Parse multipart file using formidable

[krusk]

Hi all,

I am receiving a multipart file via a REST service call to a vendors API. This file includes XML data and blob data for two images. I need to be able to split and store these as individual files using Node/Express. I have seen a lot posts/resources on multipart form data, but my needs are parsing this using JavaScript into individual files that can then be uploaded into Azure Blob Storage. I suspect Node/Express or a Node module such as request (https://github.com/request/request) would be the right way to go, but haven't found anything concrete. Here is an example of the multipart file. Note that there is not filename for the multipart file:

MIME-Version:1.0
Content-Type:multipart/mixed; 
boundary="----=_Part_4_153315749.1440434094461"

------=_Part_4_153315749.1440434094461
Content-Type: application/octet-stream; name=Texture_1.png
Content-ID: response-1
Content-Disposition: attachment; filename=Texture_1.png

‰PNG
"blob data here"

------=_Part_4_153315749.1440434094461
Content-Type: application/octet-stream; name=manifest.xml
Content-ID: response-2
Content-Disposition: attachment; filename=manifest.xml

<?xml version="1.0"?>
<dae_root>blank_3D.dae</dae_root>

------=_Part_4_153315749.1440434094461
Content-Type: application/octet-stream; name=texture_3D.dae
Content-ID: response-3
Content-Disposition: attachment; filename=texture_3D.dae

<xml data here... lots of xml data>

------=_Part_4_153315749.1440434094461
Content-Type: application/octet-stream; name=Texture_0.png
Content-ID: response-4
Content-Disposition: attachment; filename=Texture_0.png

‰PNG
"blob image data"

Is this something that Formidable can manage, and if so, how?

Thanks,

K.

[lithiumlab]

I'm behind exactly the same use case i still can't find the answer clearly. Have you made some progress on this?

I want to able to parse multipart/related response from xhr in the front-end to inmmediately play an audio file and show some metadata that comes in json from the API.

It looks like formidable can deal with it, but theres a lot of code for file handling, storing, and connecting / integrating the with node servers that generates errors when trying to use it clientside in a browser.

[GrosSacASac]

Check this example https://github.com/node-formidable/node-formidable/blob/master/example/multipartParser.js. it shows how to use the multipart parser as standalone

[Prinzhorn]

The example is now at https://github.com/node-formidable/formidable/blob/master/examples/multipart-parser.js

But how do I adapt the code to use it with formidable that I've installed?

Replacing the require with const { MultipartParser } = require('formidable/lib/multipart_parser.js'); results in

multipartParser.on('data', ({ name, buffer, start, end }) => {
                ^

TypeError: multipartParser.on is not a functio

And it looks like index.js only exports IncomingForm. So how do I use the parser standalone?

[GrosSacASac]

const { MultipartParser } = require('formidable');

[GrosSacASac]

or const MultipartParser = require('formidable/src/parsers/Multipart.js');

[GrosSacASac]

lib does not exist

[Prinzhorn]

lib does not exist

I assume it must be created during the publish process

docker run --rm -it node:14 /bin/bash
npm i formidable
cd node_modules/formidable/
ls
# LICENSE  README.md  benchmark-2020-01-29_xeon-x3440.png  lib  package.json
ls lib/
# file.js  incoming_form.js  index.js  json_parser.js  multipart_parser.js  octet_parser.js  querystring_parser.js

[GrosSacASac]

install from master branch npm i github:node-formidable/formidable

[Prinzhorn]

@GrosSacASac I understand that this is possible and I can also do npm install formidable@canary but I'm under the impression that "canary" means not production?

Edit: But I understand now, the example code is meant to be used with the latest release and I probably have to adjust it for the stable release. Thanks!