Tauri V2

Tauri v2 Development Skill

Tauri v2 lets you build tiny, fast apps for desktop (macOS, Windows, Linux) and mobile (iOS, Android) by combining a web frontend with a Rust backend. Apps use the system's native webview instead of bundling a browser engine, so a minimal app can be under 600KB.

Default stack in this skill: React + Vite + TypeScript frontend, Rust backend. Adapt if the user specifies a different framework.

Quick Reference

• Config file: src-tauri/tauri.conf.json
• Rust entry: src-tauri/src/lib.rs (or main.rs)
• Capabilities: src-tauri/capabilities/*.json
• Permissions: src-tauri/permissions/*.toml
• JS API: @tauri-apps/api
• CLI: @tauri-apps/cli (npm) or tauri-cli (cargo)

For detailed reference on configuration, plugins, permissions, and mobile setup, see the references/ directory. Read the relevant file when you need specifics beyond what's covered here.

Prerequisites

Before creating a Tauri project, ensure these are installed:

All platforms: Rust via rustup (curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh), Node.js LTS

macOS: Xcode or Xcode Command Line Tools (xcode-select --install)

Windows: Microsoft C++ Build Tools (select "Desktop development with C++"), WebView2 Runtime (pre-installed on Windows 10+), rustup default stable-msvc

Linux (Debian/Ubuntu):

sudo apt install libwebkit2gtk-4.1-dev build-essential curl wget file libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev

Mobile (optional): See references/mobile.md for Android Studio / iOS setup.

Creating a Project

Scaffolding (recommended)

npm create tauri-app@latest
# Choose: TypeScript/JavaScript → pnpm/npm → React → TypeScript
cd my-app
npm install
npm run tauri dev

This creates a project with src/ (React frontend) and src-tauri/ (Rust backend).

Adding Tauri to an existing project

npm install -D @tauri-apps/cli@latest
npx tauri init

Answer the prompts for app name, dev server URL (e.g. http://localhost:5173 for Vite), and frontend dist directory (e.g. ../dist).

Core Concepts

Commands — Frontend calls Rust

Commands are the primary way the frontend talks to the backend. Define a Rust function with #[tauri::command], register it, and call it from JS with invoke.

Rust side (src-tauri/src/lib.rs):

#[tauri::command]
fn greet(name: String) -> String {
    format!("Hello, {}!", name)
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![greet])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}

JS side:

import { invoke } from '@tauri-apps/api/core';

const greeting = await invoke<string>('greet', { name: 'World' });

Key rules:

• Command names must be unique across the app
• Rust args are snake_case, JS passes them as camelCase (e.g. invoke_message → { invokeMessage: '...' })
• Use #[tauri::command(rename_all = "snake_case")] to keep snake_case on both sides
• Commands can be async for non-blocking work
• Return Result<T, String> (or custom error types) for error handling — Err rejects the JS promise

Events — Rust notifies the frontend

For fire-and-forget notifications or streaming updates, use the event system:

Rust emitting:

use tauri::{AppHandle, Emitter};

#[tauri::command]
fn start_download(app: AppHandle, url: String) {
    app.emit("download-progress", 50).unwrap();
}

JS listening:

import { listen } from '@tauri-apps/api/event';

const unlisten = await listen<number>('download-progress', (event) => {
    console.log(`Progress: ${event.payload}%`);
});
// Call unlisten() to stop listening

Channels — High-throughput streaming

For ordered, high-throughput data (file reads, progress), use channels instead of events:

use tauri::ipc::Channel;

#[tauri::command]
async fn stream_data(on_chunk: Channel<Vec<u8>>) {
    for chunk in data_chunks {
        on_chunk.send(chunk).unwrap();
    }
}

import { invoke, Channel } from '@tauri-apps/api/core';

const Channel<Uint8Array>();
onChunk.onmessage = (chunk) => { /* handle chunk */ };
await invoke('stream_data', { onChunk });

State Management

Register state with .manage() and inject it into commands with State<>:

use std::sync::Mutex;
use tauri::State;

struct AppState {
    count: u32,
}

#[tauri::command]
fn increment(state: State<'_, Mutex<AppState>>) -> u32 {
    let mut s = state.lock().unwrap();
    s.count += 1;
    s.count
}

// In run():
tauri::Builder::default()
    .manage(Mutex::new(AppState { count: 0 }))
    .invoke_handler(tauri::generate_handler![increment])

Important: Tauri wraps state in Arc automatically — don't wrap in Arc yourself. Use Mutex for mutable state. Use std::sync::Mutex (not tokio's) unless you need to hold the lock across .await points.

Type mismatch pitfall: If you .manage(Mutex::new(state)) but inject State<'_, AppState> (without Mutex), it panics at runtime, not compile time. Use a type alias to prevent this:

type AppState = Mutex<AppStateInner>;

Configuration — tauri.conf.json

The config file lives at src-tauri/tauri.conf.json. Key sections:

{
  "productName": "My App",
  "version": "1.0.0",
  "identifier": "com.example.myapp",  // Required, reverse domain notation
  "build": {
    "devUrl": "http://localhost:5173",      // Dev server URL
    "frontendDist": "../dist",              // Production build output
    "beforeDevCommand": "npm run dev",      // Starts your dev server
    "beforeBuildCommand": "npm run build"   // Builds frontend for production
  },
  "app": {
    "windows": [{
      "title": "My App",
      "width": 1024,
      "height": 768
    }],
    "security": {
      "capabilities": []  // Reference capability files here
    }
  },
  "bundle": {
    "active": true,
    "targets": "all",
    "icon": ["icons/32x32.png", "icons/128x128.png", "icons/icon.icns", "icons/icon.ico"]
  }
}

Platform-specific overrides: tauri.linux.conf.json, tauri.windows.conf.json, tauri.macos.conf.json — these merge with the main config.

