# nlohmann::basic_json::clear ```cpp void clear() noexcept; ``` Clears the content of a JSON value and resets it to the default value as if [`basic_json(value_t)`](basic_json.md) would have been called with the current value type from [`type()`](type.md): | Value type | initial value | |------------|----------------------| | null | `null` | | boolean | `false` | | string | `""` | | number | `0` | | binary | An empty byte vector | | object | `{}` | | array | `[]` | Has the same effect as calling ```.cpp *this = basic_json(type()); ``` ## Exception safety No-throw guarantee: this function never throws exceptions. ## Complexity Linear in the size of the JSON value. ## Notes All iterators, pointers, and references related to this container are invalidated. ## Examples ??? example The example below shows the effect of `clear()` to different JSON types. ```cpp --8<-- "examples/clear.cpp" ``` Output: ```json --8<-- "examples/clear.output" ``` ## Version history - Added in version 1.0.0. - Added support for binary types in version 3.8.0.