fson installs one executable, fson-check, plus its shell completion scripts. Both land in the Runtime package component, so they are present wherever the library is installed.

• fson-check — reads an FSON file, reports every diagnostic on stderr as file:line:col: severity: message, and then either pretty-prints it, rewrites it in place, or converts it to strict JSON or JSON5.
• Shell completion — Bash and Zsh tab-completion for fson-check's options.

There is no build step: cmake --install (or the Conan package, or any CPack archive) places the binary on PATH and the completion files where the shells look for them.