Convert multipart/form-data cURL to Fetch node js - node.js

Question

With the following cURL request I am able to successfully interact with a pulsar api to update the configurations of a function.
Working cURL Request
curl --request PUT -H "Content-Type: multipart/form-data" -F functionConfig='{"parallelism":2};type=application/json' http://pulsar-test:8080/admin/v3/functions/test/ingest/test-entity-FeedTransformer
But I'm having trouble converting to an equivalent fetch request in Node.
Note: I'm using formdata-node to import FormData.
import { FormData } from 'formdata-node'
Non Working Fetch (Bad Request)
const body = new FormData()
body.append('functionConfig', '{"parallelism":2};type=application/json')
return fetch(
'http://pulsar-test:8080/admin/v3/functions/test/ingest/test-entity-FeedTransformer',
{
body,
headers: {
Authorization: 'Bearer abcd'
},
method: 'PUT'
}
)
Apparently the form data is not being set in a way the api server can recognize.
{"reason":"Function config is not provided"}
What am I missing here?

Answer 1

the problem is most likely that multipart request is not recognized/not well formed, or something like that, so try using another library, here's an example with Form-Data:
import { FormData } from 'form-data';
const body = new FormData();
body.append('functionConfig', '{"parallelism":2};type=application/json')
return fetch(
'http://pulsar-test:8080/admin/v3/functions/test/ingest/test-entity-FeedTransformer', {
body,
headers: {
Authorization: 'Bearer abcd'
},
method: 'PUT'
}
)
alternatively, you could run your curl command with child-process
see: How to use curl with exec nodejs