# nlohmann::basic_json::operator value_t ```cpp constexpr operator value_t() const noexcept; ``` Return the type of the JSON value as a value from the [`value_t`](value_t.md) enumeration. ## Return value the type of the JSON value | Value type | return value | |---------------------------|----------------------------| | `#!json null` | `value_t::null` | | boolean | `value_t::boolean` | | string | `value_t::string` | | number (integer) | `value_t::number_integer` | | number (unsigned integer) | `value_t::number_unsigned` | | number (floating-point) | `value_t::number_float` | | object | `value_t::object` | | array | `value_t::array` | | binary | `value_t::binary` | | discarded | `value_t::discarded` | ## Exception safety No-throw guarantee: this member function never throws exceptions. ## Complexity Constant. ## Examples ??? example The following code exemplifies `operator value_t()` for all JSON types. ```cpp --8<-- "examples/operator__value_t.cpp" ``` Output: ```json --8<-- "examples/operator__value_t.output" ``` ## Version history - Added in version 1.0.0. - Added unsigned integer type in version 2.0.0. - Added binary type in version 3.8.0.