Using WebAssembly in Node.js CLI Tools for 100x Performance

Using WebAssembly in Node.js CLI Tools for 100x Performance Some operations in CLI tools are inherently slow in JavaScript: parsing large binary files, image processing, cryptographic hashing, or running complex algorithms. You can reach for native C++ addons, but they break on different platforms and require compiler toolchains. WebAssembly offers a middle path: near-native performance, runs everywhere Node.js runs, no compilation step for users. This article shows how to use Wasm modules in CLI tools for the operations where JavaScript is too slow. When Wasm Makes Sense Wasm is worth the complexity when: CPU-bound operations dominate runtime (not I/O-bound) Performance matters — 10x+ improvement needed, not 10% Cross-platform is required — no native compilation for users Existing C/Rust code can be compiled to Wasm Don't use Wasm for: file I/O, network requests, string manipulation, JSON parsing — JavaScript is already fast enough. Loading Wasm in Node.js import { readFile } from ' n