Binary file to base64 nodejs - node.js

Question

I'm getting a binary audio file when I call the api tts.speech.microsoft.com and I would like to transform this binary into a base64 string.
I've been trying a lot of things, for example:
Buffer.from(body, "binary").toString("base64");
does not work.
I'm not sure 'binary' is the exact word, but it's not a readable format.
Thank you for your help.

Answer 1

I guess you were following the section Make a request and save the response of the offical document Quickstart: Convert text-to-speech using Node.js to write your code, as below.
var request = require('request');
let options = {
method: 'POST',
baseUrl: 'https://westus.tts.speech.microsoft.com/',
url: 'cognitiveservices/v1',
headers: {
'Authorization': 'Bearer ' + accessToken,
'cache-control': 'no-cache',
'User-Agent': 'YOUR_RESOURCE_NAME',
'X-Microsoft-OutputFormat': 'riff-24khz-16bit-mono-pcm',
'Content-Type': 'application/ssml+xml'
},
body: body
};
function convertText(error, response, body){
if (!error && response.statusCode == 200) {
console.log("Converting text-to-speech. Please hold...\n")
}
else {
throw new Error(error);
}
console.log("Your file is ready.\n")
}
// Pipe the response to file.
request(options, convertText).pipe(fs.createWriteStream('sample.wav'));
So I change the offical code above to create a function encodeWithBase64 to encode body with Base64.
function encodeWithBase64(error, response, body){
if (!error && response.statusCode == 200) {
var strBase64 = Buffer.from(body).toString('base64');
console.log(strBase64);
}
else {
throw new Error(error);
}
console.log("Your file is encoded with Base64.\n")
}
// Pipe the response to file.
request(options, convertText);
Or you can use the npm packages base64-stream and get-stream to get the string with Base64 from body.
var base64 = require('base64-stream');
const getStream = require('get-stream');
(async () => {
var encoder = new base64.Base64Encode();
var b64s = request(options).pipe(encoder);
var strBase64 = await getStream(b64s);
console.log(strBase64);
})();
Otherwise, stream-string also can do it.
var base64 = require('base64-stream');
const ss = require('stream-string');
var encoder = new base64.Base64Encode();
var b64s = request(options).pipe(encoder);
ss(b64s).then(data => {
console.log(data);
})