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Fireemu

Emulator UI

fireemu up serves the Emulator UI at http://127.0.0.1:4000.

Terminal window
# Another port
npx fireemu up --ui-port 4001


# No UI
npx fireemu up --ui-port 0


# exec starts no UI unless asked
npx fireemu exec --ui -- npm test

If the default port is busy, up starts without the UI; check the startup output.

What it shows

Section titled “What it shows”
  • Overview: the project, version, virtual clock and running services.
  • Authentication, Firestore and Storage: browse and manage users, documents and objects.
  • Functions: registered functions, their triggers, invocation results and logs. Run a scheduled function immediately, or advance the clock to its next occurrence.
  • Alerts: publish Firebase alerts to functions that listen for them.
  • Rules: every Security Rules decision since the start of the run, with what each expression evaluated to.
  • App Check: registered apps and debug tokens.
  • Runtime: the virtual clock. Move it forward, or backwards with Allow moving backwards.