Jinja2 is a Python templating engine that can be used to build dynamic, reusable LLM prompt templates. The post covers core Jinja2 syntax including variable interpolation with double curly braces, control structures like conditionals and loops, template inheritance with the extends keyword, and macros for reusable components. It then demonstrates assembling a complex medical diagnosis prompt using these features. Key advantages of Jinja2 for prompting include keeping business logic inside the prompt CMS rather than the codebase, its simplicity and broad text-format support, and its lightweight performance for high-volume LLM calls.
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