1# <small>nlohmann::json_pointer::</small>json_pointer 2 3```cpp 4explicit json_pointer(const string_t& s = ""); 5``` 6 7Create a JSON pointer according to the syntax described in 8[Section 3 of RFC6901](https://tools.ietf.org/html/rfc6901#section-3). 9 10## Parameters 11 12`s` (in) 13: string representing the JSON pointer; if omitted, the empty string is assumed which references the whole JSON value 14 15## Exceptions 16 17- Throws [parse_error.107](../../home/exceptions.md#jsonexceptionparse_error107) if the given JSON pointer `s` is 18 nonempty and does not begin with a slash (`/`); see example below. 19- Throws [parse_error.108](../../home/exceptions.md#jsonexceptionparse_error108) if a tilde (`~`) in the given JSON 20 pointer `s` is not followed by `0` (representing `~`) or `1` (representing `/`); see example below. 21 22## Examples 23 24??? example 25 26 The example shows the construction several valid JSON pointers as well as the exceptional behavior. 27 28 ```cpp 29 --8<-- "examples/json_pointer.cpp" 30 ``` 31 32 Output: 33 34 ```json 35 --8<-- "examples/json_pointer.output" 36 ``` 37 38## Version history 39 40- Added in version 2.0.0. 41- Changed type of `s` to `string_t` in version 3.11.0. 42