log_init: Initialize logging to JavaScript console
In shinyEventLogger: Logging Events in Shiny Apps

log_init should be put into the shiny ui to initialize JavaScript code that enables logging to JavaScript console in an Internet browser.

1	log_init()

A tagList with script tag inside head tag.

if (interactive()) {
  set_logging(js_console = TRUE)
  shiny::shinyApp(
    ui = shiny::fluidPage(log_init()),
    server = function(input, output) {
      set_logging_session()
      log_event("See browser JavaScript console (CTRL + SHIFT + I)")
    }
  )
}