tauri-v2

name

tauri-v2

description

Use this skill whenever "tauri" appears in the user's message, or they reference tauri.conf.json, src-tauri, or @tauri-apps packages. Also use when converting a web app (React, Vue, Svelte, etc.) into a desktop application without Electron. Covers: creating Tauri v2 projects, Rust commands and IPC (invoke/events/channels), permissions and capabilities config, official Tauri plugins (fs, dialog, updater, stronghold, store, etc.), state management, window configuration, building/bundling for macOS/Windows/Linux/mobile, and debugging Tauri-specific errors like blank windows, lifetime errors in commands, or permission denied issues. Do NOT use for Electron, Flutter, Wails, or general Rust development unrelated to Tauri.

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 onChunk = new 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": 
    
     
         
    
  
   
     
     
        
  

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.