Detect error when adding item to cart

[wialy]

Hello everyone,

I am currently working on the cart functionality using the swell-js frontend library. During the implementation, I encountered an issue with the addItem method, which sometimes fails due to currency settings. While this is an expected behavior, the problem is that I am unable to access the error information from the SDK level even though it is included in the network request.

As a result, the addItem method always returns a Promise<Cart> object with the cart contents, and there seems to be no way to catch this type of error. I have reviewed the documentation and codebase, but I have not found a solution to this problem. If anyone has any insights or suggestions, I would appreciate it.

swell-js SDK version: 3.21.2

try {
  await addItem({
    productId,
    quantity: 1,
    variantId,
  });

  // proceed with a positive scenario
} catch {
  // handle error
}

[greph]

Hi @wialy , what's the error/response you're seeing when using the addItem method? I take it it's not the standard error response (with code and message), else it would trigger the catch clause.

[wialy]

Hey @greph,

Thanks for picking up the topic and sorry for my late response.

The response comes with a 200 status code, however, the payload is:

{"errors":{"currency":{"message":"**My Product name** is not available in currency EUR","code":"INVALID","id":"**ID**"}}}

It seems like the issue is not with the client SDK, maybe REST API should use different status for this kind of error.

[logeshswell]

@wialy Yes, you're right! It would return 200 status code and you could handle it using response.errors object to confirm if there's an error in placing an item in the cart.
I would also take your feedback to replace it with error status codes (4xx) while versioning the API later.