Jen.js 16

[oopsio]

Jen.js v16 – Release Notes

Release Date: February 2026

Jen.js v16 introduces four major features and versioned example projects.

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New Features

1. Islands / Partial Hydration

   • Only hydrate interactive components on the client.
   • Strategies: client:load, client:idle, client:visible.
   • Reduces JavaScript sent to the client and improves page load performance.

2. Route Middleware

   • Run code before a page renders (auth, data loading, redirects).
   • Cleanly separate request processing from page rendering.

3. API Routes

   • Define REST endpoints alongside your pages.
   • Supports GET, POST, and dynamic routes.

4. Zero-JS / Static Pages

   • Disable client-side JavaScript for pages that don’t need interactivity.
   • Produces pure HTML for maximum performance and accessibility.

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Examples

• Home page: interactive counter (Islands)
• Interactive page: multiple islands (Counter, Timer, Newsletter)
• Login page: Island + form
• Protected dashboard: middleware + islands
• About & documentation pages: zero-JS static pages
• Blog posts: dynamic routes with zero-JS
• API endpoints: GET /api/hello, GET/POST /api/users

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All features are fully integrated with the dev server and production builds.
Ready for use in production.

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This discussion was created from the release Jen.js 16.