1# <small>nlohmann::basic_json::</small>type_error 2 3```cpp 4class type_error : public exception; 5``` 6 7This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type 8does not match the expected semantics. 9 10Exceptions have ids 3xx (see [list of type errors](../../home/exceptions.md#type-errors)). 11 12```plantuml 13std::exception <|-- basic_json::exception 14basic_json::exception <|-- basic_json::parse_error 15basic_json::exception <|-- basic_json::invalid_iterator 16basic_json::exception <|-- basic_json::type_error 17basic_json::exception <|-- basic_json::out_of_range 18basic_json::exception <|-- basic_json::other_error 19 20interface std::exception {} 21 22class basic_json::exception { 23 + const int id 24 + const char* what() const 25} 26 27class basic_json::parse_error { 28 + const std::size_t byte 29} 30 31class basic_json::type_error #FFFF00 {} 32``` 33 34## Member functions 35 36- **what** - returns explanatory string 37 38## Member variables 39 40- **id** - the id of the exception 41 42## Examples 43 44??? example 45 46 The following code shows how a `type_error` exception can be caught. 47 48 ```cpp 49 --8<-- "examples/type_error.cpp" 50 ``` 51 52 Output: 53 54 ```json 55 --8<-- "examples/type_error.output" 56 ``` 57 58## See also 59 60- [List of type errors](../../home/exceptions.md#type-errors) 61- [`parse_error`](parse_error.md) for exceptions indicating a parse error 62- [`invalid_iterator`](invalid_iterator.md) for exceptions indicating errors with iterators 63- [`out_of_range`](out_of_range.md) for exceptions indicating access out of the defined range 64- [`other_error`](other_error.md) for exceptions indicating other library errors 65 66## Version history 67 68- Since version 3.0.0. 69