How to upload recording file from Expo-av via Axios? - react-native

Question

I am trying to upload a file recorded using expo-av via an Axios post request to my server. Forgive me, I am a Python backend dev so I am not that familiar with JS or Axios. I have tried various solutions but can't get anything working.
The code I am using for the recording is this, mostly straight from the Expo docs (the recording element) and it is working fine (the audio file gets created by the simulator, e.g. a .caf file for iOS simulator)
import * as React from 'react';
import { Text, View, StyleSheet, Button } from 'react-native';
import { Audio } from 'expo-av';
export default function App() {
const [recording, setRecording] = React.useState();
async function startRecording() {
try {
console.log('Requesting permissions..');
await Audio.requestPermissionsAsync();
await Audio.setAudioModeAsync({
allowsRecordingIOS: true,
playsInSilentModeIOS: true,
});
console.log('Starting recording..');
const { recording } = await Audio.Recording.createAsync(
Audio.RECORDING_OPTIONS_PRESET_HIGH_QUALITY
);
setRecording(recording);
console.log('Recording started');
} catch (err) {
console.error('Failed to start recording', err);
}
}
async function stopRecording() {
console.log('Stopping recording..');
setRecording(undefined);
await recording.stopAndUnloadAsync();
const uri = recording.getURI();
console.log('Recording stopped and stored at', uri);
//My code for the upload
const formData = new FormData();
formData.append("attribute_x", "123");
formData.append("attribute_y", "456");
let soundFile = //NOT SURE WHAT THE ACTUAL SOUND FILE IS. The uri is just a string
formData.append("recording", {uri: uri, name: 'soundfile.caf', type: 'audio/x-caf'});
const response = await axios.post(my_url, formData, {
headers: {
'Content-Type': 'multipart/form-data',
'X-CSRFToken': 'csrftoken',
}
})
... deal with the response...
}
return (
<View style={styles.container}>
<Button
title={recording ? 'Stop Recording' : 'Start Recording'}
onPress={recording ? stopRecording : startRecording}
/>
</View>
);
}
The request body I need to send should be:
{
"attribute_x": 333,
"attribute_y": 291,
"recording": THE SOUND FILE
}
It's .caf for iOS and will be .mp4 for Android (defaults) but I can figure out how to deal with that myself. Just really pulling my hair out now with the upload/post request.
Thanks in advance.

Answer 1

I was unable to get it work with react-native, main cause is that multipart/form-data header wasn't set correctly and formdata.getHeaders() isn't defined in react-native.
Tried all that was tested here, but without success: https://github.com/axios/axios/issues/318
Solution: use https://github.com/sindresorhus/ky
const uri = recording.getURI();
const filetype = uri.split(".").pop();
const filename = uri.split("/").pop();
const fd = new FormData();
fd.append("audio-record", {
uri,
type: `audio/${filetype}`,
name: filename,
});
await ky.post("audio/upload", {
body: fd,
});
the headers will set automatically like with fetch api, and the boudary part will be provided !