How to serialize an object to query string using jQuery ?

Last Updated : 10 Dec, 2019

Given a jQuery object and the task is to serialize the object element into the query string using JQuery.

Approach 1:

Declare an object and store it into the variable.
Use JSON.stringify() method to convert the object into strings and display the string contents.
Use param() method to serialize the object element as query string and store it into a variable.
Display the serialize object as query string.

Example: This example uses the param() method to serialize the object.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        JQuery | Serialize object to query string.
    </title>
    <style>
        #GFG_UP {
            font-size: 17px;
            font-weight: bold;
        }
          
        #GFG_UP2 {
            font-size: 20px;
            font-weight: bold;
            color: green;
        }
          
        #GFG_DOWN {
            color: green;
            font-size: 24px;
            font-weight: bold;
        }
          
        button {
            margin-top: 20px;
        }
    </style>
</head>
<script src=
     "https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
  
<body style="text-align:center;" id="body">
    <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1>
    <p id="GFG_UP">
    </p>
    <p id="GFG_UP2">
    </p>
    <button>
        click here
    </button>
    <p id="GFG_DOWN">
    </p>
    <script>
        $('#GFG_UP')
        .text('Click the button to serialize the object to query string');
        var data = {
            param1: 'val_1',
            param2: 'val_2',
            param3: 'val_3'
        };
        $('#GFG_UP2').text(JSON.stringify(data));
        $('button').on('click', function() {
            var result = $.param(data);
            $('#GFG_DOWN').text(result);
        });
    </script>
</body>
  
</html>

Output:

Before clicking the button:
After clicking the button:

Approach 2:

Declare an object and store it into the variable.
Use JSON.stringify() method to convert the object into strings and display the string contents.
Click on the button to call convert() function which convert the serialize object to query string.
The convert() function uses keys() and map() method to convert the serialize object to query string.

Example: This example creates a function which is taking each key, value pair and appending them as a string to get the query string keys() and map() method.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        JQuery | Serialize object to query string.
    </title>
    <style>
        #GFG_UP {
            font-size: 17px;
            font-weight: bold;
        }
          
        #GFG_UP2 {
            font-size: 20px;
            font-weight: bold;
            color: green;
        }
          
        #GFG_DOWN {
            color: green;
            font-size: 24px;
            font-weight: bold;
        }
          
        button {
            margin-top: 20px;
        }
    </style>
</head>
<script src=
    "https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
  
<body style="text-align:center;" id="body">
    <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1>
    <p id="GFG_UP">
    </p>
    <p id="GFG_UP2">
    </p>
    <button>
        click here
    </button>
    <p id="GFG_DOWN">
    </p>
    <script>
        $('#GFG_UP')
        .text('Click the button to serialize the object to query string');
        var data = {
            param1: 'val_1',
            param2: 'val_2',
            param3: 'val_3'
        };
        $('#GFG_UP2').text(JSON.stringify(data));
  
        function convert(json) {
            return '?' +
                Object.keys(json).map(function(key) {
                    return encodeURIComponent(key) + '=' +
                        encodeURIComponent(json[key]);
                }).join('&');
        }
        $('button').on('click', function() {
            var result = convert(data);
            $('#GFG_DOWN').text(result);
        });
    </script>
</body>
  
</html>

Output:

Before clicking the button:
After clicking the button:

My Personal Notes

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