json parse error with double quotes

Question

A double quote even if escaped is throwing parse error.
look at the code below

//parse the json in javascript  
var testJson = \'{\"result\": [\"lunch\",         


        

Answer 1

Turn off magic_quotes_gpc in php.ini.

Answer 2

If the standard C escapes are added, then JSON.parse will convert sequences like \" into ", \\ into \, \n into a line-feed, etc.

'foo\\bar\nbaz"' === JSON.parse('"foo\\\\bar\\nbaz\\""')

In our project's case:

original string ""{\"lat\":28.4594965,\"lng\":77.0266383}""

After passing to JSON.parse()

"{"lat":28.4594965,"lng":77.0266383}"

On 2^nd pass to JSON.parse()

{lat: 28.4594965, lng: 77.0266383}

Notice that JSON.parse() removed escaping characters instead of converting string to object.

After the escaping characters were removed, the string to object conversion worked.

Here is the demo:

while (typeof p1 != 'object') {
  p1 = JSON.parse(p1);
  pass++;
  console.log('On pass ', pass, p1);
}

Answer 3

Try This. and then try commented

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<pre><?php ($_POST)?print_r($_POST):'' ?></pre>

<form method="POST">
    <input type="text" name="name"><br>
    <input type="email" name="email"><br>
    <input type="time" name="time"><br>
    <input type="date" name="date"><br>
    <input type="hidden" name="id"><br>
    <textarea name="detail"></textarea>
    <input type="submit" value="Submit"><br>
</form>
<?php 
/* data */
$data = [
            'name'=>'vinay"'."'\\\\",
            'email'=>'imvsrajput@demo.demo',
            'time'=>date('H:i:00'),
            'date'=>date('Y-m-d'),
            'detail'=>'Try this var_dump(0=="ZERO") \\ \\"'." ' \\\\    ",
            'id'=>123,
        ];
?>
<span style="display: none;" class="ajax-data"><?=json_encode($data)?></span>
<script type="text/javascript">
    /* Error */
    // var json = JSON.parse('<?=json_encode($data)?>');
    /* Error solved */
    var json = JSON.parse($('.ajax-data').html());
    console.log(json)
    /* automatically assigned value by name attr */
    for(x in json){
        $('[name="'+x+'"]').val(json[x]);
    }
</script>