Node.js Amazon Polly to file example.

amazon-polly-file.js

// Load the SDK
const AWS = require('aws-sdk')
const Fs = require('fs')

// Create an Polly client
const Polly = new AWS.Polly({
    signatureVersion: 'v4',
    region: 'us-east-1'
})

let params = {
    'Text': 'Hi, my name is @anaptfox.',
    'OutputFormat': 'mp3',
    'VoiceId': 'Kimberly'
}

Polly.synthesizeSpeech(params, (err, data) => {
    if (err) {
        console.log(err.code)
    } else if (data) {
        if (data.AudioStream instanceof Buffer) {
            Fs.writeFile("./speech.mp3", data.AudioStream, function(err) {
                if (err) {
                    return console.log(err)
                }
                console.log("The file was saved!")
            })
        }
    }
})

The sound is very low, I tried to use <prosody volume = + 20dB> Hi, my name is @anaptfox., but it is not accepting the prosody

'Text': 'Hi, my name is @anaptfox.'

@jersonjunior: ssml tags will be accepted if setting 'TextType': 'ssml', in params. :)

how to get file in wav format?

I use this:
var output = child_process.execSync('lame --decode ' + argv.mp3 + ' ' + '-b 8000' + ' ' + argv.wav + '.wav');

To convert in wav 8000hz