After a full 1.4 years of work, v4 is ready for developers, AI builders, and teams shipping SaaS products on Node.js.
ExpressoTS gives you a solid backend foundation: DI, interceptors, typed events, guards, testing utilities, and a lightweight core engine designed to keep services structured, maintainable, and production ready.
It works for experienced developers who want clean architecture, but also for founders and builders using AI to create products and businesses without ending up with a pile of fragile routes.
The headline feature is ExpressoTS Studio: a local developer platform that records every request, maps your architecture from the live DI graph, replays traffic, and scores security from real dev traffic. Nothing leaves your machine.
If you use AI to move fast, Studio is how you see what you shipped before production does.
Try it: npx @expressots/cli@next new my-new-saas-idea
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