//waitFor should be able to get you whether if a bucket does not exist.

​

var params = {

  Bucket: 'STRING_VALUE' /* required */

};

s3.waitFor('bucketNotExists', params, function(err, data) {

  if (err) console.log(err, err.stack); // an error occurred

  else     console.log(data);           // successful response

});

​

//If a bucket does not exist, then you can create it.

//Hope it helps.

var params = {

  Bucket: 'STRING_VALUE' /* required */

};

s3.waitFor('bucketNotExists', params, function(err, data) {

  if (err) console.log(err, err.stack); // an error occurred

  else     console.log(data);           // successful response

});