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wtf is leptos-fmt?

codeitlikemiley/leptos-fmt — explained in plain English

Analysis updated 2026-07-19 · repo last pushed 2025-03-12

4TypeScriptAudience · developerComplexity · 2/5StaleSetup · moderate

TL;DR

A VS Code extension that automatically formats Rust code using the Leptos web framework, bridging VS Code's Rust Analyzer with the leptosfmt command-line tool so inline HTML-like view syntax stays clean on save.

Mindmap

mindmap
  root((repo))
    What it does
      Formats Leptos Rust code
      Runs on save
      Bridges Rust Analyzer
    Tech stack
      TypeScript
      VS Code Extension API
      Rust Analyzer
    Use cases
      Auto-format on save
      Multi-project workspaces
      Custom toolchain paths
    Audience
      Rust web developers
      Leptos framework users
    Setup
      Install leptosfmt CLI
      Run Leptos Init command
      Configure settings file

Code map

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Why would anyone build with this?

REASON 1

Automatically format Leptos view code every time you save a Rust file in VS Code.

REASON 2

Manually trigger formatting with a keyboard shortcut in multi-project workspaces to keep settings isolated.

REASON 3

Point the extension to a custom leptosfmt binary or Cargo home when your Rust toolchain is in a non-standard location.

REASON 4

Run the Leptos Init command to auto-generate formatter configuration without editing settings files by hand.

What's in the stack?

TypeScriptVS Code Extension APIRust Analyzerleptosfmt

How it stacks up

codeitlikemiley/leptos-fmt0labs-in/vision-linkarviahq/arvia
Stars444
LanguageTypeScriptTypeScriptTypeScript
Last pushed2025-03-12
MaintenanceStale
Setup difficultymoderatemoderatemoderate
Complexity2/53/53/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 5min

Requires the external leptosfmt CLI tool installed separately via Cargo, plus Rust Analyzer running in VS Code.

No license information is provided in the repository, so usage terms are unclear.

Wtf does this do

Leptos-fmt is a VS Code extension that automatically formats code written with Leptos, a popular Rust framework for building web apps. If you've ever used a code formatter that cleans up indentation and spacing on save, this does exactly that, but specifically for Rust files containing Leptos components. Without it, standard Rust formatters can stumble over Leptos's inline HTML-like syntax, leaving your code messy or incorrectly structured. Once installed, the extension taps into Rust Analyzer (the language server that powers Rust development in VS Code) and tells it to use a separate tool called leptosfmt for formatting instead of the default Rust formatter. You run a command called "Leptos Init" from VS Code's command palette, and the extension writes the necessary configuration into your project's settings file. After that, formatting just works as part of your normal workflow. For more complex setups, say you have multiple projects in one workspace and don't want formatting settings from one leaking into another, the extension offers a "Format with Leptosfmt" command you can trigger manually or bind to a keyboard shortcut. You can also point the extension to custom paths for the leptosfmt binary and your Cargo home directory, which is useful if your Rust toolchain lives in a non-standard location. This tool is built for developers already working with Leptos in VS Code. A typical user might be someone building a full-stack Rust web app who wants their Leptos views to stay consistently formatted without fighting the default Rust formatter. The extension is lightweight, it's essentially a bridge between VS Code, Rust Analyzer, and the leptosfmt command-line tool, which you need to install separately via Rust's package manager. That means it relies on that external tool being present, but it spares you from having to manually wire all the configuration together yourself.

Yoink these prompts

Prompt 1
Install the leptos-fmt VS Code extension and run the 'Leptos Init' command, then show me what configuration it writes to my project settings so I can verify it's correct.
Prompt 2
Set up the leptos-fmt VS Code extension for a workspace with multiple Leptos projects, using the 'Format with Leptosfmt' command bound to a keyboard shortcut so formatting stays isolated per project.
Prompt 3
Configure the leptos-fmt extension to use a custom path for the leptosfmt binary and Cargo home directory because my Rust toolchain is installed in a non-standard location.
Prompt 4
Help me install the leptosfmt command-line tool via Cargo so the leptos-fmt VS Code extension can find and use it for formatting my Leptos views.

Frequently asked questions

wtf is leptos-fmt?

A VS Code extension that automatically formats Rust code using the Leptos web framework, bridging VS Code's Rust Analyzer with the leptosfmt command-line tool so inline HTML-like view syntax stays clean on save.

What language is leptos-fmt written in?

Mainly TypeScript. The stack also includes TypeScript, VS Code Extension API, Rust Analyzer.

Is leptos-fmt actively maintained?

Stale — no commits in 1-2 years (last push 2025-03-12).

What license does leptos-fmt use?

No license information is provided in the repository, so usage terms are unclear.

How hard is leptos-fmt to set up?

Setup difficulty is rated moderate, with roughly 5min to a first successful run.

Who is leptos-fmt for?

Mainly developer.

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