  Third-party package usage has become a common practice in contemporary
software development. Developers often face different challenges, including
choosing the right libraries, installing errors, discrepancies, setting up the
environment, and building failures during software development. The risks of
maintaining a third-party package are well known, but it is unclear how
information from Stack Overflow (SO) can be useful. This paper performed an
empirical study to explore npm co-usage in SO. From over 30,000 SO posts, we
extracted 2,100 SO posts related to npm and matched them to 217,934 npm library
packages. We find that, popular and highly used libraries are not discussed as
often in SO. However, we can see that the accepted answers may prove useful, as
we believe that the usage examples and executable commands could be reused for
tool support.
