how to parse array of objects using json for iphone

Question

I have a problem parsing the array of objects from the JSON result.

[
    {
        "first_name":"vijay",
        "last_name":"last",
        "creditCardNumber":"178978977779787979",
        "month":"02","year":"2012",
        "address":"Addres2"
    }

    { 
        "first_name":"vijay",
        "last_name":"last",
        "creditCardNumber":"178978977779787979",
        "month":"02","year":"2012",
        "address":"Addres2"
    }

    {
        "first_name":"vijay",
        "last_name":"last",
        "creditCardNumber":"178978977779787979",
        "month":"02","year":"2012",
        "address":"Addres2"
    }
]

I wish to extract creditCardNumber value from all objects in the array.

Your JSON data is not valid: values in an array must be separated by comma. As for parsing JSON, there are a few possible libraries: JSONKit, SBJSON, TouchJSON, yajl-objc. — user557219
– user557219, Commented Feb 11, 2011 at 20:14

Dan Ray · Accepted Answer · 2011-02-11 18:37:29Z

8

Google "JSON Framework". Follow the (easy) instructions to install it.

Then go:

//let's say there's NSString *jsonString.

NSArray *userData = [jsonString JSONValue];

NSMutableArray *creditCards = [NSMutableArray array];
for (NSDictionary *user in userData) {
    [creditCards addObject:[user objectForKey:@"creditCardNumber"]];
}

You'll drop out the bottom of that with NSMutableArray *creditCards full of NSString objects containing the credit card numbers.

answered Feb 11, 2011 at 18:37

Dan Ray

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2 Comments

rithik Over a year ago

hi dude it exactly what i needed and u r really superb.thanku.could please explain about that.how that works.since www.json.org specified that [ means array { means object . i have little confusion please.....

Dan Ray Over a year ago

Your JSON is an array of objects. So you mimic that in Obj-C. JSON Framework is going to parse jsonString and return whatever type of object the top level of the JSON is (in this case an array). So you catch it in an NSArray. Then each element of that NSArray is an NSDictionary, with a "creditCardNumber" field.

André Rodrigues · Accepted Answer · 2014-03-19 11:37:20Z

2

@Dan Ray answer is correct, but if you want to avoid third-party librairies you can use NSJSONSerialization:

Assuming that NSData *responseData is containing your JSON.

NSArray *userData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:nil];

NSMutableArray *creditCards = [NSMutableArray array];
for (NSDictionary *user in userData) {
    [creditCards addObject:[user objectForKey:@"creditCardNumber"]];
}

Source: NSJSONSerialization.

answered Mar 19, 2014 at 11:37

André Rodrigues

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