convert mp3 file to wav in node js using ffmpeg

var ffmpeg = require('fluent-ffmpeg');
var track = './test.mp3';//your path to source file

console.log("outside");

ffmpeg(track)
.format('wav')
.on('error', function (err) {
    console.log('An error occurred: ' + err.message);
})
.on('progress', function (progress) {
    // console.log(JSON.stringify(progress));
    console.log('Processing: ' + progress.targetSize + ' KB converted');
})
.on('end', function () {
    console.log('Processing finished !');
}).output("./test.wav")
.run();