{
        "user_name":"Nicejinux",
        "age":39,
        "numberOfFriends":3,
        "hasGirlFriend":false,
        "height":178.5,
        "birthday":"20000101"
        "job":"DEVELOPER"
        "pets":[
            {
                "kind":"dog",
                "name":"doggy",
                "age":"2 years",
            }, {
                "kind":"cat",
                "name":"kitty",
                "age":"1 year"
            }
        ]
    }

// People.h

// enum type
typedef NS_ENUM (NSInteger, JobType) {
    JobTypeNone = 0,
    JobTypeDoctor,
    JobTypeDeveloper,
    JobTypeDesigner,
};

// People Model
@interface People : NSObject

@property (nonatomic, strong) NSString <NXNotNull> *name;
@property (nonatomic, strong) NSNumber *age;
@property (nonatomic, strong) NSArray <Pet *> *pets;
@property (nonatomic, strong) NSDate *birthday;
@property (nonatomic, assign) JobType jobType;
@property (nonatomic, assign) NSInteger numberOfFriends;
@property (nonatomic, assign) BOOL hasGirlFriend;
@property (nonatomic, assign) CGFloat height;

@end

// Pet Model
@interface Pet : NSObject

@property (nonatomic, strong) NSString *kind;
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSNumber *age;

@end


// People.m

// optional method for NXNotNull protocol
- (void)propertyWillSetNil:(NSString *)propertyName propertyClass:(Class)propertyClass
{
    // You can assert or do something else here.
    NSLog(@"%@ (%@) property should not be nil", propertyName, propertyClass);
}

- (People *)mapJsonToPeopleModelWithData:(NSDictionary *)dic 
{	
    // create mapper for each mappings.
    NXMapper *mapper = [[NXMapper alloc] init];

    // add array mapping with element class
    // pets (NSArray) element will map as a Pet class in the People class
    NXArrayMapping *arrayMapping = [NXArrayMapping mapForArrayItemClass:Pet.class itemKey:@"pets" onClass:People.class];
    [mapper addArrayMapping:arrayMapping];

    // add object mapping with field name (different object name)
    // "user_name" which is from Json data will map to "name" property in the People class 
    NXObjectMapping *objectMapping = [NXObjectMapping mapForJsonKey:@"user_name" toModelKey:@"name" onClass:People.class];
    [mapper addObjectMapping:objectMapping];

    // "job" which is from Json data will map to "jobType" in the People class
    objectMapping = [NXObjectMapping mapForJsonKey:@"job" toModelKey:@"jobType" onClass:People.class];
    [mapper addObjectMapping:objectMapping];

    // add date mapping with formatter
    // birthday will map as a NSDate with formatter (yyyyMMdd)
    NXDateMapping *dateMapping = [NXDateMapping mapForDateKey:@"birthday" formatter:@"yyyyMMdd" onClass:People.class];
    [mapper addDateMapping:dateMapping];

    // add enum mapping with enum type list
    // "jobType" which is from Json data "job" will map as JobType in the People class
    NXEnumMapping *enumMapping = [NXEnumMapping mapForEnumKey:@"jobType" enumTypeList:@[@"NONE", @"DOCTOR", @"DEVELOPER", @"DESIGNER"] onClass:People.class];
    [mapper addEnumMapping:enumMapping];

    // initialize jsonkit with Json data and Mapper
    NXJsonKit *jsonKit = [[NXJsonKit alloc] initWithJsonData:dic mapper:mapper];

    // get mapped object that you specified class
    People *people = [jsonKit mappedObjectForClass:[People class]];

    return people;
}