handlebars-rust
A Rust implementation of the Handlebars templating language for server-side and WebAssembly rendering.
What is handlebars-rust?
handlebars-rust is a Rust library that implements the Handlebars templating language, allowing developers to render dynamic content from templates within Rust applications. It solves the problem of generating HTML, text, or other output with a clean separation between logic and presentation, commonly used in web servers, static site generators, and configuration management.
Rust developers building web applications, static site generators, or tools that require dynamic text generation, especially those familiar with Handlebars syntax or seeking a templating solution with WebAssembly compatibility.
Developers choose handlebars-rust for its faithful implementation of Handlebars, extensibility through custom helpers and scripting, and performance in Rust environments, including WebAssembly support for client-side rendering.
Overview
Rust templating with Handlebars
Use Cases
Best For
- Rendering HTML templates in Rust web frameworks like Actix, Axum, or Rocket
- Building static site generators with Rust for blog or documentation sites
- Generating configuration files or reports from structured data in Rust applications
- Creating WebAssembly-based templating for browser applications
- Developing tools that require dynamic text generation with template inheritance
- Prototyping web applications with auto-reloading templates in development mode
Not Ideal For
- Projects requiring compile-time template checking for maximum performance and safety
- Teams deeply invested in JavaScript Handlebars helpers without resources to rewrite them in Rust
- Applications needing complex, logic-heavy templates beyond Handlebars' limited control structures
- Rust-native web frameworks preferring integrated, zero-dependency templating solutions
Pros & Cons
Pros
Fully implements standard Handlebars syntax, ensuring compatibility with existing templates and easing migration from JavaScript ecosystems.
Supports custom helpers via Rust functions, macros, or Rhai scripting (with script_helper feature), enabling reusable logic without cluttering templates.
Offers partials and layout inheritance, as demonstrated in examples like partials.rs, promoting DRY design for complex templates.
Auto-reloads templates from disk in dev_mode for rapid iteration, speeding up template development without server restarts.
Can be compiled to WebAssembly, allowing templating in browser-based Rust applications, with a live playground for testing.
Cons
The script_helper feature with Rhai is explicitly noted as 'early stage' with limited API and potential breaking changes.
As a dynamic templating engine, it introduces runtime parsing and rendering overhead compared to compile-time alternatives like Askama.
Creating custom helpers requires Rust or Rhai knowledge, adding a learning curve for teams accustomed to JavaScript-based Handlebars.
Integration with web frameworks (e.g., Actix, Axum) relies on third-party crates or examples, which may lack official support or documentation.
Frequently Asked Questions
Related Projects
tokio/axumHTTP routing and request-handling library for Rust that focuses on ergonomics and modularity
RocketA web framework for Rust.
actix-webActix Web is a powerful, pragmatic, and extremely fast web framework for Rust.
VectorA high-performance observability data pipeline.
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