NSDictionary+CWJSONPointer

A native Objective-C JSON Pointer Category.

Development discussion [here] devLink

To use this category, include it in your code with:

#import "NSDictionary+CWJSONPointer.h"

You can then use an RFC6901 JSON Pointer to fetch objects:

NSDictionary *json = [NSJSONSerialization JSONObjectWithData: data options:0 error: &error ];
[json objectForPointer: @"/foo/bar"   ]

Or you can do the same using a JSON URI Fragment:

NSDictionary *json = [NSJSONSerialization JSONObjectWithData: data options:0 error: &error ];
[json objectForPointer: @"#/foo/bar" ]

If you want to validate the returned object type use of the following methods:

NSDictionary *json = [NSJSONSerialization JSONObjectWithData: data options:0 error: &error ];
[json NSArrayForPointer:      @"/foo/bar" ]
[json BooleanForPointer:      @"/foo/bar" ]
[json NSStringForPointer:     @"/foo/bar" ]
[json NSNumberForPointer:     @"/foo/bar" ]
[json NSDictionaryForPointer: @"/foo/bar" ]

If you want to validate the returned object type for fragments use the same methods:

NSDictionary *json = [NSJSONSerialization JSONObjectWithData: data options:0 error: &error ];
[json NSArrayForPointer:      @"#/foo/bar" ]
[json BooleanForPointer:      @"#/foo/bar" ]
[json NSStringForPointer:     @"#/foo/bar" ]
[json NSNumberForPointer:     @"#/foo/bar" ]
[json NSDictionaryForPointer: @"#/foo/bar" ]

Note: Boolean returns an NSNumber with three possible states: null, 0 or 1. If the json contains the number 1 or 0 it will return valid, but will return false for all numbers above 1 or below 0.