How to Decode JSON Data from Ajax in PHP?

Decoding JSON Data from Ajax in PHP

When attempting to send JSON data from an Ajax request to a PHP script, you may encounter an issue where the data is not properly received or parsed. To resolve this, a common question is how to effectively send JSON data from Ajax and decode it in PHP.

Solution

1. Remove Content-Type Header

In the Ajax request, remove the contentType header:

$.ajax({
    type: "POST",
    dataType: "json",
    url: "add_cart.php",
    data: {myData:dataString}
});

2. Use Direct Variable Assignment

In PHP, access the JSON data directly from $_POST without using json_decode:

if(isset($_POST['myData'])){
    $obj = $_POST['myData'];
    //some php operation
}

Reason

The reason the original code was not working is because the contentType header was set to application/json. This indicated to PHP that the data being sent was in JSON format, which is not the case. The data is actually a normal POST query that contains a JSON string.

By removing the contentType header, you are sending the data as a regular POST query and allowing PHP to handle the string conversion automatically.

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