Object to String

obj.2.str.js

var obj2string = function( obj, prefix ) {
  var str = [];

  for ( var prop in obj ) {
    if ( obj.hasOwnProperty( prop ) ) {
      var k = prefix ? prefix + '[' + prop + ']' : prop, v = obj[prop];
      str.push( typeof v === 'object' ?
        obj2string( v, k ) :
        encodeURIComponent( k ) + '=' + encodeURIComponent( v ) );
    }
  }

  return str.join( '&' );
};