WebSandbox Blog

Engineering, insights & updates

Deep dives into the technology powering WebSandbox, product updates from the team, and open-source news.

5 articles publishedEngineering · Security · Performance

/01Engineering

Jun 12, 2026

6 min read

The Hidden IPv6 Trap: Why Dev Servers Throw ECONNREFUSED in Proxies

How a legacy proxy configuration collided with modern Node.js networking, and how the WebSandbox team solved the ECONNREFUSED issue platform-wide.

Ranit Kumar Manik

/02Engineering

May 28, 2026

8 min read

How WebContainers Power WebSandbox: A Deep Dive

WebContainers allow us to run a complete Node.js environment inside your browser tab. Here's how they work, why we chose them, and what we've built on top.

Ranit Kumar Manik

/03Engineering

May 14, 2026

6 min read

Running a Full TypeScript Language Server Inside Your Browser

Getting real TypeScript intelligence — go-to-definition, hover types, error diagnostics — to work in a browser-based IDE is non-trivial. Here's how we did it with Web Workers and LSP.

Ranit Kumar Manik

/04Security

Apr 10, 2026

7 min read

How We Keep Your Code Safe: The WebSandbox Security Model

Running arbitrary user code is inherently risky. Here's the multi-layered security model we've built — from browser sandboxing to CSP headers and network isolation.

Ranit Kumar Manik

/05Performance

Mar 20, 2026

9 min read

WebSandbox Performance in 2026: What We Measured, What We Fixed

We ran a thorough performance audit of the WebSandbox editor. Here are the Core Web Vitals results, the bottlenecks we found, and the optimizations we shipped.

Ranit Kumar Manik