JSON parse and single quote

Question

I have JSON data passed by PHP and I need to parse it in Javascript.

item = JSON.parse('<?=json_encode($item_localized);?>');

Some trouble. I have string in $item_localized which contains single quote. Jsonlint says it valid json. Because I use '<?=json_encode($item_localized);?>' - I receive message Uncaught SyntaxError: Unexpected identifier. I cannot use double quotes. I tried replace single quotes with \\' but it's not working.

Answer 1

json_encode will generate a JSON text.

JSON.parse needs to receive a string containing a JSON text.

You do need to quote the string, but you can't simply place ' around it because that won't escape any characters in the string that have special meaning in a string literal (like other ' characters).

If you put a string into json_encode then you will get out a JSON text consisting of a string representation of another JSON text. Since JSON is a JS subjet, that string will be JS safe:

item = JSON.parse(<?php echo json_encode(json_encode($item_localized)); ?>);

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This is, however, silly. Since JSON is a subset of JavaScript, you can just use it directly as a JavaScript literal.

item = <?php echo json_encode($item_localized); ?>;

Answer 2

What about item = <?=json_encode($item_localized);?>; ?