How to extract/parse data from a multipart/form-data request in Node-RED?

Question

I have an HTTP-in node that receives a request containing the following payload:

------WebKitFormBoundaryk5AazdSJAKEDRWS9
Content-Disposition: form-data; name="file"; filename="Sample1.csv"
Content-Type: application/vnd.ms-excel

< ... csv data here ... >

------WebKitFormBoundaryk5AazdSJAKEDRWS9
Content-Disposition: form-data; name="data"; filename="Sample1.json"
Content-Type: application/json

< ... json data here ... >

------WebKitFormBoundaryk5AazdSJAKEDRWS9--

How do I extract/parse the data or file content?

Sadly, I am unable to add libraries like formidable to Node-RED due to lack of access rights.

---

Update:
It seems to be possible to manually create a multipart/form-data in a function node. So, I ended up using sir @hardillb's answer and recreated the multipart/form-data request in the flow.

Reference: How to create multipart HTTP request in Node-RED

Answer 1

You shouldn't need to to use anything else. Just make sure the "Accept File uploads" box is ticked and the files should be available under msg.req.files

With the following structure:

[
  {
    fieldname: "file",
    originalName: "Sample1.csv",
    encoding: "7bit",
    mimeType: "application/vnd.ms-excel",
    buffer: [...],
    size: 2345
  },
  {
    fieldname: "data",
    originalName: "Sample1.json",
    encoding: "7bit",
    ...
  }
]

The msg.req.files[0].buffer contains the content of the first file.