1# <small>nlohmann::</small>json_pointer
2
3```cpp
4template<typename RefStringType>
5class json_pointer;
6```
7
8A JSON pointer defines a string syntax for identifying a specific value within a JSON document. It can be used with
9functions [`at`](../basic_json/at.md) and [`operator[]`](../basic_json/operator%5B%5D.md). Furthermore, JSON pointers
10are the base for JSON patches.
11
12## Template parameters
13
14`RefStringType`
15:   the string type used for the reference tokens making up the JSON pointer
16
17!!! warning "Deprecation"
18
19    For backwards compatibility `RefStringType` may also be a specialization of [`basic_json`](../basic_json/index.md)
20    in which case `string_t` will be deduced as [`basic_json::string_t`](../basic_json/string_t.md). This feature is
21    deprecated and may be removed in a future major version.
22
23## Member types
24
25- [**string_t**](string_t.md) - the string type used for the reference tokens
26
27## Member functions
28
29- [(constructor)](json_pointer.md)
30- [**to_string**](to_string.md) - return a string representation of the JSON pointer
31- [**operator string_t**](operator_string_t.md) - return a string representation of the JSON pointer
32- [**operator==**](operator_eq.md) - compare: equal
33- [**operator!=**](operator_ne.md) - compare: not equal
34- [**operator/=**](operator_slasheq.md) - append to the end of the JSON pointer
35- [**operator/**](operator_slash.md) - create JSON Pointer by appending
36- [**parent_pointer**](parent_pointer.md) - returns the parent of this JSON pointer
37- [**pop_back**](pop_back.md) - remove last reference token
38- [**back**](back.md) - return last reference token
39- [**push_back**](push_back.md) - append an unescaped token at the end of the pointer
40- [**empty**](empty.md) - return whether pointer points to the root document
41
42## Literals
43
44- [**operator""_json_pointer**](../operator_literal_json_pointer.md) - user-defined string literal for JSON pointers
45## See also
46
47- [RFC 6901](https://datatracker.ietf.org/doc/html/rfc6901)
48
49## Version history
50
51- Added in version 2.0.0.
52- Changed template parameter from `basic_json` to string type in version 3.11.0.
53