All ROS 2 package's documentation is hosted alongside its information on the ROS Index.
Searching for packages will yield their information such as released distributions, README.md files, URLs, and other important metadata.
A list of all packages for each distribution on the index can be found here.
From the right-hand side of a package of interest, the auto-generated API documentation may be found found using the "API Docs" button.
You can find the API Documentation for the Client Libraries in the {DISTRO_TITLE} distribution using the links below:
- rclcpp - C++ client library
- rclcpp_lifecycle - C++ lifecycle library
- rclcpp_components - C++ components library
- rclcpp_action - C++ actions library
A raw list of {DISTRO_TITLE} package documentation may be found here.