HMPL (pronounced “Hample”) is a small, server-oriented template language that lets developers render dynamic user interfaces by embedding fetch-driven UI blocks directly in HTML.

It bridges the gap between simple server-rendered HTML and heavier client frameworks by enabling interactive content without large JavaScript bundles.

HMPL is syntactically object-based, integrates JSON5 and DOMPurify for safety and flexibility, and can be used directly in HTML or as part of build systems like Vite or Webpack.

Key features include:

• HTML-centric templating with server-fetched UI components
• Integration with modern build tools (Vite, Webpack)
• Optional use without heavy JavaScript frameworks
• Support for .hmpl file extensions with tooling
• Safety via DOMPurify sanitization and JSON5 support

Common use cases include lightweight interactive web pages, dynamic server-fetched components, and apps that want the simplicity of HTML with the flexibility of modern UI without full framework overhead.

HMPL is developed as an open-source project with documentation, starter templates, and tooling support.