin pack",
  "description": "One blue and one red widget in a gift box.",
  "status": "active",
  "handle": "widget-twin-pack",
  "vendor": "Tidewater Supply Co.",
  "productType": "Widgets",
  "tags": [
    "Hardware",
    "Gift"
  ],
  "taxClass": "standard",
  "options": [],
  "variants": [
    {
      "id": "var_019d4cb8-c618-7383-84f4-8228073621c6",
      "sku": "WIDGET-PAIR",
      "title": "Twin pack",
      "options": [],
      "kind": {
        "_tag": "composite",
        "components": [
          {
            "sku": "WIDGET-BLUE",
            "quantity": 1
          },
          {
            "sku": "WIDGET-RED",
            "quantity": 1
          }
        ],
        "barcodes": [
          {
            "value": "9300000000033",
            "type": "gtin"
          }
        ],
        "hsCodes": [],
        "weightGrams": 520,
        "packedSize": {
          "lengthMm": 160,
          "widthMm": 120,
          "heightMm": 60
        }
      },
      "createdAt": "2026-04-02T05:44:30.000Z",
      "updatedAt": "2026-10-22T07:20:00.000Z"
    }
  ],
  "createdAt": "2026-04-02T05:44:30.000Z",
  "updatedAt": "2026-10-22T07:20:00.000Z"
}

The panel writes this call in other languages. It does not send it: Manifold's APIs do not take calls from a web page on another site, so run the call from your own code or terminal. The whole API as OpenAPI: inventory-manager.openapi.json. Base URL https://inventory.getmanifold.io.

Errors

Every refusal is a status and a JSON body whose _tag names it. A refused call changes nothing.

`401`

Refusal	What it means	What to do
`Unauthorized` reason	The token is missing, expired or not one Manifold issued.	Get a fresh token and send the call again.
`TokenAlreadyUsed` tokenId	A single-use app token was already spent.	Mint a new token for this call.

`402`

Refusal	What it means	What to do
`SubscriptionRequired` status	The organization's subscription has lapsed, so writes are refused.	An owner settles billing. Reads still work meanwhile.

`403`

Refusal	What it means	What to do
`TenantRequired` userId	The token names no organization.	Choose the organization, then get a new token.
`ScopeRequired` required	The token's roles do not grant the scope this call needs.	Ask an owner or admin for a role that grants it.

`404`

Refusal	What it means	What to do
`ProductNotFound` productId	No such record in this organization.	Check the id in the path or the body.
`VariantNotFound` sku	No such record in this organization.	Check the id in the path or the body.

`409`

Refusal	What it means	What to do
`ProductArchived` productId	The product is archived, and an archived product takes no changes.	Use a product that is not archived.
`VariantOptionsInvalid` productId, sku, reason	The variant's options do not fit the product's options. `reason` says how.	Send an option value for each of the product's options.
`VariantNotComposite` sku	The SKU is not a kit, so it has no recipe.	Check the SKU.
`SkuNotStocked` sku	The SKU is not stocked: it is a service or a kit, which holds no units.	Use a stocked SKU.
`BarcodeConflict` barcode, sku	Another SKU already has this barcode. `sku` names it.	Use another barcode, or take it off the other SKU first.
`MirroredFromSource` source	This area is fed by your source system until the organization goes live.	Make the change in the source system, or go live first.

`503`

Refusal	What it means	What to do
`RequestLogUnavailable` tokenId, reason	The service could not record the request, so it did nothing.	Send the same request again shortly.

How refusals work everywhere: Errors.