index.js

const puppeteer = require('puppeteer');
const axios = require('axios');
const fs = require('fs');

(async () => {
    const url = process.argv[2];
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto(url);
    const textToBeConverted = await page.evaluate(() => Array.from(document.querySelectorAll('p'), element => element.textContent));
    textToBeConverted.forEach(e => {
        // downloadSpeechFromFile("demo.wav", textToBeConverted)
    })
    downloadSpeechFromFile("demo.wav", JSON.stringify({"text": "Hello my name is Aviraj Khare. I am going to be 27 years old."}))
    await browser.close();
})();

function downloadSpeechFromFile(fileName, textToBeConverted) {
    const response = axios({
        url: "https://api.us-south.text-to-speech.watson.cloud.ibm.com/instances/{some_uuid}/v1/synthesize",
        method: 'post',
        responseType: 'stream',
        auth: {
            username: "apikey",
            password: "{password}"
        },
        headers: {
            "Content-Type": "application/json",
            "Accept": "audio/wav"
        },
        params: {
            "voice": "en-US_MichaelV3Voice"
        },
        data: {
            "text": "Hello my name is Aviraj Khare. I am from India."
        }
    }).then(function (response) {
        response.data.pipe(fs.createWriteStream(fileName));
      })
      .catch(function (err) {
        console.error(err);
      });
};