How to send an array of pdf files using form-data

[madhukiranvarma]

I'm trying to send an array of pdf files to backend using form-data lib

I was trying to append pdf files like this:

const formData = new FormData();
for (const file of files) {
       formData.append('file[]', fs.createReadStream(file.path), {
               filename: `${file.type}_${file.month}.pdf`,
        });
}

and this is the axios request

Axios.request({
        method: 'POST',
        url,
        headers: {
            'Content-Type': data.formData.getHeaders()['content-type'],
        },
        data: data.formData,
    });

but I'm getting this error, everytime I make an axios request

node_modules/express/lib/response.js:1150
    : JSON.stringify(value);
           ^
TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Object'
    |     property 'curlObject' -> object with constructor 'CurlHelper'
    --- property 'request' closes the circle
    at JSON.stringify (<anonymous>)

can anyone please tell me what's the issue here?

[jimmywarting]

I would say that you don't need this pkg anymore.

const formData = new FormData()

for (const file of files) {
  const blob = await fs.openAsBlob(file.path)
  formData.append('file[]', blob, `${file.type}_${file.month}.pdf`)
}

fetch(url, { method: 'POST', body: formData })

fetch, blob and formdata is built in globally now.

[glhrmv]

@jimmywarting I am getting Cannot find name 'FormData'. compilation error from TypeScript using Node 18.16.1, is there something I need to configure to let TypeScript aware of this global?

[jimmywarting]

if you are going to use fs.openAsBlob(path[, options]) then you will need v19.8+
maybe try to install latest @types/node

[glhrmv]

@jimmywarting Should have clarified that I am not using openAsBlob, the issue is strictly related to the first line const formData = new FormData(). And I have the latest @types/node. :(

[jimmywarting]

I am not using openAsBlob

Built in FormData is not going to accept a readableStream... if that is what you are using. saw you where using fs.createReadStream(file.path)

And I have the latest @types/node. :(

sry, can't help you there.