What Debugging JavaScript on WebAssembly Looks Like

WebAssembly debugging has advanced significantly from 2024 to 2025, surpassing earlier limitations. While browser-based Wasm debugging via Emscripten is effective, backend debugging has been more challenging. Recent developments integrate SpiderMonkey engine with VS Code, enabling JavaScript debugging in WebAssembly using components.as.js for bindings and socket connections for remote debugging. This approach avoids direct bytecode inspection and allows post-deployment debugging without redeployment. Future goals include creating a unified debugging experience across multiple languages and components.