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Editorial Team
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Asked: 2026-06-11T18:11:28+00:00

I am trying to save json data to a file using AJAX and PHP

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I am trying to save json data to a file using AJAX and PHP but the resulting file is empty. Why is it not working?

Here is the HTML:

<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<script>

var dataset = {"value1": 2, "value2": 1000};

$.ajax({
   url: 'save.php',
   type: 'POST',
   data: dataset,
   success: function() {
      alert('Success');
   }
});

</script>
</body>
</html>

save.php:

<?php 
$map=json_decode($_POST['json_string']);
$file = "test.json"; 
$fh = fopen($file, 'w') or die("can't open file");
fwrite($fh, $map);
fclose($fh);
?>
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1 Answer

  1. Editorial Team

    You’re using wrong POST variable name. Firstly, send your AJAX request with:

    data: { 
    json: dataset
    },

    And then use:

    $map = $_POST['json'];

    Don’t decode it since you want to save JSON string, not an array. If you want PHP representation, better use var_export():

    $map = var_export(json_decode($_POST['json'], true), true);
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