Running your code

How execution works

Your code runs inside a dedicated Docker container on our servers. You never need to install anything locally — every dependency runs on Linux in the cloud.

Starting your app

Using the Run button

Click the ▶ Run button in the toolbar. Spinini detects your project type and runs the appropriate start command:

Using the terminal

Open the terminal (Ctrl + `) and run any command you like:

node server.js
npm run dev
python app.py
flask run --port 5000

Viewing output

Standard output and stderr from your process appear in the terminal pane in real time. Errors are highlighted in red.

If your app starts an HTTP server, the preview pane on the right will automatically connect to it and show your running application.

Stopping a running process

Press Ctrl+C in the terminal to send SIGINT to the running process — same as on your local machine.

Installing packages

Your container has npm, pip, apt, and cargo available. Install anything you need:

npm install express
pip install flask requests
apt-get install -y imagemagick

Installed packages persist for the life of the container. If you restart the container they'll need to be reinstalled — add them to package.json or requirements.txt so they install automatically.

Tip: Use Spinini AI to scaffold your entire app in one shot — it writes files, installs packages, and starts your server automatically.