Sending audio data from JS to Python

You are passing an array of event objects to the Blob constructor not the audio data.
The data is e.data, so your code should be

mediaRecorder.ondataavailable = e => {    chunks.push(e.data);}

You can do it with the multipart file upload in javascript

export function uploadAudio(audioBlob) {    let data = new FormData();    data.append('file', audioBlob);    return axios        .post(`http://localhost:3030/audiorecog`, data, {            headers: {                'Content-Type': 'multipart/form-data',            },        })        .then(res => {            console.log(res)            return res        });}

In Python, you can receive the blob and save it

@app.route('/audiorecog', methods = ['GET', 'POST'])def audiorecog():   if request.method == 'POST':      print("Recieved Audio File")      file = request.files['file']      print('File from the POST request is: {}'.format(file))      with open("audio.wav", "wb") as aud:            aud_stream = file.read()            aud.write(video_stream)      return "Success"   return 'Call from get'

Have you tried using FormData?

var form = new FormData();form.append('file', BLOBDATA, FILENAME);$.ajax({  type: 'POST',  url: 'ServerURL',  data: form, // Our pretty new form  cache: false,  processData: false, // tell jQuery not to process the data  contentType: false // tell jQuery not to set contentType}).done(function(data) {  console.log(data);});

On the python end, you could check if the data's there by doing something like:

@app.route('/messages', methods=['POST'])def api_message():    app.logger.debug(request.files['file'].filename)