How to send post request below params?

First you need to sent request using json format not direct as object

And Second

I think there is requires to change in service

Service should accept your request in this format.

{ "LoginID": 151, "UserID": 0, "SubUserID": 0, "WorkGroupID": 92, "WorksFor": "Doctor", "UserWorkGroup": 0, "SearchingFilters": { "GroupingOperator": "And", "Filters": [ { "SearchingValue": "04-13-2016", "SearchingName": "AppointmentDate", "SearchingOperator": "Ge" }, { "SearchingValue": "04-27-2016", "SearchingName": "AppointmentDate", "SearchingOperator": "Le" } ], "Groups": [ { "Groups": [ ], "GroupingOperator": "And", "Filters": [ ] } ] }, "Searching": true, "SortingOrder": "Desc", "RecordsCount": 10, "PageIndex": 0 } 

If you required to pass it as single object else add this in array if multiple object is send in request

@Raghvendra first of set your parameter in dictionary for passing parameter and then set your url
enter code here

-(void)call_WebService { NSMutableDictionary *dicParameter=[[NSMutableDictionary alloc] init]; [dicParameter setObject:@"" forKey:@"Parameter1"];// setObject - String/Dictionary/Array [dicParameter setObject:@"" forKey:@"parameter2"]; // setObject - String/Dictionary/Array [dicParameter setObject:@"" forKey:@"Parameter3"];// setObject - String/Dictionary/Array NSError *error = nil; NSData *data = [NSJSONSerialization dataWithJSONObject: dicParameter options:0 error:&error]; NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; if (error) NSLog(@"%s: JSON encode error: %@", __FUNCTION__, error); NSURL *url = [NSURL URLWithString:@"web Service url url"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; NSString *params = [NSString stringWithFormat:@"json=%@", [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSData *paramsData = [params dataUsingEncoding:NSUTF8StringEncoding]; [request addValue:@"8bit" forHTTPHeaderField:@"Content-Transfer-Encoding"]; [request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:paramsData]; NSURLResponse *response = nil; NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; if (error) NSLog(@"%s: NSURLConnection error: %@", __FUNCTION__, error); // examine the response NSString *responseString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSLog(@"responseString: %@",responseString); if(![responseString isEqualToString:@""]) { NSDictionary *dicFinalGetFacility = [NSJSONSerialization JSONObjectWithData:returnData options:kNilOptions error:&error]; NSLog(@"dicFinalGetFacility: %@",dicFinalGetFacility); } }