Node.js AdvancedLesson 90Free preview

Node WebAssembly

This lesson is part of Node.js · All levels

Summary

This lesson introduces WebAssembly (Wasm) in the Node.js environment: running high-form binary modules compiled from languages such as C/C++ and Rust. Node.js can load .wasm modules through fs and the built-in WebAssembly API. It's useful for speeding up heavy computing or using old C-based libraries.

Key points

WebAssembly is a binary instruction executed by a JavaScript virtual machine.
In Node.js a global WebAssembly (instantiate, compile) is available without additional libraries.
The .wasm module can be loaded from a file with fs.readFileSync and then WebAssembly.instantiate(bytes, imports).
Wasm runs sandboxed and has no direct access to the file/network without imports.
Use cases: CPU-intensive algorithms, C/C++ library porting, and cryptography.

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