Tauri V2

Tauri v2+ Development Skill

Build cross-platform desktop and mobile apps with web frontends and Rust backends.

Before You Start

This skill prevents 8+ common errors and saves ~60% tokens.

Known Issues This Skill Prevents

1. Permission denied errors from missing capabilities
2. IPC failures from unregistered commands in generate_handler!
3. State management panics from type mismatches
4. Mobile build failures from missing Rust targets
5. White screen issues from misconfigured dev URLs

Quick Start

Step 1: Create a Tauri Command

// 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");
}

Why this matters: Commands not in generate_handler![] silently fail when invoked from frontend.

main.rs stays thin: src-tauri/src/main.rs should only be a thin passthrough — all application logic lives in lib.rs:

// src-tauri/src/main.rs
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
fn main() {
    app_lib::run();
}

This split is required for mobile builds — Tauri replaces main() with mobile_entry_point on mobile targets.

Step 2: Call from Frontend

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

const greeting = await invoke<string>("greet", { name: "World" });
console.log(greeting); // "Hello, World!"

Why this matters: Use @tauri-apps/api/core (not @tauri-apps/api/tauri - that's v1 API).

Step 3: Add Required Permissions

// src-tauri/capabilities/default.json
{
  "$schema": "../gen/schemas/desktop-schema.json",
  "identifier": "default",
  "windows": ["main"],
  "permissions": ["core:default"]
}

Why this matters: Tauri v2 denies everything by default - explicit permissions required for all operations.

Critical Rules

Always Do

• Register every command in tauri::generate_handler![cmd1, cmd2, ...]
• Return Result<T, E> from commands for proper error handling
• Use Mutex<T> for shared state accessed from multiple commands
• Add capabilities before using any plugin features
• Use lib.rs for shared code (required for mobile builds)
• Use #[cfg_attr(mobile, tauri::mobile_entry_point)] on pub fn run() in lib.rs for mobile compatibility

Never Do

• Never use borrowed types (&str) in async commands - use owned types
• Never block the main thread - use async for I/O operations
• Never hardcode paths - use Tauri path APIs (app.path())
• Never skip capability setup - even "safe" operations need permissions

Common Mistakes

Wrong - Borrowed type in async:

#[tauri::command]
async fn bad(name: &str) -> String { // Compile error!
    name.to_string()
}

Correct - Owned type:

#[tauri::command]
async fn good(name: String) -> String {
    name
}

Why: Async commands cannot borrow data across await points; Tauri requires owned types for async command parameters.

Known Issues Prevention

Deep-Dive References

• Security & permissions → references/capabilities-reference.md
• IPC decision guide → references/ipc-patterns.md
• Official plugins → references/plugin-reference.md
• Updater & distribution → references/updater-distribution-reference.md
• Tray, sidecars, deep links → references/advanced-runtime-reference.md

Configuration Reference

tauri.conf.json

{
  "$schema": "./gen/schemas/desktop-schema.json",
  "productName": "my-app",
  "version": "1.0.0",
  "identifier": "com.example.myapp",
  "build": {
    "devUrl": "http://localhost:5173",
    "frontendDist": "../dist",
    "beforeDevCommand": "npm run dev",
    "beforeBuildCommand": "npm run build"
  },
  "app": {
    "windows": [
      {
        "label": "main",
        "title": "My App",
        "width": 800,
        "height": 600
      }
    ],
    "security": {
      "csp": "default-src 'self'; img-src 'self' data:",
      "capabilities": ["default"]
    }
  },
  "bundle": {
    "active": true,
    "targets": "all",
    "icon": ["icons/icon.icns", "icons/icon.ico", "icons/icon.png"]
  }
}

Key settings:

• build.devUrl: Must match your frontend dev server port
• app.security.capabilities: Array of capability file identifiers

Plugin configuration — Some plugins require additional tauri.conf.json blocks (e.g., store, updater). Always check the specific plugin docs at v2.tauri.app/plugin/<plugin-name>/ for required config keys.

Project Structure

my-tauri-app/
├── src/                    # Frontend source
├── src-tauri/
│   ├── src/
│   │   ├── main.rs         # Thin passthrough — calls lib::run()
│   │   └── lib.rs          # ALL application logic lives here
│   ├── capabilities/
│   │   └── default.json    # Capability definitions (grant permissions here)
│   ├── tauri.conf.json     # App configuration (devUrl, bundle, security)
│   ├── Cargo.toml          # Rust dependencies
│   └── build.rs            # Build script (required for tauri-build)
└── package.json

Why lib.rs owns all logic: Tauri replaces main() with #[cfg_attr(mobile, tauri::mobile_entry_point)] on mobile. All commands, state, and builder setup must live in lib.rs::run().

