Webhook format problem sending json string and binary buffer

[jmorris644]

I am having trouble figuring out to exactly format a webhook (http request). I need to send a json string as well as a binary buffer. I have spent over a day trying different configurations and googling for solutions. I just cannot put the pieces together. I did seen an example where someone put the buffer under the "req" tag. But when I try that it seems as if the http request node only sends the payload.

[jmorris644]

Here is the code that I would like to work. or something similar. msg.data contains some JSON about the image.

msg.payload = msg.data;
msg.payload.image = Buffer.from(msg.image);
return msg;```

[jmorris644]

I have discovered the node-red-contrib-send-multipart-formdata node. It works great but it only takes static data. I am modifying it to take variable data. Once I am finished with that I will have my solution.

[knolleary]

The core http request node can do formdata - no need to use a contrib node, especially one you have to modify the source of first.

The sidebar help for the request node has details under the 'file upload' section.

[jmorris644]

Thanks! This will teach me to scroll to the bottom of instructions.

The sidebar is not explicit enough for me to glean how to do buffers. But I am not googling it.

[jmorris644]

I wanted to add a final note to this thread. It took me quite a while to figure it out. In my searching I got confused by the results as many are before the http request node became multipart aware. I thought I would post my final version of creating the multipart payload that finally worked for me. As a note, msg.image is a buffer array and msg.data is JSON.

msg.headers = {
    "Content-Type": "multipart/form-data"
}

msg.payload = {
    "file": {
        "value": msg.image,
        "options": {
        "Content-Type" : "application/octet-stream",
        "filename": "test"
        }
        },
    "data": {
        "value": JSON.stringify(msg.data)
    }
}