How can I create an equivalent code in JavaScript?

Given ['col1', 'col2'] and ['val1', 'val2'] OR 'col1,col2\r\nval1,val2\r\n'

I want to be able to create a csv object without reading/writing to disk and then POST it.

Python:

from io import StringIO
import csv
import requests

f = StringIO()
w = csv.writer(f)
w.writerow(['col1', 'col2'])
w.writerow(['val1', 'val2'])
input_byte = f.getvalue().encode('UTF-8')

headers = {'Content-Type':"multipart/form-data"}
endpoint = "http://localhost:8085/predict"
files = {'file': ('input.csv', input_byte)}
response = requests.post(endpoint, files=files)