Javascript JSON to Params Query String Generator

generate_params_query_string.js

window.generate_params_query_string = function(json){
  if(typeof json == 'string'){
    json = JSON.parse(json);
  }

  var params_str_array = [];

  var parse_plain_value = function(current_obj, current_prefix){
    var strParam = current_prefix + "=" + encodeURIComponent(current_obj);
    params_str_array.push(strParam);
  };

  var parse_array = function(current_obj, current_prefix){
    current_obj.forEach(function(val){
      if(Array.isArray(val)){
        parse_array(val, current_prefix);

      }else if(typeof val === 'object' && val !== null){
        parse_object(val, current_prefix);
      }else{

        parse_plain_value(val, current_prefix)
      }
    });
  };

  var parse_object = function(current_obj, current_prefix){
    Object.keys(current_obj).forEach(function(key, i){
      var val = current_obj[key];

      if(Array.isArray(val)){
        if(current_prefix){
          var prefix = current_prefix+"["+key+"][]";
        }else{
          var prefix = key+"[]";
        }

        parse_array(val, prefix);

      }else if(typeof val === 'object' && val !== null){
        if(current_prefix){
          var prefix = current_prefix+"["+key+"]";
        }else{
          var prefix = key;
        }

        parse_object(val, prefix);

      }else{
        if(current_prefix){
          var prefix = current_prefix+"["+key+"]";
        }else{
          var prefix = key;
        }

        parse_plain_value(val, prefix)
      }
    });
  };

  parse_object(json, null);

  var params_str = params_str_array.join("&")

  return params_str;
};

index.js

// Using JSON String
window.generate_params_query_string(json_str);

// Using an object or parsed JSON
window.generate_params_query_string(obj);