index.js

const speech = require("@google-cloud/speech");
const fs = require("fs");

async function main() {
  const client = new speech.SpeechClient();
  const filename = "./resources/audio.raw";
  const file = fs.readFileSync(filename);
  const audioBytes = file.toString("base64");
  const audio = {
    content: audioBytes
  };
  const config = {
    encoding: "LINEAR16",
    sampleRateHertz: 16000,
    languageCode: "en-US"
  };
  const request = {
    audio: audio,
    config: config
  };
  const [response] = await client.recognize(request);
  const transcription = response.results
    .map(result => result.alternatives[0].transcript)
    .join("/n");
  console.log(transcription);
}
main().catch(console.error);