Question

what is the length od 'JSB' string​

Answer 1

Answer:

Lets start with the json string:

var jsonString = '{"name":"John"}';

you can easily determine its length:

alert("The string has "+jsonString.length+" characters"); // will alert 15

Then parse it to an object:

var jsonObject = JSON.parse(jsonString);

A JavaScript Object is not an Array and has no length. If you want to know how many properties it has, you will need to count them:

var propertyNames = Object.keys(jsonObject);

alert("There are "+propertyNames.length+" properties in the object"); // will alert 1

If Object.keys, the function to get an Array with the (own) property names from an Object, is not available in your environment (older browsers etc.), you will need to count manually:

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