Matt Holden

duckdb-wasm-kit. Hooks and utilities to make it easier to use duckdb-wasm in React apps.

openai-zod-functions. OpenAI Function Calling in Typescript using Zod

hello-llama. A simple chat bot to play with Llama 3.1

flask-boilerplate. Boilerplate for a Python Flask application, including asset packaging (using Flask-Assets) and common libraries (Backbone, Bootstrap, etc). Easily deploy to Heroku.

use-pyodide. React hook to run pyodide in a web worker

spectree-v1. A simple format for composable Markdown trees using `@` references

llm-message-utils. Simple Typescript tagged template literals to make LLM messages easier to work with

spectree. A markdown preprocessor for composable instructions

Backtester.io. Backtest investment allocations against historical data.

openai-message-utils. Simple Typescript library that makes OpenAI messages easier to work with

ts-utils. Simple Typescript utilities

AdTemplates. Two mobile ad templates: adhesion banner and carousel.

Chromebox. A Chrome extension to search your Dropbox files from the Chrome search box.

MandelMap. Navigate the Mandelbrot set as easily as Google Maps.

holden-start. My opinionated starter for new web projects in 2025