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Kyushu
Self-hostable JavaScript workers. No Node, Bun or Docker.
Kyushu is a self-hostable Wasm sandbox for JavaScript workers. Think Cloudflare Workers, but on your own VPS. Write a JS fetch handler, ship it as a standalone binary, and run it on your server. Use cases could be running untrusted code safely, building edge-like handlers on your infra, or giving AI agents a sandboxed environment to execute logic. Open source. Early stage. Give it a try and upvote if you ❤️ it!
Hey PH! 👋 I'm David.
I built Kyushu because, why not 😜
More seriously, it grew out of my experience building juno.build, a platform where apps run in some sort of containers. I also built an API with Bun that runs on a VPS. So, needless to say, I like running my own sandboxes.
When I recently tried Cloudflare Workers to build my "blog to newsletter" action pipeline (GitHub + Claude + Mailchimp + Telegram), something clicked: a single function, sandboxed, stateless, handling HTTP... maybe there is something to experiment here?
Plus, I find it fun to try to avoid using Node or Bun to run JavaScript. Long story short, felt like it was worth experimenting.
And spoiler alert: it worked out 😄
Looking forward to your feedback and questions. Happy to answer anything in the comments or review any PRs!
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About Kyushu on Product Hunt
“Self-hostable JavaScript workers. No Node, Bun or Docker.”
Kyushu was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #151 on the daily leaderboard. Kyushu is a self-hostable Wasm sandbox for JavaScript workers. Think Cloudflare Workers, but on your own VPS. Write a JS fetch handler, ship it as a standalone binary, and run it on your server. Use cases could be running untrusted code safely, building edge-like handlers on your infra, or giving AI agents a sandboxed environment to execute logic. Open source. Early stage. Give it a try and upvote if you ❤️ it!
Kyushu was featured in Open Source (68.5k followers), Developer Tools (514k followers), GitHub (41.3k followers) and Side Project (5.4k followers) on Product Hunt. Together, these topics include over 109.4k products, making this a competitive space to launch in.
Who hunted Kyushu?
Kyushu was hunted by David Dal Busco. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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David Dal Busco