Rust creator launches Topcoat framework for server-rendered web apps
Carl Lerche, the Rust developer behind the Tokio asynchronous runtime, has introduced Topcoat, a framework for building server-rendered web applications in Rust. It compiles Rust into JavaScript for browser interaction and runs most application logic on the server, aiming to combine Rust’s performance and safety with quicker page loading.
Topcoat updates parts of a page without refreshing the whole page, renders components together and can stream data into placeholders while a page loads. Its integration with Lerche’s Toasty database tool lets components fetch data directly on the server, avoiding extra data conversion between server and browser. Lerche says it suits common database-driven sites, though not complex applications such as Figma; other Rust frameworks often compile to WebAssembly, which can have slower initial loading.
In short
- Topcoat brings Rust to server-rendered web apps.
- It compiles browser-facing code into JavaScript.
- It targets everyday database-driven sites, not complex apps.
Explained simply
Rust is a programming language used to build software, including tools that handle many tasks at once. Web applications can run code in a visitor’s browser, on a web server, or across both; server-rendered sites prepare much of each page on the server before sending it to the browser.
Carl Lerche is a Rust developer known for creating Tokio, a tool for running tasks asynchronously. Topcoat is designed to let developers build interactive websites with Rust while keeping most of the application’s work on the server. Its companion database tool, Toasty, helps components retrieve information directly from that server.
Where an application runs can affect how quickly pages appear and how they respond to user actions. Rust web frameworks take different approaches: some send code to the browser as WebAssembly, while Topcoat compiles Rust to JavaScript for browser interactions. These choices may suit different kinds of websites, from database-driven services to more complex interactive tools.
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Originally published by The Register as “Topcoat enables Rust to render server-side web apps”.