JSON Parsing Using Nsjsonserialization in iOS

JSON parsing using NSJSONSerialization in iOS

First of all in your JSON response dictionary, under the key 'RESPONSE' you have a array not a dictionary and that array contains dictionary object.
So to extract username and email ID so as below

NSMutableDictionary *response = [[[json valueForKey:@"RESPONSE"] objectAtIndex:0]mutableCopy];
 NSString *username = [response valueForKey:@"username"];
 NSString *emailId = [response valueForKey:@"email"];

iOS - Parsing JSON Dictionary with NSJSONSerialization in Swift

The result of the deserialization will be an array:

let data = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)

do {
    let dataArray = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! NSArray

    for event in dataArray {
        print(event)
    }

} catch let error as NSError {
    print("Failed to load: \(error.localizedDescription)")
}

How to use NSJSONSerialization

Your root json object is not a dictionary but an array:

[{"id": "1", "name":"Aaa"}, {"id": "2", "name":"Bbb"}]

This might give you a clear picture of how to handle it:

NSError *e = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &e];

if (!jsonArray) {
  NSLog(@"Error parsing JSON: %@", e);
} else {
   for(NSDictionary *item in jsonArray) {
      NSLog(@"Item: %@", item);
   }
}

Parsing JSON using NSJSONSerialization

NSJSONSerialization can take a chunk of JSON data and turn into objects and it can do the same in the other direction that is by taking objects and converting them into the JSON data.

For easy understanding of NSJSONSerialization and interaction with Twitter, i would recommend you to use THIS and THIS tutorials.

Hope this helps!

Using NSJSONSerialization to parse JSON

Your json that you parsed contains a dictionary named data. Within that dictionary is an array of current_condition. Keep drilling down through the data structures to find the attributes you are looking for:

NSDictionary *data = [parsedJSON objectForKey:@"data"];
NSArray *currentConditions = [data objectForKey:@"current_condition"];
NSDictionary *condition = [currentConditions objectAtIndex:0];
NSString *tempC = [condition objectForKey:@"temp_C"];

Parsing JSON with NSJSONSerialization - NSException thrown

The JSON object you've shown has 348 listed as an integer value. So when NSJSONSerialization gets its hands on it, it converts it to an NSNumber. You'll need to call -[NSNumber stringValue] on [jsonObject objectForKey:@"data"] to convert the NSNumber to an NSString.

Parse json with NSJSONSerialization class using objectForKey in iOS

You have to access the 0 item of item array:

NSArray *mainArray = [item objectAtIndex:0];
(NSDictionary *obj in mainArray) {
     NSString *name = [obj objectForKey:@"name"];
}

When you got this error: -[__NSArrayM objectForKey:], you need to realize that the object that you're trying to access isn't a dictionary. It's an array (__NSArrayM), so you have to first access the 0 index, and then starting exploring the dictionary.

Take a look at this amazing tutorial, from Ray Wenderlich, that explains everything about crashes.

Parsing data using NSJSONSerialization.JSONObjectWithData() but cannot access Array groups only strings

You can try like this way, declare 3 array first.

var logArr: [[String: AnyObject]] = [[String: AnyObject]]()
var imageArr: [[String: AnyObject]] = [[String: AnyObject]]()
var valveArr: [[String: AnyObject]] = [[String: AnyObject]]()

Now use this array where you are getting response

if let json = try NSJSONSerialization.JSONObjectWithData(data!, options:.AllowFragments) as? Array<Dictionary<String, AnyObject>> {
for item in json {
    if let dict = item as? Dictionary<String, AnyObject> {
        if let nameStr = dict["name"] as? String {
            incidentList.valueStr = nameStr
        }
        if let codeStr = dict["dma"] as? String {
            incidentList.valueStr = codeStr
        }
        if let region = dict["region"] as? String {
            incidentList.valueStr = region
        }
        if let ncLead = dict["nc_lead"] as? String {
            incidentList.valueStr = ncLead
        }
        if let logs = dict["logs"] as? [[String: AnyObject]] {
            self.logArr = logs
        }
        if let valveOps = dict["valveOps"] as? [[String: AnyObject]] {
            self.valveArr = valveOps
        }
        if let images = dict["images"] as? [[String: AnyObject]] {
            self.imageArr = images
        }

---

Related Topics