With the rise of autonomous AI agents and code-interpreting LLM features, Node.js backends are increasingly required to execute code generated on the fly. However, running arbitrary user or AI code inside a Node.js process is dangerous. A single malicious or hallucinated script can read environment variables ( process.env ), spawn OS processes ( child_process ), freeze the event loop with infinite loops, or crash your entire server by exhausting heap memory. In this post, we’ll analyze th...