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NodeJS: Detect if an Object is empty or not

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Using ExpressJS, I wanted a simple function that would respond (through JSON) whether a request query was present or not.

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  1. exports.test = function(req, res){
  2.     var params = req.query;
  3.     if( !isEmpty(params) ) res.json( params );
  4.     else res.json( { message: "no request query" } )
  5. };
  6.  
  7. //http://stackoverflow.com/questions/4994201/is-object-empty
  8. function isEmpty(obj) {
  9.     // null and undefined are "empty"
  10.     if (obj == null) return true;
  11.  
  12.     // Assume if it has a length property with a non-zero value
  13.     // that that property is correct.
  14.     if (obj.length && obj.length > 0)    return false;
  15.     if (obj.length === 0)  return true;
  16.  
  17.     // Otherwise, does it have any properties of its own?
  18.     // Note that this doesn't handle
  19.     // toString and toValue enumeration bugs in IE < 9
  20.     for (var key in obj) {
  21.         if (hasOwnProperty.call(obj, key)) return false;
  22.     }
  23.  
  24.     return true;
  25. }

URL: http://stackoverflow.com/questions/4994201/is-object-empty

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