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Flask includes a built-in development server so you can run your app instantly while building, with no extra setup. 🛠️

The recommended way to launch is the flask run command, which finds your app and serves it on the local port.

Set the FLASK_APP variable so the command knows which file holds your application object.

By default the server listens on 127.0.0.1:5000, reachable only from your own machine while you develop.

Debug mode unlocks two big helpers: a live reloader and a rich error page. Enable it while developing only.

With debug on, the reloader watches your files and restarts the server whenever you save a change. No manual restarts. ♻️

When code crashes, debug mode shows a detailed traceback in the browser so you can pinpoint the failing line fast.

You can also flip debug on inside app.run, handy when you launch the file directly with python.

The console prints a line each time it reloads, confirming your edits were picked up and the server is fresh.

The debugger can run arbitrary code, so it is a serious security risk. Keep debug mode off on any public server.

Press Ctrl+C in the terminal to shut the dev server down cleanly when you are finished working.

Quick check on what debug mode gives you.

You ran the dev server with flask run, enabled debug for the reloader and debugger, and learned to keep it off in production. 🔒