How to generate JSON programmatically using JSON framework for iPhone

Create an array or dictionary of objects representing the information you want to send via JSON. Having done that, send -JSONRepresentation to the array/dictionary. That method returns a JSON string, and you send it to the server.

For instance:

NSDictionary *o1 = [NSDictionary dictionaryWithObjectsAndKeys:    @"some value", @"key1",    @"another value", @"key2",    nil];NSDictionary *o2 = [NSDictionary dictionaryWithObjectsAndKeys:    @"yet another value", @"key1",    @"some other value", @"key2",    nil];NSArray *array = [NSArray arrayWithObjects:o1, o2, nil];NSString *jsonString = [array JSONRepresentation];// send jsonString to the server

After executing the code above, jsonString contains:

[    {        "key1": "some value",        "key2": "another value"    },    {        "key1": "yet another value",        "key2": "some other value"    }]

Create an NSMutableDictionary or NSMutableArray and populate it with NSNumbers and NSStrings. Call [<myObject> JSONRepresentation] to return a JSON string.

eg:

NSMutableDictionary *dict = [NSMutableDictionary dictionary];[dict setObject:@"Sam" forKey:@"name"];[dict setObject:[NSNumber numberWithInt:50000] forKey:@"reputation"];NSString *jsonString = [dict JSONRepresentation];