1# <small>nlohmann::json_pointer::</small>back 2 3```cpp 4const string_t& back() const; 5``` 6 7Return last reference token. 8 9## Return value 10 11Last reference token. 12 13## Exceptions 14 15Throws [out_of_range.405](../../home/exceptions.md#jsonexceptionout_of_range405) if JSON pointer has no parent. 16 17## Complexity 18 19Constant. 20 21## Examples 22 23??? example 24 25 The example shows the usage of `back`. 26 27 ```cpp 28 --8<-- "examples/json_pointer__back.cpp" 29 ``` 30 31 Output: 32 33 ```json 34 --8<-- "examples/json_pointer__back.output" 35 ``` 36 37## Version history 38 39- Added in version 3.6.0. 40- Changed return type to `string_t` in version 3.11.0. 41