how to know if it is json or not code example

Example 1: javascript check if string is json parsable

var isJsonParsable = string => {
    try {
        JSON.parse(string);
    } catch (e) {
        return false;
    }
    return true;
}

Example 2: check if the data can be parsed javascript

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