var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: "ACCESS_KEY",secretAccessKey: 'SECRET_KEY'});
var s3bucket = new AWS.S3({params: {Bucket: 'BUCKET_NAME'}});
function uploadFileOnS3(fileName, fileData){
    var params = {
      Key: fileName,
      Body: fileData,
    };
    s3bucket.upload(params, function (err, res) {               
        if(err)
            console.log("Error in uploading file on s3 due to "+ err)
        else    
            console.log("File successfully uploaded.")
    });
}