Properties ending with `[]` are not turned into an array, even with the `multiples: true` option

Support plan

• which support plan is this issue covered by? (e.g. Community, Sponsor, or Enterprise): community
• is this issue currently blocking your project? (yes/no): no
• is this issue affecting a production system? (yes/no): yes

Context

• node version: 12.16.2
• module (formidable) version: 1.2.2
• environment (e.g. node, browser, native, OS): node
• used with (i.e. popular names of modules):
• any other relevant information:

What are you trying to achieve or the steps to reproduce?

Parsing formdata with multiples: true does not actually result in an array of values.

Here’s the formdata (minus the file):

-----------------------------40560332322476987903819948371
Content-Disposition: form-data; name="number"

2019-482
-----------------------------40560332322476987903819948371
Content-Disposition: form-data; name="followed_workshop"

none_ext
-----------------------------40560332322476987903819948371
Content-Disposition: form-data; name="categories[]"

architecture
-----------------------------40560332322476987903819948371
Content-Disposition: form-data; name="categories[]"

product

And here’s the code that’s processing it:

let form = new formidable.IncomingForm({multiples: true});

form.hash = 'md5';

form.parse(req, function parsedMultipart(err, form_fields, form_files) {
	console.log(form_fields);
});

What was the result you got?

The resulting form_fields object looks like this:

{
    "categories[]": "product",
    "followed_workshop": "none_ext",
    "number": "2019-482"
}

What result did you expect?

Instead of a categories[] property, I expected a categories property with an array of all the submitted values.

[IonelLupu]

@GrosSacASac I retested the code and it seems it’s now working as expected. I don’t know what was the issue before. I guess we can close this now

[IonelLupu]

@nawawishkid-old I just tried formidable@canary as well, right now, and I get the same thing I said in the previous comment:

form.parse(incomingMessage, (error, content, formidableFiles) => {
  // formidableFiles is an object with the keys containing `[]` and the end for multiple media files, even if the value is an array
})

As show in the image below

I think the media[] key shouldn’t have the [] string at the end