How to check if a string is JSON or not

0 votes

 have a simple AJAX call, and the server will return either a JSON string with useful data or an error message string produced by the PHP function mysql_error(). How can I test whether this data is a JSON string or the error message.

It would be nice to use a function called isJSON just like you can use the function instanceof to test if something is an Array.

This is what I want:

if (isJSON(data)){
    //do some data stuff
}else{
    //report the error
    alert(data);
}
Aug 19, 2020 in PHP by kartik
• 37,490 points
923 views

1 answer to this question.

0 votes

Hello @kartik,

Use JSON.parse

function isJson(str) {
    try {
        JSON.parse(str);
    } catch (e) {
        return false;
    }
    return true;
}

Hope it helps!!
Thank you!!

answered Aug 19, 2020 by Niroj
• 82,680 points

Related Questions In PHP

0 votes
1 answer

How to check if memcache or memcached is installed for PHP?

Hii, You can look at phpinfo() or check ...READ MORE

answered Nov 6, 2020 in PHP by Niroj
• 82,680 points
307 views
0 votes
1 answer

How to check if a string contains a specific text using php?

Hello @kartik, Use the strpos function:  $haystack = "foo bar baz"; $needle ...READ MORE

answered Nov 10, 2020 in PHP by Niroj
• 82,680 points
603 views
0 votes
1 answer

How can I use PHP to check if a directory is empty?

Hello @kartik, It seems that you need scandir instead of ...READ MORE

answered Nov 10, 2020 in PHP by Niroj
• 82,680 points
852 views
0 votes
1 answer

How to convert a string to JSON object in PHP?

Hello @kartik, it seems that your JSON is ...READ MORE

answered Oct 20, 2020 in PHP by Niroj
• 82,680 points
574 views
+1 vote
1 answer

How to make anchor tag with routing using Laravel?

Hey @kartik, First you have to go to ...READ MORE

answered Mar 18, 2020 in Laravel by Niroj
• 82,680 points
6,775 views
0 votes
1 answer

What is redirection in Laravel?

Named route is used to give specific ...READ MORE

answered Mar 18, 2020 in Laravel by Niroj
• 82,680 points
789 views
0 votes
1 answer

How to install Laravel via composer?

Hello, This is simple you just need to ...READ MORE

answered Mar 23, 2020 in Laravel by Niroj
• 82,680 points
590 views
+1 vote
1 answer

What are named routes in Laravel and How can specify route names for controller actions?

Hey @kartik, Named routing is another amazing feature of ...READ MORE

answered Mar 23, 2020 in Laravel by Niroj
• 82,680 points
7,179 views
0 votes
1 answer

How to check if php session is already started or not?

Hello kartik, Use session_id(), it returns an empty string ...READ MORE

answered Apr 1, 2020 in PHP by Niroj
• 82,680 points
1,562 views
0 votes
1 answer

How to check if a string is an email address in PHP?

Hello, Try this without regular expressions: <?php ...READ MORE

answered Nov 3, 2020 in PHP by Niroj
• 82,680 points
155 views