From interactive tutorials to full-blown IDEs, build instant, interactive coding experiences backed by WebContainers: the trusted, browser-based runtime from StackBlitz. Run Node.js in your browser with unmatched speed and no remote VMs involved.
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The WebContainer API enables full Node.js dev environments to run directly in the browser, making it significantly faster and more interactive than traditional cloud-based setups. Unlike remote VMs or containers that require server infrastructure and load times, WebContainers launch instantly, run entirely client-side, and offer a secure, sandboxed experience. This makes them ideal for fast prototyping, interactive docs, and onboarding—without the latency, complexity, or backend dependencies of conventional alternatives.
Otto runs entirely in the browser in an isolated environment with zero setup required thanks to web containers!