Templ

Templ is a generic term used in software development to refer to a family of templating languages and tools designed to generate text by combining static templates with dynamic data. It is not a single standardized language; multiple implementations share common goals, such as separating content from presentation, enabling reuse, and producing outputs like HTML pages, emails, configuration files, or source code.

A templating system typically defines templates containing placeholders or expressions and a rendering engine that substitutes those placeholders with values supplied at runtime. Common features include variable substitution, conditionals, loops, and the ability to compose templates from blocks or partials. Many templating languages also provide escaping mechanisms to prevent injection attacks, and helpers or filters to transform data during rendering.

Templ languages vary in syntax and embedding approach. Some use HTML-like templates with embedded tags, others resemble Mustache, Jinja, or Liquid, while some are domain-specific and tightly integrated with a host language. Templ engines can run in various contexts, including web servers, command-line tools, and build pipelines, and may render templates on demand or generate static outputs. Performance considerations include template compilation, caching, and streaming rendering for large outputs.

In practice, templ is widely used for web page rendering, document generation, and scaffolding of repetitive code or configuration files. See also templating languages such as Mustache, Jinja, Twig, and Handlebars.