NSString *jsonString = _requestStr;
NSError *error = nil;
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSData *jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:nil error:&error];
NSData *prettyJsonData = [NSJSONSerialization dataWithJSONObject:jsonObject options:NSJSONWritingPrettyPrinted error:&error];
NSString *pretyPrintedJsonStr = [[NSString alloc] initWithData:prettyJsonData encoding:NSUTF8StringEncoding];
NSString *formatJsonStr = [pretyPrintedJsonStr stringByReplacingOccurrencesOfString:@"\\" withString:@""];
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