How can I create a json string in objective C?

Question

I have to generate a json string dynamically and need to send to the server. Is any body know how to do it using NSJSONSerialization . Below is my string

{
    "surveyid": "Survey1",
    "responsetime": "dd/mm/yyyy hh:mm:ss",
    "location": null,
    "surveyresponses": [
        {
            "questionid": "111",
            "responses": [
                {
                    "response": "Good",
                    "optionid": 1,
                    "language": "en"
                }
            ]
        },
        {
            "questionid": "112",
            "responses": [
                {
                    "response": "bad",
                    "optionid": 2,
                    "language": "en"
                }
            ]
        }

    ]
}

How can I create a string.json?

score 4 · Answer 1 · edited Nov 08 '21 at 05:23

4

Set dictionary for Data with JSON object like below:

NSError *err;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:yourDataDictionary options:NSJSONWritingPrettyPrinted error:&err];

NSLog(@"JSON = %@", [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]);

See also this link sending-string-as-json-object

edited Nov 08 '21 at 05:23

Nimantha

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answered Mar 20 '13 at 06:48

Paras Joshi

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@krishna see this link also.. http://stackoverflow.com/questions/11882696/create-a-jsonstring-in-ios – Paras Joshi Mar 20 '13 at 07:28

score 3 · Accepted Answer · answered Mar 20 '13 at 07:35

i totally agree with @Apurv, actually @Paras Joshi give the actual answer to your question...(how to send)

NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
[dict setValue:@"Survey1" forKey:@"surveyid"];
[dict setValue:@"responsetime" forKey:@"dd/mm/yyyy hh:mm:ss"];
.
.
.

and then an array forKey @"surveyresponses"... in it again create a dictionary...bla..bla

Please make it clear first what you exactly want... How to send a JSON string / how to generate a JSON value.

learn to accept the answers as well as analyse the answers perfectly, and make your questions clear.

The best answer seems to be if we combine what you posted here, and then append ParasJoshi 's answer. One shows how to build the dictionary object, the other on how to make it into a string. — Volomike, Dec 16 '15 at 23:21

Apurv · Answer 3 · 2013-03-20T06:52:39.330

1

If you already have JSON string, you can use it directly.

If you have an object(array and dictionary) and if you want to convert it into json string, use below method of NSJSONSerialization.

NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
[dict setValue:@"Survey1" forKey:@"surveyid"];
//Add rest of the details in the dictionary

//Pass the dict in below method
    + (NSData *)dataWithJSONObject:(id)dict options:(NSJSONWritingOptions)opt error:(NSError **)error

Now, use above data to create a string object.

edited Mar 20 '13 at 06:52

answered Mar 20 '13 at 06:42

Apurv

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i need to generate a jsonstring like above from the scracth – krishna Mar 20 '13 at 06:46
Create a dictionary first. Add proper key values to it and then use above function. – Apurv Mar 20 '13 at 06:48
I coudnt generate a proper dictionary for the above one that is the real pblm – krishna Mar 20 '13 at 07:06

score 1 · Answer 4 · edited Mar 23 '13 at 14:13

Sample code to generate Json String:

 NSString *strdata =[NSString stringWithFormat:@"&data={\"user_id\":\"%@\",\"auth_token\":\"%@\",\"coupon_id\":\"%@\",\"rest_name\":\"%@\",\"name\":\"%@\",\"description\":\"%@\",\"condition\":\"%@\",\"coupon_code\":\"%@\",\"parent_menu_item\":\"%@\",\"discount_item\":\"%@\",\"discount_pecent\":\"%@\",\"start_date\":\"%@\",\"end_date\":\"%@\",\"status\":\"%@\"}",userid,auth_token,couponid,restuserid,txtCoupannm.text,txtvwCoupandesc.text,txtvwcoupancond.text,couponcode,appDelegate.tempparentmenuId,appDelegate.tempdiscountitemId,txtPercent.text,startdate.text,enddate.text,@"1"];

