Learn Leptos-rust - 10 Code Examples & CST Typing Practice Test

Leptos is a modern Rust framework for building full-stack web applications with reactive, fine-grained reactivity, enabling developers to write front-end and back-end code in Rust that compiles to WebAssembly for the browser.

View all 10 Leptos-rust code examples →

Simple Leptos Component Leptos Button Click Leptos Counter Component Leptos Conditional Rendering Leptos Todo List Leptos List Rendering Leptos Input Binding Leptos Click Counter Leptos Multiple Elements Leptos Conditional Class

Learn LEPTOS-RUST with Real Code Examples

Updated Nov 25, 2025

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Code Sample Descriptions

Simple Leptos Component

# leptos/demo/main.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        h1 {"Hello, Leptos!"}
    }
}

fn main() {
    mount_to_body(App);
}

A basic Leptos app displaying 'Hello, Leptos!' in the browser.

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Leptos Button Click

# leptos/demo/button.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        button(on:click=move |_| log!("Button clicked!")) {"Click me"}
    }
}

fn main() {
    mount_to_body(App);
}

A button that logs a message on click.

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Leptos Counter Component

# leptos/demo/counter.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let count = create_signal(0);
    view! {
        div {
        button(on:click=move |_| count.update(|c| *c -= 1)) {"-"}
        span {(count.get())}
        button(on:click=move |_| count.update(|c| *c += 1)) {"+"}
        }
    }
}

fn main() {
    mount_to_body(App);
}

A simple counter using Leptos signals.

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Leptos Conditional Rendering

# leptos/demo/conditional.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let logged_in = create_signal(false);
    view! {
        div {
        (if logged_in.get() { view! { h1 {"Welcome back!"} } } else { view! { h1 {"Please log in"} } }),
        button(on:click=move |_| logged_in.update(|v| *v = !*v)) {"Toggle"}
        }
    }
}

fn main() {
    mount_to_body(App);
}

Displays different messages based on a signal.

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Leptos Todo List

# leptos/demo/todo.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let todos = create_signal(Vec::<String>::new());
    let input = create_signal(String::new());
    view! {
        div {
        input(bind:value=input)
        button(on:click=move |_| { todos.update(|t| t.push(input.get())); input.set(String::new()); }) {"Add"}
        ul { for todos.get().iter().map(|todo| view!{ li { (todo) } }) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

A simple Todo list using signals.

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Leptos List Rendering

# leptos/demo/list.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let items = create_signal(vec!["One", "Two", "Three"]);
    view! {
        ul { for items.get().iter().map(|item| view!{ li { (item) } }) }
    }
}

fn main() {
    mount_to_body(App);
}

Renders a list of items dynamically.

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Leptos Input Binding

# leptos/demo/input.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let text = create_signal(String::new());
    view! {
        div {
        input(bind:value=text)
        p { (text.get()) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Binds an input value to a signal and displays it.

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Leptos Click Counter

# leptos/demo/click_counter.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let count = create_signal(0);
    view! {
        div {
        button(on:click=move |_| count.update(|c| *c += 1)) {"Click me"}
        span { (count.get()) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Counts clicks on a button using a signal.

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Leptos Multiple Elements

# leptos/demo/multiple.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        div {
        h1 {"Header"}
        p {"This is a paragraph."}
        ul { li {"Item 1"} li {"Item 2"} }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Displays multiple elements in a single view.

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Leptos Conditional Class

# leptos/demo/conditional_class.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let active = create_signal(false);
    view! {
        button(class:if active.get() {"active"} else {""}, on:click=move |_| active.update(|v| *v = !*v)) {"Toggle Class"}
    }
}

fn main() {
    mount_to_body(App);
}

Applies CSS class conditionally using a signal.

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Frequently Asked Questions about Leptos-rust

What is Leptos-rust?

What are the primary use cases for Leptos-rust?

Building single-page applications (SPA) with Rust. Developing full-stack Rust web apps with SSR. Creating interactive dashboards and admin panels. High-performance front-end applications without JavaScript. Porting Rust logic to browser via WebAssembly

What are the strengths of Leptos-rust?

