Rinto Andrews Rinto Andrews - 1 year ago 103
JSON Question

How to Convert Model Object to JSON

How can i convert model Object to JSON Format Without Using any frameworks ?

@interface modelData : NSObject

// store name
@property(nonatomic,strong) NSString *name;

// store release date
@property(nonatomic,strong) NSString *releaseDate;

//store image
@property(nonatomic,strong)NSString *image;

// init with local json
-(instancetype)initWithName :(NSString*)name withReleaseDate:(NSString*)releaseDate withImage:(NSString*)imageName;


Answer Source

To do this without other frameworks you can create some method like :

- (NSDictionary *)toJSON {
    return @{
        @"image" : self.image,
        @"releaseDate" : self.releaseDate,
        @"name" : self.name

So if object looks like this modelData("imageName","01.05.2016","name") the toJSON method gives you :

{ "image" : "imageName", "releaseDate" : "01.05.2016", "name" : "name" }

So the

NSDictionary *dict = [modelObjectInstance toJSON]

gives you NSDictionary with you object.

Then you can get JSON string by :

NSData *data = [NSJSONSerialization dataWithJSONObject:dict
                                                   options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
if (! data) {
    NSLog(@"Error: %@", error);
} else {
    NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];


Please remeber that it will work when you object is simple, like in your example (it have only NSString properties). If you have more complex object with some custom classes properties. You have to provide more logic to create that json in that way.

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