I built an extension of JavaScript in a day

In plain words

This project is a JavaScript extension created in a single day. It's designed for developers who want to experiment with extended JavaScript functionality. The work is available on GitHub for those interested in exploring custom language modifications or learning how quickly a language extension can be built.

written from the facts on this page · September 2026

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  I made a CLI tool to create web extensions with no build configuration2024 · github.com · ▲381

  Hello HN! I'm the creator and solo developer of Extension.js, a development tool for browser extensions with built-in support for TypeScript, WebAssembly, React, and modern JavaScript. Developers use it to spend less time configuring the compilation config or learning new frameworks and more time actually writing code. Most projects similar to Extension.js rely on some sort of abstraction or configuration to get started, making the initial development process slow given the extra learning curve and setup guidelines. By using Extension.js, adding the package to your npm scripts is all it…

• IT
  I taught my little brother JS, and he made this videogame in a week2019 · s-poony.github.io · ▲1,079
• 
  Web.dev by Google2018 · web.dev · ▲815

  Learn how to build for the web and see where you stand 🌟

• 
  Fast.js – faster reimplementations of native JavaScript functions2014 · github.com · ▲323

  Faster user-land reimplementations for several common builtin native JavaScript functions. - codemix/fast.js

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  1 KB JavaScript library for building front end apps2017 · github.com · ▲242

  1kB-ish JavaScript framework for building hypertext applications - hyperapp/hyperapp

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  Daily2017 · daily.dev · ▲134

  Delivers the best development articles to your New Tab

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  SimCity, but with Permits▲929

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 2d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 14d ago · tanzaniaeducationproject.org

• 
  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 15d ago · bigwords.page

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 9d ago · guitoro.com

• 
  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 13d ago · carrierexplode.com

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  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 23d ago · space.bl2.net

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  Product Hunt for iOS▲1,402

  The best new products, every day, in your pocket

  Life & fun · 2014

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  I got hacked, felt paranoid, made an app – GlassWire▲1,013

  GlassWire is a modern personal firewall and network monitor with over 54 million downloads. Download GlassWire free!

  Life & fun · 2014 · glasswire.com

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  Hyperlapse▲820

  Create amazing time lapse videos (by Instagram)

  Life & fun · 2014 · instagram.com

• PG
  Put “GIF” in front of any YouTube URL and hit enter▲577

  Life & fun · 2014 · gifyoutube.com

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  Product Hunt API (beta)▲508

  Make stuff with us. Signup for early access to the PH API :)

  Dev tools · 2014

• 
  Mailbox for Mac (Beta)▲490

  Fly through your email. Now on Mac

  Growth · 2014 · theverge.com