Write front-end and back-end in one language (Rust). High-performance WebAssembly execution. Type safety reduces runtime errors. Reactive updates without virtual DOM overhead. Strong integration with Rust tooling and crates

What are the limitations of Leptos-rust?

Smaller ecosystem compared to JavaScript frameworks. Learning curve for Rust and WebAssembly newcomers. SSR setup can be complex for beginners. Debugging WebAssembly code is less mature than JS debugging. Limited third-party UI libraries compared to JS

How can I practice Leptos-rust typing speed?

CodeSpeedTest offers 10+ real Leptos-rust code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Simple Leptos Component

# leptos/demo/main.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        h1 {"Hello, Leptos!"}
    }
}

fn main() {
    mount_to_body(App);
}

A basic Leptos app displaying 'Hello, Leptos!' in the browser.

Let’s Try →

Leptos Button Click

# leptos/demo/button.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        button(on:click=move |_| log!("Button clicked!")) {"Click me"}
    }
}

fn main() {
    mount_to_body(App);
}

A button that logs a message on click.

Let’s Try →

Leptos Counter Component

# leptos/demo/counter.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let count = create_signal(0);
    view! {
        div {
        button(on:click=move |_| count.update(|c| *c -= 1)) {"-"}
        span {(count.get())}
        button(on:click=move |_| count.update(|c| *c += 1)) {"+"}
        }
    }
}

fn main() {
    mount_to_body(App);
}

A simple counter using Leptos signals.

Let’s Try →

Leptos Conditional Rendering

# leptos/demo/conditional.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let logged_in = create_signal(false);
    view! {
        div {
        (if logged_in.get() { view! { h1 {"Welcome back!"} } } else { view! { h1 {"Please log in"} } }),
        button(on:click=move |_| logged_in.update(|v| *v = !*v)) {"Toggle"}
        }
    }
}

fn main() {
    mount_to_body(App);
}

Displays different messages based on a signal.

Let’s Try →

Leptos Todo List

# leptos/demo/todo.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let todos = create_signal(Vec::<String>::new());
    let input = create_signal(String::new());
    view! {
        div {
        input(bind:value=input)
        button(on:click=move |_| { todos.update(|t| t.push(input.get())); input.set(String::new()); }) {"Add"}
        ul { for todos.get().iter().map(|todo| view!{ li { (todo) } }) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

A simple Todo list using signals.

Let’s Try →

Leptos List Rendering

# leptos/demo/list.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let items = create_signal(vec!["One", "Two", "Three"]);
    view! {
        ul { for items.get().iter().map(|item| view!{ li { (item) } }) }
    }
}

fn main() {
    mount_to_body(App);
}

Renders a list of items dynamically.

Let’s Try →

Leptos Input Binding

# leptos/demo/input.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let text = create_signal(String::new());
    view! {
        div {
        input(bind:value=text)
        p { (text.get()) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Binds an input value to a signal and displays it.

Let’s Try →

Leptos Click Counter

# leptos/demo/click_counter.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let count = create_signal(0);
    view! {
        div {
        button(on:click=move |_| count.update(|c| *c += 1)) {"Click me"}
        span { (count.get()) }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Counts clicks on a button using a signal.

Let’s Try →

Leptos Multiple Elements

# leptos/demo/multiple.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    view! {
        div {
        h1 {"Header"}
        p {"This is a paragraph."}
        ul { li {"Item 1"} li {"Item 2"} }
        }
    }
}

fn main() {
    mount_to_body(App);
}

Displays multiple elements in a single view.

Let’s Try →

Leptos Conditional Class

# leptos/demo/conditional_class.rs
use leptos::*;

#[component]
fn App() -> impl IntoView {
    let active = create_signal(false);
    view! {
        button(class:if active.get() {"active"} else {""}, on:click=move |_| active.update(|v| *v = !*v)) {"Toggle Class"}
    }
}

fn main() {
    mount_to_body(App);
}

Applies CSS class conditionally using a signal.

Let’s Try →

Frequently Asked Questions about Leptos-rust

What is Leptos-rust?

What are the primary use cases for Leptos-rust?

What are the strengths of Leptos-rust?

What are the limitations of Leptos-rust?

How can I practice Leptos-rust typing speed?

CodeSpeedTest offers 10+ real Leptos-rust code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.