  Over the past few decades, a vast amount of information on the structure of
atomic nuclei has been collected, compiled, and evaluated. Accurate and
reliable data are essential for the understanding of the behavior of atomic
nuclei. Accessing and utilizing these data, spread among different databases,
has remained challenging for many researchers due to the complexity and
diversity of data formats. This article presents the Toolkit for Nuclei (TkN)
C++ open-source library that provides easy access to nuclear structure data.
This library is intended to be used in theoretical models, data analysis
software or simulation codes. It utilizes a comprehensive database built from
different official sources and frequently updated. The user interface allows to
easily access and search for nuclear structure data and TkN can be compiled
without any dependencies, facilitating its incorporation into various research
projects.
