二进制文件到base64 nodejs

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);
})