iOS/iPhone and JSON (Create JSON and JSON Parsing, Objective-C)

    // { "MemberID":"1", "Name":"Weerachai", "Tel":"0819876107" }
    
    NSString *stringData = @"{ \"MemberID\":\"1\", \"Name\":\"Weerachai\", \"Tel\":\"0819876107\" }";
    NSData *jsonData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
    
    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    NSArray *keys = [jsonObjects allKeys];
    
    // value in key name
    NSString *strMemberID = [jsonObjects objectForKey:@"MemberID"];
    NSString *strName = [jsonObjects objectForKey:@"Name"];
    NSString *strTel = [jsonObjects objectForKey:@"Tel"];
    NSLog(@"MemberID = %@",strMemberID);
    NSLog(@"Name = %@",strName);
    NSLog(@"Tel = %@",strTel);
    
    NSLog(@"====================");
    
    // values in foreach loop
    for (NSString *key in keys) {
        NSLog(@"%@ is %@",key, [jsonObjects objectForKey:key]);
    }

    // { "MemberID":"1", "Name":"Weerachai", "Tel":"0819876107" }
    
    NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://www.thaicreate.com/json/"]];
    
    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    NSArray *keys = [jsonObjects allKeys];
    
    // value in key name
    NSString *strMemberID = [jsonObjects objectForKey:@"MemberID"];
    NSString *strName = [jsonObjects objectForKey:@"Name"];
    NSString *strTel = [jsonObjects objectForKey:@"Tel"];
    NSLog(@"MemberID = %@",strMemberID);
    NSLog(@"Name = %@",strName);
    NSLog(@"Tel = %@",strTel);
    
    NSLog(@"====================");
    
    // values in foreach loop
    for (NSString *key in keys) {
        NSLog(@"%@ is %@",key, [jsonObjects objectForKey:key]);
    }

    // [{ "MemberID":"1", "Name":"Weerachai", "Tel":"0819876107" }, { "MemberID":"2", "Name":"Win", "Tel":"021978032" }, { "MemberID":"3", "Name":"Eak", "Tel":"087654321" }]
    
    NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://www.thaicreate.com/json/"]];
    
    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    
     // values in foreach loop
    for (NSDictionary *dataDict in jsonObjects) {
        NSString *strMemberID = [dataDict objectForKey:@"MemberID"];
        NSString *strName = [dataDict objectForKey:@"Name"];
        NSString *strTel = [dataDict objectForKey:@"Tel"];
        NSLog(@"MemberID = %@",strMemberID);
        NSLog(@"Name = %@",strName);
        NSLog(@"Tel = %@",strTel);
        
        NSLog(@"====================");
    }

    /*** Create JSON ***/
    NSMutableDictionary *nameElements = [NSMutableDictionary dictionary];
    [nameElements setObject:@"1" forKey:@"MemberID"];
    [nameElements setObject:@"Weerachai" forKey:@"Name"];
    [nameElements setObject:@"0819876107" forKey:@"Tel"];
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:nameElements
                                                       options:NSJSONWritingPrettyPrinted
                                                         error:nil];
    
    // Result
    // { "MemberID":"1", "Name":"Weerachai", "Tel":"0819876107" }
    
    /*** Read JSON ***/
    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    NSArray *keys = [jsonObjects allKeys];
    // values in foreach loop
    for (NSString *key in keys) {
        NSLog(@"%@ is %@",key, [jsonObjects objectForKey:key]);
    }

    /*** Create JSON ***/
    
    NSMutableArray *myObject;
    
    // A dictionary object
    NSDictionary *dict;
    
    // Define keys
    NSString *memberid;
    NSString *name;
    NSString *tel;
    
    // Define keys
    memberid = @"MemberID";
    name = @"Name";
    tel = @"Tel";
    
    
    // Create array to hold dictionaries
    myObject = [[NSMutableArray alloc] init];
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys:
            @"1", memberid,
            @"Weerachai", name,
            @"0819876107", tel,
            nil];
    [myObject addObject:dict];
    
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys:
            @"2", memberid,
            @"Win", name,
            @"021978032", tel,
            nil];
    [myObject addObject:dict];
    
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys:
            @"3", memberid,
            @"Eak", name,
            @"087654321", tel,
            nil];
    [myObject addObject:dict];
    
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:myObject
                                                       options:NSJSONWritingPrettyPrinted
                                                         error:nil];
    
    // Resutl
    // [{ "MemberID":"1", "Name":"Weerachai", "Tel":"0819876107" }, { "MemberID":"2", "Name":"Win", "Tel":"021978032" }, { "MemberID":"3", "Name":"Eak", "Tel":"087654321" }]
    
    
    /*** Read JSON ***/
    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    
    // values in foreach loop
    for (NSDictionary *dataDict in jsonObjects) {
        NSString *strMemberID = [dataDict objectForKey:@"MemberID"];
        NSString *strName = [dataDict objectForKey:@"Name"];
        NSString *strTel = [dataDict objectForKey:@"Tel"];
        NSLog(@"MemberID = %@",strMemberID);
        NSLog(@"Name = %@",strName);
        NSLog(@"Tel = %@",strTel);
        
        NSLog(@"====================");
    }