See references/config.md for the full configuration reference.

Security — Permissions & Capabilities

Tauri v2 has a capability-based security model. By default, the frontend cannot call any commands — you must explicitly grant access.

Capabilities

A capability grants a set of permissions to specific windows. Create JSON files in src-tauri/capabilities/:

{
  "identifier": "main-capability",
  "description": "Permissions for the main window",
  "windows": ["main"],
  "permissions": [
    "core:default",
    "my-app:default"
  ]
}

Permissions for your own commands

Define in src-tauri/permissions/default.toml:

[default]
description = "Default permissions for the app"
permissions = ["allow-greet", "allow-increment"]

Each command you register automatically gets allow-<command-name> and deny-<command-name> identifiers.

Plugin permissions

Plugins ship their own permissions. Add them to your capability:

{
  "permissions": [
    "core:default",
    "fs:default",
    "fs:allow-read-file",
    "dialog:default",
    "shell:allow-open"
  ]
}

Scoped permissions

Restrict commands to specific paths/resources:

[[permission]]
identifier = "scope-home"
description = "Access files in $HOME"

[[scope.allow]]
path = "$HOME/*"

See references/permissions.md for the full permissions reference.

Plugins

Install official plugins via npm + cargo:

npm install @tauri-apps/plugin-fs
# The Cargo dependency is added automatically by the CLI

Register in Rust:

tauri::Builder::default()
    .plugin(tauri_plugin_fs::init())

Use in JS:

import { readTextFile } from '@tauri-apps/plugin-fs';
const content = await readTextFile('/path/to/file');

Don't forget to add the plugin's permissions to your capability file.

Common official plugins: fs, dialog, shell, http, notification, clipboard, store, global-shortcut, updater, window-state, autostart, log, sql, stronghold.

See references/plugins.md for the full plugin list and usage patterns.

Building & Distribution

Desktop builds

npm run tauri build

This compiles the Rust backend, builds the frontend, and creates platform-specific installers:

• macOS: .dmg, .app bundle
• Windows: .msi (WiX), .exe (NSIS)
• Linux: .deb, .rpm, .AppImage

Mobile builds

npx tauri android build
npx tauri ios build

Code signing

Required for distribution on most platforms. See the Tauri docs for platform-specific signing guides.

Auto-updates

Use the @tauri-apps/plugin-updater plugin for in-app updates. Set "createUpdaterArtifacts": true in bundle config.

Common Patterns

Organizing commands in modules

// src-tauri/src/commands/mod.rs
pub mod files;
pub mod users;

// src-tauri/src/commands/files.rs
#[tauri::command]
pub fn read_config() -> String { /* ... */ }

// src-tauri/src/lib.rs
mod commands;
tauri::Builder::default()
    .invoke_handler(tauri::generate_handler![
        commands::files::read_config,
        commands::users::login,
    ])

Returning large binary data efficiently

Use tauri::ipc::Response to avoid JSON serialization overhead:

use tauri::ipc::Response;

#[tauri::command]
fn read_file(path: String) -> Response {
    let data = std::fs::read(&path).unwrap();
    Response::new(data)
}

Custom error types

#[derive(Debug, thiserror::Error)]
enum AppError {
    #[error("IO error: {0}")]
    Io(#[from] std::io::Error),
    #[error("Not found: {0}")]
    NotFound(String),
}

impl serde::Serialize for AppError {
    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        serializer.serialize_str(&self.to_string())
    }
}

#[tauri::command]
fn load_data(path: String) -> Result<String, AppError> {
    Ok(std::fs::read_to_string(&path)?)
}

Accessing the window or app handle in commands

#[tauri::command]
async fn get_window_title(window: tauri::WebviewWindow) -> String {
    window.title().unwrap_or_default()
}

#[tauri::command]
async fn get_app_dir(app: tauri::AppHandle) -> std::path::PathBuf {
    app.path().app_data_dir().unwrap()
}

Troubleshooting

"command X not found" — Make sure you added the command to generate_handler![] AND granted permission in a capability file.

Permission denied at runtime — Check that your capability file includes the permission for the command or plugin you're calling, and that the window label matches.

tauri dev shows blank window — Verify devUrl in tauri.conf.json matches your dev server's actual URL and port. Make sure beforeDevCommand starts your dev server.

State panic at runtime — You're injecting the wrong type. If you .manage(Mutex::new(state)), inject State<'_, Mutex<MyState>>, not State<'_, MyState>.

Slow first build — Normal. Rust compiles all dependencies on first build (can take several minutes). Subsequent builds are incremental and much faster.

Mobile: dev server not reachable — iOS devices need TAURI_DEV_HOST set. Use tauri ios dev which handles this automatically.