Post Request: File Upload to Flowise

Describe the problem/error/question

I can’t figure out how to send the correct POST request to upload an audio file to a Flowise flow.

I am following the Javascript Example given in the Flowise API Docs:

async function query(data) {
    const response = await fetch(
        "http://localhost:3000/api/v1/prediction/<chatlfowid>",
        {
            method: "POST",
            headers: {
                "Content-Type": "application/json"
            },
            body: JSON.stringify(data)
        }
    );
    const result = await response.json();
    return result;
}

query({
    "uploads": [
        {
            "data": 'data:audio/webm;codecs=opus;base64,GkXf', //base64 string
            "type": 'audio',
            "name": 'audio.wav',
            "mime": 'audio/webm'
        }
    ]
}).then((response) => {
    console.log(response);
});

The error message?

I am receiving the following error as a response from Flowise:

Error: predictionsServices.buildChatflow - Cannot read properties of undefined (reading ‘split’)

My Workflow

For practical reasons I have substituted an “Execution Data Node” in place of the HTTP Get request that downloads an ogg file. I pasted the exact output of the node in the former.

Share the output returned by the last node

The console log of the output is as follows:

{
“headers”: {
“content-type”: “application/json”,
“accept”: “application/json,text/html,application/xhtml+xml,application/xml,text/;q=0.9, image/;q=0.8, /;q=0.7”
},
“method”: “POST”,
“uri”: "https://myflowise.webhook.com/api/v1/prediction/asdad2da-8e5b-4785-a3a8-9034aac3a14b”,
“gzip”: true,
“rejectUnauthorized”: true,
“followRedirect”: true,
“resolveWithFullResponse”: true,
“followAllRedirects”: true,
“timeout”: 300000,
“body”: {
“uploads”: [
{
“data”: “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”,
“type”: “audio”,
“name”: “39561be1a102a7f0107fcdc6d0a0833a.ogg”,
“mime”: “audio/ogg”
}
]
},
“encoding”: null,
“json”: false,
“useStream”: true
}

Information on your n8n setup

  • n8n version: 1.55.3
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker):
  • Operating system: Ubuntu

Your console output shows that n8n is producing the output that you wanted, so it’s not an n8n error. The best would be to try to get the Flowise POST to function in just JS first. One immediate thing that pops out is that your ‘data’ field is just the base64 code and isn’t prefixed by data:audio/webm;codecs=opus;base64,[CODE HERE]

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