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@fast-scrape/wasm

v0.2.0

Published

WebAssembly bindings for scrape-rs HTML parsing library

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@fast-scrape/wasm

npm Bundle Size TypeScript License

10-50x faster HTML parsing in the browser. Native-speed parsing via WebAssembly.

Installation

npm install @fast-scrape/wasm
yarn add @fast-scrape/wasm
pnpm add @fast-scrape/wasm
bun add @fast-scrape/wasm

Quick start

import init, { Soup } from '@fast-scrape/wasm';

await init();  // Initialize WASM module (once)

const soup = new Soup("<html><body><div class='content'>Hello, World!</div></body></html>");
console.log(soup.find("div").text);  // Hello, World!

[!IMPORTANT] Call init() once before using any other functions.

Usage

import init, { Soup } from '@fast-scrape/wasm';

await init();

const soup = new Soup(html);

// Find first element by tag
const div = soup.find("div");

// Find all elements
const divs = soup.findAll("div");

// CSS selectors
for (const el of soup.select("div.content > p")) {
    console.log(el.text);
}

Vite:

import init, { Soup } from '@fast-scrape/wasm';
await init();  // Vite handles WASM automatically

Webpack 5:

// webpack.config.js
module.exports = {
    experiments: { asyncWebAssembly: true },
};
<script type="module">
import init, { Soup } from 'https://esm.sh/@fast-scrape/wasm';

await init();
const soup = new Soup('<div>Hello</div>');
console.log(soup.find('div').text);
</script>
import init, { Soup, Tag } from '@fast-scrape/wasm';

await init();

function extractLinks(soup: Soup): string[] {
    return soup.select("a[href]").map(a => a.getAttribute("href") ?? "");
}

Bundle size

v0.2.0 optimization brings package to under 500 KB:

| Build | Size | |-------|------| | Minified + gzip | ~150 KB | | Minified | ~400 KB |

[!TIP] SIMD enabled automatically on Chrome 91+, Firefox 89+, Safari 16.4+. v0.2.0 includes zero-copy serialization for 50-70% memory savings in HTML extraction.

Browser support

| Browser | Version | SIMD | |---------|---------|------| | Chrome | 80+ | 91+ | | Firefox | 75+ | 89+ | | Safari | 13+ | 16.4+ | | Edge | 80+ | 91+ |

Built on Servo

Powered by battle-tested libraries from the Servo browser engine: html5ever (HTML5 parser) and selectors (CSS selector engine).

Related packages

| Platform | Package | |----------|---------| | Rust | scrape-core | | Python | fast-scrape | | Node.js | @fast-scrape/node |

License

MIT OR Apache-2.0