How to serialize an object into a list of URL query parameters using JavaScript ?

Given a JavaScript Object and the task is to serialize it into a URL query parameters using JavaScript.

Approach 1:

  • Declare an object and store it into the variable.
  • Then use JSON.stringify() method to convert javascript object into string and display the content.
  • Next, take an empty string and append (key, value) pairs of object to it by accessing the every property of object.

Example: This example serialize an object into a list of URL query parameters using JavaScript.

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<!DOCTYPE HTML> 
<html> 
    <head> 
        <title> 
            Serialize an Object into a list of URL
            query parameters in JavaScript
        </title>
    </head> 
      
    <body style = "text-align:center;"> 
          
        <h1 style = "color:green;" > 
            GeeksForGeeks
        </h1>
          
        <p id = "GFG_UP" style =
            "font-size: 19px; font-weight: bold;">
        </p>
          
        <button onclick = "GFG_Fun()">
            click here
        </button>
          
        <p id = "GFG_DOWN" style =
            "color: green; font-size: 24px; font-weight: bold;">
        </p>
          
        <!-- Script to Serialize an Object into a list
        of URL query parameters -->
        <script>
            var el_up = document.getElementById("GFG_UP");
            var el_down = document.getElementById("GFG_DOWN");
              
            // Declare an object
            var obj = {
                p1: 'GFG',
                p2: 'Geeks',
                p3: 'GeeksForGeeks'
            }
              
            // Use JSON.stringify() function to
            // convert object into string
            el_up.innerHTML = JSON.stringify(obj);
              
            // Function to Serialize an Object into a
            // list of URL query parameters
            function GFG_Fun() {
                var s = "";
                for (var key in obj) {
                    if (s != "") {
                        s += "&";
                    }
                    s += (key + "=" + encodeURIComponent(obj[key]));
                }
                el_down.innerHTML = "'" + s + "'";
            }
        </script> 
    </body> 
</html>                    

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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    


    • 



Approach 2:




    

  • Declare an object and store it into the variable.
    • 

  • Then use JSON.stringify() method to convert javascript object into string and display the content.
    • 

  • Use map() method to append the object key value pair and use join() method to join all object element.
    • 



Example: This example uses the map() method and appends each key, value pair to string.











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<!DOCTYPE HTML>  


<html>  


    <head>  


        <title>  


            Serialize an Object into a list of URL 


            query parameters in JavaScript 


        </title> 


    </head>  


      


    <body style = "text-align:center;">  


          


        <h1 style = "color:green;" >  


            GeeksForGeeks 


        </h1> 


          


        <p id = "GFG_UP" style = 


            "font-size: 19px; font-weight: bold;"> 


        </p> 


          


        <button onclick = "GFG_Fun()"> 


            click here 


        </button> 


          


        <p id = "GFG_DOWN" style = 


            "color: green; font-size: 24px; font-weight: bold;"> 


        </p> 


          


        <!-- Script to Serialize an Object into a list 


        of URL query parameters -->


        <script> 


            var el_up = document.getElementById("GFG_UP"); 


            var el_down = document.getElementById("GFG_DOWN"); 


              


            // Declare an object 


            var obj = { 


                p1: 'GFG', 


                p2: 'Geeks', 


                p3: 'GeeksForGeeks' 


            } 


              


            // Use JSON.stringify() function to 


            // convert object into string 


            el_up.innerHTML = JSON.stringify(obj); 


              


            // Function to Serialize an Object into a 


            // list of URL query parameters 


            function GFG_Fun() { 


                var s = Object.keys(obj).map(function(key) { 


                    return key + '=' + obj[key]; 


                }).join('&'); 


                  


                el_down.innerHTML = "'" + s + "'"; 


            } 


        </script>  


    </body>  


</html>                     



















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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    


    • 



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