Open-source LLM-friendly web crawler and scraper

JavaScript API for Chrome and Firefox

React and Next.js performance guidance for writing, reviewing, and refactoring production UI code.

A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go / Java

Data Apps & Dashboards for Python. No JavaScript Required.

Crawlee—A web scraping and browser automation library for Node.js to build reliable crawlers. In JavaScript and TypeScript. Extract data for AI, LLMs, RAG, or GPTs. Download HTML, PDF, JPG, PNG, and other files from websites. Works with Puppeteer, Playwright, Cheerio, JSDOM, and raw HTTP. Both headful and headless mode. With proxy rotation.

Reviews animation and motion code against a high craft bar derived from Emil Kowalski's design engineering philosophy. Default to flagging; approval is earned.

A WebGL accelerated JavaScript library for training and deploying ML models.

This skill encodes Emil Kowalski's philosophy on UI polish, component design, animation decisions, and the invisible details that make software feel great.

Open-source JavaScript charting library behind Plotly and Dash

An open-source JavaScript library for world-class 3D globes and maps :earth_americas:

📊 Interactive JavaScript Charts built on SVG