How can I validate & beautify JSON through a jquery/javascript plugin

I have a requirement where in I get JSON data from backend and I have to show that in textarea.currently, the data comes but its not formatted and validated.Now

1)How can I beautify JSON in the textarea ? 2)How can I validate it before saving ?

I have searched for all javascript/jquery plugins but I am not getting what I want.I want something like jslint

Thanks in advance

You can use the following to check that a string is a valid representation of a JSON object:

function parseJson(str) {
    try {
        return JSON.parse(str);
    }
    catch (err) {
        return false;
    }
}

Usage:

var parsed = parseJson(someInput);
if (parsed === false) {
    // Invalid json
}

If you also need to validate the object using some custom logic (e.g. "I need your object to have attributes X and Y"), take a look at JsonSchema.