Documentation

Recode guides and reference

Getting started

Open the Dashboard and create a project from a template.
Edit files in the Monaco editor workspace.
Press Run to execute Python or refresh web previews.
View output in Console, preview in the Preview panel.
Enable Guided Mode for inline documentation hints.

Storage

Projects are stored in IndexedDB via Dexie. Data persists across browser sessions on the same device. Cloud sync and self-hosting are planned for future releases.

Python runtime

Python runs via Pyodide in the browser. The runtime lazy-loads on first Run — it is not loaded on the landing page or dashboard.

input() is supported through a Console prompt. Errors include Guided Mode explanations when enabled.

Web preview

HTML/CSS/JS projects render in a sandboxed iframe. JavaScript console.log output is captured into the Recode Console.

Shell

The Shell panel provides terminal UI. Production shell execution requires sandbox isolation and is planned for a future release. No raw server command execution occurs in this version.

Language support

Language	Run	Editor	Status
Python	Browser runtime	Strong	Runs in browser
HTML	Preview	Strong	Preview ready
CSS	Preview	Strong	Preview ready
JavaScript	Preview / Console	Strong	Runs in browser
TypeScript	Editor	Strong	Editor only
React	Requires sandbox	Strong	Sandbox required
Next.js	Requires sandbox	Strong	Sandbox required
Node.js	Requires sandbox	Strong	Sandbox required
Markdown	Preview	Strong	Preview ready
JSON	Preview	Strong	Preview ready
Java	Sandbox required	Syntax	Sandbox required
C	Sandbox required	Syntax	Sandbox required
C++	Sandbox required	Syntax	Sandbox required
C#	Sandbox required	Syntax	Sandbox required
PHP	Sandbox required	Syntax	Sandbox required
Ruby	Sandbox required	Syntax	Sandbox required
Go	Sandbox required	Syntax	Sandbox required
Rust	Sandbox required	Syntax	Sandbox required
SQL	Runner planned	Syntax	Editor only
Kotlin	Sandbox required	Syntax	Sandbox required
Swift	Sandbox required	Syntax	Sandbox required
Shell	Sandbox required	Syntax	Sandbox required
YAML	Editor	Syntax	Editor only
TOML	Editor	Syntax	Editor only

Security

See SECURITY.md and docs/runtime-sandboxing.md in the repository for sandboxing policies. User code never executes on an unsandboxed server in this version.