Update cart note with js-buy-sdk

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I am trying to update the cart note using custom GraphQL mutations and js-buy-sdk client

The documentation is poor regarding mutations and what I got it this so far:


const cartId = cartInstance.client.graphQLClient.variable('cartId', 'ID!');
const note = cartInstance.client.graphQLClient.variable('note', 'String!');

const noteMutation = cartInstance.client.graphQLClient.mutation('cartNoteUpdateMutation', [ cartId, note ], (root) => {
 root.add('cartNoteUpdate', { args: { cartId, note } }, (cartNoteUpdate) => {
    cartNoteUpdate.add('userErrors', (userErrors) => {

       cartId: cartInstance.id,
       note: 'Hello World!'
      .then((res) => {


When i run this i get a GraphQL error response: "invalid id"


I am using this mutation from the Storefront API reference - cartNoteUpdate


Note that the cartinstance.is in the code above is the checkoutId I get from the client. In the documentation this mutation needs CartId. Is cartId different from checkoutId ? If yes then where do i get the cartId from?







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