<!DOCTYPE html>
<html lang="en">
 
<head>
   
<meta charset="utf-8" />
   
<meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      rel="icon"
      href="data:image/svg+xml,
<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎙️</text></svg>"
    />
   
<title>How to record audio from the user's microphone</title>
 
</head>
 
<body>
   
<h1>How to record audio from the user's microphone</h1>
   
<button id="startMicrophoneButton">Start using microphone</button>
   
<button id="stopMicrophoneButton" disabled>Stop using microphone</button>
   
<button id="startRecordButton" disabled>Start recording</button>
   
<button id="stopRecordButton" disabled>Stop recording</button>
   
<pre id="logs"></pre>
 
</body>
</html>

       
:root {
 
color-scheme: dark light;
}
html
{
 
box-sizing: border-box;
}
*,
*:before,
*:after {
 
box-sizing: inherit;
}
body
{
 
margin: 1rem;
 
font-family: system-ui, sans-serif;
}
button
{
 
display: block;
 
margin-bottom: 4px;
}
pre
{
 
color: red;
 
white-space: pre-line;
}
       

       
const startMicrophoneButton = document.querySelector('#startMicrophoneButton');
const stopMicrophoneButton = document.querySelector('#stopMicrophoneButton');
const startRecordButton = document.querySelector('#startRecordButton');
const stopRecordButton = document.querySelector('#stopRecordButton');

let stream
;
let recorder
;

startMicrophoneButton
.addEventListener("click", async () => {
 
// Prompt the user to use their microphone.
  stream
= await navigator.mediaDevices.getUserMedia({ audio: true });
  recorder
= new MediaRecorder(stream);

  stopMicrophoneButton
.disabled = false;
  startRecordButton
.disabled = false;
  log
("Your microphone audio is being used.");
});

stopMicrophoneButton
.addEventListener("click", () => {
 
// Stop the stream.
  stream
.getTracks().forEach(track => track.stop());

  startRecordButton
.disabled = true;
  stopRecordButton
.disabled = true;
  log
("Your microphone audio is not used anymore.");
});

startRecordButton
.addEventListener("click", async () => {
 
// For the sake of more legible code, this sample only uses the
 
// `showSaveFilePicker()` method. In production, you need to
 
// cater for browsers that don't support this method, as
 
// outlined in https://web.dev/patterns/files/save-a-file/.

 
// Prompt the user to choose where to save the recording file.
 
const suggestedName = "microphone-recording.webm";
 
const handle = await window.showSaveFilePicker({ suggestedName });
 
const writable = await handle.createWritable();

 
// Start recording.
  recorder
.start();
  recorder
.addEventListener("dataavailable", async (event) => {
   
// Write chunks to the file.
    await writable
.write(event.data);
   
if (recorder.state === "inactive") {
     
// Close the file when the recording stops.
      await writable
.close();
   
}
 
});

  stopRecordButton
.disabled = false;
  log
("Your microphone audio is being recorded locally.");
});

stopRecordButton
.addEventListener("click", () => {
 
// Stop the recording.
  recorder
.stop();

  stopRecordButton
.disabled = true;
  log
("Your microphone audio has been successfully recorded locally.");
});