JS Brain Teasers

What it does

Master asynchronous JavaScript through interactive challenges. Learn promises, async/await, and event loop concepts with hands-on practice. Get real-time feedback and join our community of developers mastering modern JavaScript.

Interactive JavaScript challenges perfect for beginners, developers, and non-tech professionals. Mobile-friendly, totally free, and you can start without creating an account.

No downloads, no complex setup, no credit card required. Start learning JavaScript right in your browser! Perfect for beginners, curious minds, and anyone who wants to understand programming without the hassle. Interactive challenges that make JavaScript concepts click, whether you're a complete beginner or looking to fill knowledge gaps. Take your learning on the go! Our mobile-optimized interface lets you practice JavaScript challenges during your commute, lunch break, or whenever you have a spare moment. Mobile-friendly interface perfect for learning on the go. Practice JavaScript concepts on your phone during commutes, breaks, or anywhere you have a few minutes Start from the basics and…from jsbrainteasers.com

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  Learn and practice modern JavaScript2019 · learnjavascript.online · ▲305

  Learn JavaScript is the easiest, most interactive way to learn & practice modern JavaScript online. Read short lessons, solve challenges & answer flashcards.

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  JavaScript Quiz2021 · javascriptquiz.com · ▲190

  Check your JS knowledge by having fun.

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  Master async JavaScript with interactive visualization

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  Mastering Async JavaScript - learn async JS through live examples2018 · frontarm.com · ▲8

  Over the course of 47 live examples and exercises, you

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  JS VisualizerMay 2026 · jsvisualizer.bytefront.dev · ▲4

  Finally understand the JS event loop

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  Evented Mind - Javascript and Meteor classes2015 · ▲55

  Evented Mind offers in-depth, on demand video classes on JS

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  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

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  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

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  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

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  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 21d ago · talanoa.email

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  One MCP for everything your agents need: apps, memory, tools

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  YouMind▲1,223

  The first AI creation studio where learning meets writing

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  The site hit #1 on HN about a year ago. Got enough traffic that I turned it into a proper API. What's there: - REST API — 35k products, manually filterable by category, free key, 60 req/min - CLI — npx anycrap random -c food - faker.js plugin — bundled, no API call, works offline - HuggingFace dataset — full 35k rows for ML/training https://anycrap.shop/developers

  AI · 2025 · anycrap.shop

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  Term.everything – Run any GUI app in the terminal▲1,094

  I made a built-from scratch Wayland Compositor to display any GUI app* in the terminal! I think there is a lot of unexplored potential in custom Wayland compositors, a lot of really cool things you can embed existing applications into! So, I started with embedding apps into the terminal because that is the easiest input/output (output is just utf-8 and I use the great `chafa` library for that, and I just read from stdin for the input). If you have any other ideas for cool Wayland compositors, let me know. I purposedly wrote 80% the app in Typescript to appeal to the most developers and…

  Dev tools · 2025 · github.com

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  Years ago I stumbled across a basic version of this concept and it stuck with me. I knew if I was ever going to take on such a project, it would need to be flawless, but without coding experience it was just another idea that would never happen. By the end of 2024, as AI coding tools exploded everywhere, I finally had a way to make it real. I started from zero knowledge and spent months collaborating with AI agents as a learning experience. Every pixel and every function went through me. The AI translated what I asked for into code, but every decision was human. I didn't use existing OS…

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