Why is specifying `contentType: \'application/json; charset=utf-8\'` unnecessary when sending JSON data to PHP using Ajax?

Sending JSON Data to PHP Using Ajax

In an effort to transfer JSON-formatted data to PHP for processing, developers may encounter obstacles. One such challenge involves transmitting JSON data via Ajax to a PHP script.

Troubleshooting Failed Ajax JSON Transmission

To resolve this issue, review the following code snippet:

<code class="javascript">$.ajax({
  type: "POST",
  dataType: "json",
  url: "add_cart.php",
  data: {myData: dataString},
  // Remove this line:
  contentType: "application/json; charset=utf-8",
  success: function(data) {
    alert('Items added');
  },
  error: function(e) {
    console.log(e.message);
  }
});</code>

The removal of the line contentType: "application/json; charset=utf-8" is crucial. When sending JSON data to PHP using Ajax, it is unnecessary to specify the content type as JSON. Instead, PHP will automatically parse the transmitted data as a JSON string.

Simplified Approach

To simplify the process further, eliminate the use of JSON.stringify and json_decode. Simply pass the data object directly to the Ajax request:

<code class="javascript">data: {myData: postData},</code>

In PHP, access the JSON data via $obj = $_POST['myData'];.

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