multipart/form-data

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Posted on by Mattw112b

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I have a webhook from an external app. That is sending files that are submitted.

I have a flow

I have a trigger in the flow "When an HTTP Request is received"

The webhoook sends as "multipart/form-data" type

So cant generate a schema, just leave blank.

Can't parse json, since not json

I can try to do splits, replaces, etc.

But it is very messy and it seems like when you convert to string for the replaces, it changes the base64 content to something else? XML?

What is the best way to do this? Below is an example of what the webhook sends.. the content has been removed from the word document, there will always be 1 resume, 1 aadhar card, 1 pan card but could be multiple pay documents...:

{
"$content-type": "multipart/form-data; boundary=1924ec1e13c",
"$content": "<CONTENT BASE64>",
"$multipart": [
{
"headers": {
"Content-Disposition": "form-data; name=\"pancard\"; filename=\"resume.docx\"",
"Content-Type": "application/x-tika-ooxml",
"Content-Length": "14777"
},
"body": {
"$content-type": "application/x-tika-ooxml",
"$content": "<CONTENT BASE64>"
}
},
{
"headers": {
"Content-Disposition": "form-data; name=\"aadhardcard\"; filename=\"aadhar.txt\"",
"Content-Type": "text/plain",
"Content-Length": "6"
},
"body": "aadhar"
},
{
"headers": {
"Content-Disposition": "form-data; name=\"payslips\"; filename=\"pay2.txt\"",
"Content-Type": "text/plain",
"Content-Length": "3"
},
"body": "pay"
},
{
"headers": {
"Content-Disposition": "form-data; name=\"payslips\"; filename=\"pay.txt\"",
"Content-Type": "text/plain",
"Content-Length": "3"
},
"body": "pay"
}
]
}

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Suggested answer

MichaelFP 1,847 Super User 2025 Season 2 on at

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using the replace to remove "$" and after parse to JSON it will work. Because properties with "$" are internally handle by Power automate.

you can replace "$" from: $content-type, $multpart,$content, to avoid to remove from a text that has the symbol.

after that you be able to interact with the content.

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Mattw112b 1,088 on at

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So the weird part is, the output of the body of the "When HTTP request is received" trigger, doesn't look anything like the input to the compose directly after it?

So the "$" items above for example arent there.. it looks like this:

so can't really remove the "$" and there's no way really to convert this to json.

so then it gets messy trying to split, replace, etc. on this. When I try I have to convert to string, then have all these \r\n\r\n characters.. then the base64 gets converted to somethign else ?xml?

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MichaelFP 1,847 Super User 2025 Season 2 on at

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Apply the steps below to get each file from multi-part format.

First you need to get muiltpart content. for that you need to use the compose using the following expression

triggerBody()?['$multpart']

it will give to you the array of the files, so you will now using apply for each with the result of the compose

Now you will be able to loop over the files send. So now we will get the binary and the file name

Get the file

Inside the "Apply to each" use the compose action with the following expression:

item()?['body']

Get File Name

Inside the "Apply to each" use the compose action with the following expression:

replace(split(split(item()?['headers/Content-Disposition'], 'filename="')[1], '"')[0], '\"', '')

and now you can try to receive a new file.

in your flow you will see that you got the file binary and file name

Hope that helps you!

If my answer helped you, please give me a thumbs up (👍). If solve your question please mark as answer ✔️. This is help the community.

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