# basic_json::boolean_t ```cpp using boolean_t = BooleanType; ``` The type used to store JSON booleans. [RFC 7159](http://rfc7159.net/rfc7159) implicitly describes a boolean as a type which differentiates the two literals `#!json true` and `#!json false`. To store objects in C++, a type is defined by the template parameter `BooleanType` which chooses the type to use. ## Notes #### Default type With the default values for `BooleanType` (`#!cpp bool`), the default value for `boolean_t` is `#!cpp bool`. #### Storage Boolean values are stored directly inside a `basic_json` type. ## Version history - Added in version 1.0.0.