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parse a string that contains array with strings

I am struggling to parse a string that contains array. And the array also contains list of arrays.
Each of the array contains string.
code here
let a = "[[48934, 'Danial Brendon', 'developer'],[48934, 'Nicki Lopez', 'developer']]";
console.log(JSON.parse(a))
I tried using JSON.parse() but did not work, may be because JSON.parse() also want to parse the string.
I am having difficulty with this even this looks simple. I could not find any similar question/answer like this.
Thanks.

To JSON parse , you need double quotes instead of single. like this ...
let a = '[[48934, "Danial Brendon", "developer"],[48934, "Nicki Lopez", "developer"]]';
console.log(JSON.parse(a));

Decode a JSON String in Javascript

I have a encoded JSON string returning the following sting which I am displaying on my webpage from a database call.
{"Value 1":"1234","Value 2":"123456"}
How do I decode this string and also format the data to be displayed in a table?
I am at a lost as how to do this. Thanks

Here is how to turn a string containing a JSON into an object:
JSON.parse('{"Value 1":"1234","Value 2":"123456"}');

correctly adding to json from javascript

hi im having trouble correctly adding to my json
here is the code.
When i console.log the string im trying to add is
{"type":"#","name":"wh2xogvi","list":[{"0":"background-color"},{"1":"border"},{"2":"width"}, {"3":"height"},{"4":"margin"}],"listvalues":[{"0":"#aaa"},{"1":"2px solid #000"},{"2":"1040px"},{"3":"50px"},{"4":"0 auto"}]}
it is valid json
var jsonltoload = JSON.stringify(eval("(" + jsonloadtostring + ")"));
console.log(jsonltoload); // this is the console log i was talking about higher up
fullJSON.styles.objectcss.push(jsonltoload);
But when i actually look at the json it is wrong ends up something like this
"{\"type\":\"#\",\"name\":\"unkd42t9\",\"list\":[{\"0\":\"background-color\"},{\"1\":\"border\"},{\"2\":\"width\"},{\"3\":\"height\"},{\"4\":\"clear\"}],\"listvalues\":[{\"0\":\"#ddd\"},{\"1\":\"2px solid #000\"},{\"2\":\"100%\"},{\"3\":\"50px\"},{\"4\":\"both\"}]}",
the fullJSON comes from JSON.parse(json); which comes from a file

You seem to confuse JSON, a textual, language-independent data representation, with JavaScript objects, a language-specific data type.
JSON.stringify returns a string (containing JSON), so jsonltoload is a string. I guess you simply want to parse the JSON and add the resulting object:
var obj = JSON.parse(jsonloadtostring);
fullJSON.styles.objectcss.push(obj);

I think the JSON string is trying to escape the double quotes character you have added to string, resulting in the string. try to enclose the whole string with single quotes rather than double quotes

JSON parse and single quote

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.

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($item_localized)); ?>);
This is, however, silly. Since JSON is a subset of JavaScript, you can just use it directly as a JavaScript literal.
item = <?php echo json_encode($item_localized); ?>;

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

json_encode and JSON.parse does not harmonize

I get this output on my php page with json_encode
{"id":"761","user":"Moderator","message":"test"}
{"id":"760","user":"Patrick","message":"test"}
Now i want to parse theses values with JSON.parse in javascript, to get an array.
But it does not work.
It works only if i have one json Objekt.
What is the best way to solve this?
To split at '}' and parse every string that i will get?

{}{} is not valid JSON. You need to have an array wrap these and separate them with commas like [{},{}]. You can do this in PHP via:
$entries = array();
foreach ($database_entry as $array) {
$entries[] = $array;
}
echo json_encode($entries);
That is you should only call json_encode once.

This output is not a proper JSON object or array. What you want to do is wrap your objects in square brackets, and separate them with commas. The output should look like this:
[{"id":"761","user":"Moderator","message":"test"},
{"id":"760","user":"Patrick","message":"test"}]
You will need to change your PHP to generate the output in this way.

JSON.parse applies only strings:
JSON.parse(text[, reviver])
text is
the string to parse as JSON. See the JSON object for a description of JSON syntax. MDN.

You'll need to output the objects into a JSON array, with each object/array item separated by a comma:
{
"users": [
{"id":"761","user":"Moderator","message":"test"},
{"id":"760","user":"Patrick","message":"test"}
]
}