How to Use Templates in Rust (Tera, Askama)

Use the askama crate to compile templates at build time and render them with Rust structs. Add askama and askama_derive to your dependencies, define a struct matching your template data, and implement the Template trait using the #[template] attribute. Then, call .render() on your struct instance to get the final string.

use askama::Template;

#[derive(Template)]
#[template(path = "hello.html")]
struct Greeting<'a> {
    name: &'a str,
}

fn main() {
    let greeting = Greeting { name: "World" };
    println!("{}", greeting.render().unwrap());
}

Create a hello.html file in your templates directory with content like Hello, {{ name }}!.

Templates let you write HTML with placeholders that get filled in by your Rust code. You define a data structure in Rust and a matching HTML file, then the compiler combines them to generate fast, type-safe code. It's like using a mail-merge feature in a word processor, but the merging happens when you build your program, not when you run it.