CODEWITHSUNDEEP
javascriptjson
Funonly
Funonly

Reputation: 962

A good and fast way to check if a JSON object contains certain values

I am looking for direct way of checking if the JSON I recieve from my backend holds the value i need without throwing an exception or making a for loop of if-statements.

I would like it to look something like this:

success = function(requestBody, xhr, options){
    jsonObj = JSON.parse(requestBody);
    if (!json.path.to.item.is.very.deep[0].really[3]){
        responseErrorHandler(requestBody, xhr, options)
    }
    // More Code here
}

This code obviously does not work because if I.E. the json object does not have the item object and error is throw and the code stops.

I can make a for-loop and parse the json but i like to see a shortcut.

Upvotes: 0

Views: 79

Answers (1)

Kos
Kos

Reputation: 72271

An error is thrown - it's a good thing, you can handle it! Wrap the attempt to access the value (and only that line, to avoid catching unrelated errors) in try-catch, for example:

try {
    var x = json.path.to.item.is.very.deep[0].really[3];
} catch(e) {
    // ... handle failure... 
    return;
}
if (typeof x !== "number") { // or whatever you need
    // ... handle failure...
    return;
}
// handle success

Upvotes: 1

Related Questions