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WelsonJS
Build apps with the Windows built-in JavaScript engine
Hi everyone,
I’m the creator of WelsonJS.
WelsonJS started from a simple question: Can we build practical Windows applications using just a text editor, without relying on a heavyweight IDE?
The idea was first tested in a real industrial environment in South Korea, where we needed to build a metric collection agent that could run across Windows versions ranging from Windows 2000 servers to Windows 10 PCs.
What started as a practical scripting project gradually grew through real-world requirements from VPN, compliance, information security, asset valuation, live commerce, and other industries.
Today, WelsonJS is an open-source JavaScript runtime for Windows automation and application development. It connects browsers, Microsoft Office, desktop applications, local files, databases, Windows APIs, and external services in a single programmable environment.
More recently, we added MCP support, allowing AI clients and coding agents such as Claude, Codex, and GitHub Copilot to interact with Windows capabilities exposed by WelsonJS.
The idea is simple: AI provides reasoning and planning, MCP provides the connection, and WelsonJS provides the execution layer for the Windows environment.
I’d love to hear what you think about this approach.
If you work with Windows automation, legacy applications, desktop software, AI agents, or MCP, I’d especially like to hear about the problems you are trying to solve.
Thanks for checking out WelsonJS.
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About WelsonJS on Product Hunt
“Build apps with the Windows built-in JavaScript engine”
WelsonJS was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #135 on the daily leaderboard. WelsonJS - Build apps with the Windows built-in JavaScript engine - gnh1201/welsonjs
WelsonJS was featured in Internet of Things (226.7k followers), Developer Tools (519k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 120.5k products, making this a competitive space to launch in.
Who hunted WelsonJS?
WelsonJS was hunted by Namhyeon Go. 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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