Using parseWithZod with a formData that has an array of strings

[yoni-noma]

Describe the bug and the expected behavior

im sending an array of strings trough the network using formData with a value:
formData.set('classifications', JSON.stringify(['foo','bar','baz']))
And when recieving it on the server(remix action) im using parseWithZod(request.formData) with a matching schema:

export function DatasetClassificationsInputSchema(): z.ZodObject<
  Properties<DatasetClassificationsInput>
> {
  return z.object({
    classifications: z.array(z.string().nullable()),
    datasetId: z.string(),
  });
}

but when looking at the outcome of:

  const submission = parseWithZod(formData, {
    schema: DatasetClassificationsInputSchema,
  });

im seeing that it doesnt parse the array corretly, it looks like this:

{
   "status": "success",
   "payload": {
       "classifications": "[\"foo\",\"bar\",\"baz\"]",
       "datasetId": "RSBgsakUBc8WjMay1_re3"
   },
   "value": {
       "classifications": [
           "[\"foo\",\"bar\",\"baz\"]"
       ],
       "datasetId": "RSBgsakUBc8WjMay1_re3"
   }
}

What you can see here is an array that his first value is a stringify Array. instead of just array of values

Conform version

"@conform-to/react": "^1.1.5"

Steps to Reproduce the Bug or Issue

try to use parseWithZod on a formData with an array

What browsers are you seeing the problem on?

No response

Screenshots or Videos

No response

Additional context

No response

[marcomuser]

What's your specific use-case? Why do you set formData like this imperatively on the formData object? Just trying to understand because the result is what I had expected from looking at the example. 🤔

From my understand, with FormData array values are usually transformed to comma separated strings, e.g.:

const formData = new FormData();
formData.set("classifications", ["foo", "bar"])

would lead to a key value pair of:

["classifications", "foo, bar"]

[edmundhung]

I guess you are looking for formData.append() which could be used like this:

formData.append('classifications', 'foo');
formData.append('classifications', 'bar');
formData.append('classifications', 'baz');

[yoni-noma]

Thanks, yes, i thought i can use "set" if i know the entire value of the array i want to set, but i guess ill use append for each item