--- title: CartLineInput - Storefront API description: The input fields to create a merchandise line on a cart. api_version: 2025-10 api_name: storefront type: input-object api_type: graphql source_url: html: https://shopify.dev/docs/api/storefront/latest/input-objects/CartLineInput md: https://shopify.dev/docs/api/storefront/latest/input-objects/CartLineInput.md --- # Cart​Line​Input input\_object The input fields to create a merchandise line on a cart. ## Fields * attributes [\[Attribute​Input!\]](https://shopify.dev/docs/api/storefront/latest/input-objects/AttributeInput) An array of key-value pairs that contains additional information about the merchandise line. The input must not contain more than `250` values. * merchandise​Id [ID!](https://shopify.dev/docs/api/storefront/latest/scalars/ID) non-null The ID of the merchandise that the buyer intends to purchase. * parent [Cart​Line​Parent​Input](https://shopify.dev/docs/api/storefront/latest/input-objects/CartLineParentInput) The parent line item of the cart line. * quantity [Int](https://shopify.dev/docs/api/storefront/latest/scalars/Int) Default:1 The quantity of the merchandise. * selling​Plan​Id [ID](https://shopify.dev/docs/api/storefront/latest/scalars/ID) The ID of the selling plan that the merchandise is being purchased with. *** ## Input objects using this input * [Cart​Input.lines](https://shopify.dev/docs/api/storefront/latest/input-objects/CartInput#fields-lines) INPUT OBJECT The input fields to create a cart. *** ## Map ### Input objects using this input * [Cart​Input.lines](https://shopify.dev/docs/api/storefront/latest/input-objects/CartInput#fields-lines)