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AJAX - How To Retrieve JSON Response from PHP script

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Hello Friends, This is my first tutorial post.

Today I'll explain you how to retrieve JSON response via Ajax call.

First we build a PHP script to send response in JSON format, then we will gather this response from an Ajax call through jQuery script.

Let’s first create a PHP script 

Create a PHP script, I’ll name it as “json_response.php”
And add following code in it

json_response.php

<?php

 //set header for JSON response
header("Content-Type: application/json");

 //render array in JSON format
echo json_encode(array('status' => 200, 'message' => 'Response from PHP script in JSON format.'));

This is a basic example to send JSON response.
PHP script will send response with status code and message.

Now create a HTML file to fetch JSON response and add it in header tag.

Create a HTML file, I’ll name it as “json_response.html”
And add following code.

 json_response.html

<html>                                                                                                            
    <head> 
                                                                                                                           <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>                  
        <script type="text/javascript">                                                                                
            $('document').ready(function() {                                                                          
      //create ajax call to fetch json response                                                            
                $.ajax({                                                                                                                          url: 'json_header.php',                                                                                
                    type: 'GET',                                                                                               
                    dataType: 'JSON', // it is necessary to get JSON response                                                                                                         
                    success: function(response) {                                                                      
                       // if reponse status is success                                                                  
                        if (response.status == 200) {                                                            
       // add message to header tag                                                    
                            $('#message').html(response.message);                                    
                        }                                                                                             
                    }                                                                                                 
                });                                                                                                   
            });                                                                                                       
        </script>                                                                                                   
    </head>                                                                                                        
    <body>                                                                                                         
        <h1 id="message"></h1>                                                                             
    </body>                                                                                                         
</html>  
                                                                                                       
Note: It is very important to add ajax request parameter  dataType: 'JSON' to fetch response in JSON format.

After running HTML file in browser you see the header tag has message as

“Response from PHP script in JSON format.”


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