score 1 · Answer 5 · answered Mar 20 '13 at 07:27

Try this : if there are more then one item then put (str = ) in loop

    NSString *str = [NSString stringWithFormat:@"json_data={\"data\":["];

    str = [str stringByAppendingString:[NSString stringWithFormat:@"{\"type\":\"%@\",\"surveyid\":\"%@\",\"veriety\":\"%@\",\"responsetime\":\"%@\",\"rate\":\"%@\",\"seeddepth\":\"%@\",\"groundspeed\":\"%@\",\"note\":\"%@\",\"AnhRate\":\"%@\",\"AnhVarRate\":\"%@\",\"WetRate\":\"%@\",\"WetVarRate\":\"%@\",\"WetType\":\"%@\",\"DryRate\":\"%@\",\"DryVarRate\":\"%@\",\"DryType\":\"%@\",\"MicroRate\":\"%@\",\"MicroVarRate\":\"%@\",\"MicroType\":\"%@\",\"NoteApp\":\"%@\",\"userid\":\"%@\",\"flid\":\"%d\",\"catid\":\"%d\",\"subcatId\":\"%d\",\"categoryname\":\"%@\",\"subcategoryname\":\"%@\",\"activitydate\":\"%@\",\"DateCreated\":\"%@\",\"DateUpdated\":\"%@\"},",Your variable

    if ([str length] > 0) {
            str =[str substringToIndex:[str length] - 1];
    }

str = [str stringByAppendingString:@"]}"];

score 1 · Answer 6 · answered Sep 21 '15 at 13:40

I had to build something similar and applied what I did to your string - it may not be the best way to achieve the result, but it worked for me. For the inner survey responses array (in my case it was a different array), I simply chained several together.

NSString *ts=@"2015-04-03T13:00:00";
    NSString *outer = [NSString stringWithFormat: @"{\"surveyId\":\"Survey1\", \"responsetime\":\"%@\", \"location\":\"%@\", \"surveyresponses\":[{\"", ts, @"null"];


    NSString * surveyresponse = [NSString stringWithFormat: @"questionid\":\"111\", \"responses\":[{\"response\":\"good\", \"optionid\":\%d\, \"language\":\"en\"}]", 1];

    NSString *ending = @"}]}";

    NSString *jsonStr = [NSString stringWithFormat:@"%@%@%@", outer, surveyresponse, ending];

    NSData * postdata = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];

    NSError * error = nil;
    id json = [NSJSONSerialization JSONObjectWithData:postdata options:0 error:&error];

    if (!json) {
        // handle error
        NSLog(@"json string error - %@", error.description);
    }
    NSLog(@"%@",[[NSString alloc] initWithData:postdata encoding:NSUTF8StringEncoding]);

what if i want to use just one string object.? – MRizwan33 Apr 13 '18 at 12:41 — MRizwan33, Apr 13 '18 at 12:41

score 0 · Answer 7 · answered Mar 20 '13 at 06:40

0

Assuming that you already have the JSON in an NSString, you can save it to a file by calling:

[jsonString writeToFile:@"/path/to/JSON.json" atomically:YES encoding:NSASCIIStringEncoding error:nil]

The documentation for this function is here.

answered Mar 20 '13 at 06:40

drewmm

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i need to generate a jsonstring like above from the scracth – krishna Mar 20 '13 at 06:45
What do you mean from scratch? Do you have the data in an `NSDictionary` object? If not, where are you getting the data from? – drewmm Mar 20 '13 at 06:48

score 0 · Answer 8 · edited Nov 08 '21 at 05:24

0

NSDictionary* jsonResp = [NSJSONSerialization JSONObjectWithData:respData options:kNilOptions error:&error];

edited Nov 08 '21 at 05:24

Nimantha

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answered Mar 20 '13 at 09:57

kowshik

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How can I create a json string in objective C?

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