Upload audio data from React Native

audioFormData.js

async function uploadAudioAsync(uri) {
  console.log("Uploading " + uri);
  let apiUrl = 'http://YOUR_SERVER_HERE/upload';
  let uriParts = uri.split('.');
  let fileType = uriParts[uriParts.length - 1];

  let formData = new FormData();
  formData.append('file', {
    uri,
    name: `recording.${fileType}`,
    type: `audio/x-${fileType}`,
  });

  let options = {
    method: 'POST',
    body: formData,
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'multipart/form-data',
    },
  };

  console.log("POSTing " + uri + " to " + apiUrl);
  return fetch(apiUrl, options);
}

// Do a recording
let uri = await this.recording.getURI();
await uploadAudioAsync(uri);

@EvanBacon my m4a audio file is uploading but it's empty! Do you have any idea why?

i wanted to access the data of .amr file and then convert it into base 64

Good thanks you