#import <Foundation/Foundation.h>
 
@interface NSDictionary (JSON)
 
- (NSString *)jsonString;
 
- (void)writeToJsonFile:(NSString *)path atomically:(BOOL)atomically;
 
+ (NSDictionary *)dictionaryWithContentsOfJsonFile:(NSString *)path;
 
 
 
@end

#import "NSDictionary+JSON.h"
#import "NSString+JSON.h"
 
@implementation NSDictionary (JSON)
 
- (NSString *)jsonString {
    NSError *error = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
                                                       options:0
                                                         error:&error];
    if (error)
        return nil;
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    return jsonString;
}
 
- (void)writeToJsonFile:(NSString *)path atomically:(BOOL)atomically {
    NSData *content = [[self jsonString] dataUsingEncoding:NSUTF8StringEncoding];
    [content writeToFile:path atomically:atomically];
}
 
+ (NSDictionary *)dictionaryWithContentsOfJsonFile:(NSString *)path {
    NSError *error = nil;
    NSString *content = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
    if (error) {
        return nil;
    }
    id result = [content jsonObject];
    if (![result isKindOfClass:[self class]]) {
        return nil;
    }
    return result;
}
 
 
 
@end