How do I parse a request body with content type: multipart/mixed in express?

A simple example of such request is below:

curl -H "Content-Type: multipart/mixed" -F "[email protected];type=application/json" -F "[email protected]" -X POST https://mysimpleapi.com

Body.json file is a simple json

[{
    "name": "Test",
    "age": "23"
},
{
    "name": "Best", 
    "age": "24"
}]

and test.xml is just a regular file.

The curl request above looks like this:

{
  "method": "POST",
  "path": "/",
  "query": {},
  "headers": {
    "x-forwarded-for": "163.47.149.248",
    "x-forwarded-proto": "https",
    "x-forwarded-port": "443",
    "host": "mysimpleapi.com",
    "x-amzn-trace-id": "Root=1-618e4f8e-2cc109560ddfb65a7b5822ef",
    "content-length": "428",
    "user-agent": "curl/7.68.0",
    "accept": "*/*",
    "content-type": "multipart/mixed; boundary=------------------------e2d73e2082b30c29"
  },
  "bodyRaw": "--------------------------e2d73e2082b30c29\r\nContent-Disposition: attachment; name=\"request\"; filename=\"body.json\"\r\nContent-Type: application/json\r\n\r\n[{\n    \"name\": \"Test\",\n    \"age\": \"23\"\n},\n{\n    \"name\": \"Best\", \n    \"age\": \"24\"\n}]\n\r\n--------------------------e2d73e2082b30c29\r\nContent-Disposition: attachment; name=\"file1\"; filename=\"test.xml\"\r\nContent-Type: application/xml\r\n\r\n\r\n--------------------------e2d73e2082b30c29--\r\n",
  "body": "--------------------------e2d73e2082b30c29\r\nContent-Disposition: attachment; name=\"request\"; filename=\"body.json\"\r\nContent-Type: application/json\r\n\r\n[{\n    \"name\": \"Test\",\n    \"age\": \"23\"\n},\n{\n    \"name\": \"Best\", \n    \"age\": \"24\"\n}]\n\r\n--------------------------e2d73e2082b30c29\r\nContent-Disposition: attachment; name=\"file1\"; filename=\"test.xml\"\r\nContent-Type: application/xml\r\n\r\n\r\n--------------------------e2d73e2082b30c29--\r\n"
}

I want to get hold of the json object that's in the body of this request.

I was not able to find any documentation on how to parse this type of request. I know how to parse JSON and urlencoded form data from the request, but how do I parse a request like this on express? Is there any package that can do this parsing for me so that the request.body is not an empty object? Or I have to write some kind of parser myself(how do I do this?)?

CodePudding user response：

Answer this myself, dicer for node js can be used to do exactly this. The getting started example on dicer's npm worked just fine for the above example. https://www.npmjs.com/package/dicer