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cpp-on-the-web

Compile C and C++ code to WebAssembly with Emscripten for browser execution.

926|71|Updated Jan 27, 2026
Search Tags:#wasm#webassembly#cpp#emscripten#library porting#browser development
One-click install
npx skills add https://github.com/GoogleChrome/modern-web-guidance-src --skill cpp-on-the-web
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: cpp-on-the-web
Source: https://github.com/GoogleChrome/modern-web-guidance-src/tree/main/skills-src/cpp-on-the-web
Command: npx skills add https://github.com/GoogleChrome/modern-web-guidance-src --skill cpp-on-the-web

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) and assets (resource) components.

What problem does it solve?

This Skill solves the common challenge of getting C and C++ code to run efficiently in modern web browsers, eliminating the steep learning curve of Emscripten configuration, build flag selection, and browser-specific compatibility pitfalls.

Core Features & Use Cases

  • Emscripten Setup & Build Guidance: Step-by-step instructions for installing the Emscripten SDK, selecting recommended compilation flags for modern ES6 module output, and optimizing build size and performance for web deployment.
  • JS/C++ Interop Best Practices: Guidance for using Embind for safe, class-based interoperability between C++ and JavaScript, plus support for async C++ execution via Asyncify or JSPI when calling JavaScript functions from C++.
  • Library Porting Workflows: Detailed instructions for porting existing C/C++ libraries to the web using standard build systems (CMake, autoconf) or Docker for cross-platform builds, including handling common constraints like browser file I/O, threading, and networking.
  • Use Case Example: Use this Skill to port a C++ image processing library to run directly in the browser for client-side photo editing, avoiding the need to rewrite the entire library in JavaScript.

Quick Start

Use the cpp-on-the-web skill to compile your C++ project to a modern ES6 WebAssembly module with optimized flags and Embind interop for browser use.

Frequently Asked Questions about cpp-on-the-web

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I compile C++ code to WebAssembly for browser execution?▼

Compile C++ code to WebAssembly for browser execution by using the Emscripten toolchain to generate optimized ES6 modules. This Skill guides you through selecting compilation flags and configuring builds for modern web deployment.

What's the best way to port an existing C++ library to a web app?▼

Port an existing C++ library to a web app by compiling it to WebAssembly using Emscripten with standard build systems like CMake. This allows you to run C++ logic directly in the browser without rewriting it in JavaScript.

Can I use CMake to build C++ projects for WebAssembly?▼

Yes, you can use CMake to build C++ projects for WebAssembly. The Skill provides detailed workflows for porting existing libraries using standard build systems like CMake and autoconf, alongside Docker for cross-platform builds.

How do browser-specific constraints like file I/O affect C++ WebAssembly modules?▼

Browser-specific constraints like file I/O affect C++ WebAssembly modules by requiring virtual file systems for standard operations. The Skill addresses handling these constraints, along with threading and WebSocket networking limitations.

Does Emscripten support ES6 module output for WebAssembly builds?▼

Yes, Emscripten supports ES6 module output for WebAssembly builds. The Skill provides step-by-step instructions for selecting recommended compilation flags to generate modern ES6 modules optimized for size and performance.

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