How to convert blob to wav file

function makeLink(){  let blob = new Blob(chunks, {type: media.type })    , Url = URL.createObjectURL(blob)    , li = document.createElement('li')    , mt = document.createElement(media.tag)    , hf = document.createElement('a');    mt.controls = true;  mt.src = Url;  hf.href = Url;  hf.download = `${counter++}${media.ext}`;  hf.innerHTML = `donwload ${hf.download}`;  let formData = new FormData();  formData.append(audio, blob, 'audio.wav');  let x='test'  $.ajax({    type:'GET',    url:'/answer/voice',    data: formData,    contentType: false,    processData: false,    success:function(result) {      $("#chatbox").append('<p class ="userText"><audio style="background-color:white;" controls> <source src="' + Url+ '" type="audio/wav"></audio></p>');      $("#chatbox").append('<p class ="botText"><span>' + result.emotion+ '</span></p>');      $("#textInput").val("")    },    error:function(result){      alert('sorry an error occured');    }  });}

@app.route('/answer/voice', methods=['POST'])    def answer_voice():    blob=request.files["audio"]    print(blob)    with open(blob, 'r') as f:         result=get_audio_sentiments(f.read())    return jsonify({'emotion':result  })

@Musa answer is right.I discovered this solution as well:

  var xhr=new XMLHttpRequest();                   var fd=new FormData();          fd.append("audio_data",blob, "output.wav");          xhr.open("POST","/answer/voice",true);          xhr.send(fd);  //processing data  // jQuery(document).ready(function(){    xhr.onreadystatechange = function() {    if (xhr.readyState === 4) {      resultats = this.responseText      var results=JSON.parse(resultats);      console.log(typeof results);      $("#chatbox").append('<p class ="userText"><audio style="background-color:white;" controls> <source src="' + Url+ '" type="audio/wav"></audio></p>');         let userHtml = '<p class="userText"><span>' +results.question + '</span></p>';      $("#chatbox").append(userHtml);            $("#chatbox").append('<p class ="botText"><span>'  +results.answerered+ ' '+ results.emotion+ '</span></p>');           $("#textInput").val("")    }     }

I used XMLHttpRequest and it solved my issue