Build
Dev mode
Edit code directly in the browser — Monaco editor with IntelliSense, file tree, integrated terminal preview. No installation.
Overview
Dev mode opens a full-featured editor next to the preview. Save is instant — the preview rebuilds.
Dev mode is free — it does not charge credits.
What Dev mode can do
- Monaco editor with TypeScript IntelliSense
- File tree, opening multiple files in tabs
- Search across project (Ctrl+Shift+F)
- Console / network requests preview
- Format on save (Prettier)
When to use Dev mode
- Minor text or number adjustment where you don't want to waste credit.
- Check what the agent generated.
- Debugging a detail that the agent doesn't fix the first time.