Cargo.toml

[package]
name = "app"
version = "0.1.0"
edition = "2021"

[lib]
name = "app_lib"
crate-type = ["staticlib", "cdylib", "rlib"]

[build-dependencies]
tauri-build = { version = "2", features = [] }

[dependencies]
tauri = { version = "2", features = [] }
serde = { version = "1", features = ["derive"] }
serde_json = "1"

Key settings:

• [lib] section: Required for mobile builds
• crate-type: Must include all three types for cross-platform

Common Patterns

Error Handling Pattern

Use Result<T, E> and thiserror for type-safe error propagation across the IPC boundary. See references/ipc-patterns.md for full implementation details.

use thiserror::Error;

#[derive(Debug, 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>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where S: serde::ser::Serializer {
        serializer.serialize_str(self.to_string().as_ref())
    }
}

#[tauri::command]
fn risky_operation() -> Result<String, AppError> {
    Ok("success".into())
}

Serde Boundary Rules

All command arguments must implement serde::Deserialize, and return types must implement serde::Serialize. This is how Tauri bridges JSON over the IPC boundary.

use serde::{Deserialize, Serialize};

#[derive(Deserialize)]
struct CreateUserArgs {
    name: String,
    email: String,
    role: Option<String>,  // Optional fields use Option<T>
}

#[derive(Serialize)]
struct User {
    id: u64,
    name: String,
}

#[tauri::command]
fn create_user(args: CreateUserArgs) -> Result<User, String> {
    Ok(User { id: 1, name: args.name })
}

Common serde pitfalls:

• Field names are camelCase in JS, snake_case in Rust — Tauri automatically converts between them
• Option<T> maps to optional JS arguments (can be undefined or null)
• Complex enums need #[serde(tag = "type")] or similar to be JSON-safe
• Error types must also implement Serialize (see Error Handling Pattern above)

State Management Pattern

Tauri state manages application data across commands. See references/ipc-patterns.md for more complex state patterns.

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

struct AppState {
    counter: u32,
}

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

// In builder:
tauri::Builder::default()
    .manage(Mutex::new(AppState { counter: 0 }))

Event Emission Pattern

Events are fire-and-forget notifications. See references/ipc-patterns.md for bidirectional examples.

use tauri::Emitter;

#[tauri::command]
fn start_task(app: tauri::AppHandle) {
    std::thread::spawn(move || {
        app.emit("task-progress", 50).unwrap();
        app.emit("task-complete", "done").unwrap();
    });
}

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

const unlisten = await listen("task-progress", (e) => {
  console.log("Progress:", e.payload);
});
// Call unlisten() when done

Channel Streaming Pattern

Channels provide high-frequency, typed streaming from Rust to Frontend. See references/ipc-patterns.md for full implementation details.

use tauri::ipc::Channel;

#[derive(Clone, serde::Serialize)]
#[serde(tag = "event", content = "data")]
enum DownloadEvent {
    Progress { percent: u32 },
    Complete { path: String },
}

#[tauri::command]
async fn download(url: String, on_event: Channel<DownloadEvent>) {
    for i in 0..=100 {
        on_event.send(DownloadEvent::Progress { percent: i }).unwrap();
    }
    on_event.send(DownloadEvent::Complete { path: "/downloads/file".into() }).unwrap();
}

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

const channel = new Channel<DownloadEvent>();
channel.onmessage = (msg) => console.log(msg.event, msg.data);
await invoke("download", { url: "https://...", onEvent: channel });

Window Access Pattern

Tauri v2 uses WebviewWindow for unified window and webview management.

use tauri::Manager;

#[tauri::command]
fn focus_window(app: tauri::AppHandle) {
    if let Some(window) = app.get_webview_window("main") {
        let _ = window.set_focus();
    }
}

Why this matters: Use tauri::WebviewWindow and app.get_webview_window("label") in v2 — the v1 app.get_window() API is removed in v2.

Bundled Resources

References

Located in references/:

• capabilities-reference.md - Permission patterns and examples
• ipc-patterns.md - Complete IPC examples
• plugin-reference.md - Official plugin install, registration, and permission strings
• updater-distribution-reference.md - Signing, HTTPS requirements, and bundle shipping
• advanced-runtime-reference.md - TrayIconBuilder, sidecars, deep links, and asset protocols

Note: For deep dives on specific topics, see the reference files above.

Dependencies

Required

*Last verified: 2026-04-02. Always check official changelog for feature timing.

Optional (Plugins)

Plugin permissions are mandatory. Installing a plugin without adding its permission string to a capability file causes silent runtime failures. See references/plugin-reference.md for full install + permission details for all official plugins.

Official Documentation

• Tauri v2+ Documentation
• Commands Reference
• Capabilities & Permissions
• Configuration Reference

Troubleshooting

White Screen on Launch

Symptoms: App launches but shows blank white screen

Solution:

1. Verify devUrl matches your frontend dev server port
2. Check beforeDevCommand runs your dev server
3. Open DevTools (Cmd+Option+I / Ctrl+Shift+I) to check for errors

Command Returns Undefined

Symptoms: invoke() returns undefined instead of expected value

Solution:

1. Verify command is in generate_handler![]
2. Check Rust command actually returns a value
3. Ensure argument names match (camelCase in JS, snake_case in Rust by default)

Mobile Build Failures

Symptoms: Android/iOS build fails with missing target

Solution:

# Android targets
rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android

# iOS targets (macOS only)
rustup target add aarch64-apple-ios x86_64-apple-ios aarch64-apple-ios-sim

Desktop vs Mobile Behavioral Differences

Not all Tauri APIs and plugins support mobile (iOS/Android). Before using any plugin or API in a mobile build:

1. Check the plugin page at v2.tauri.app/plugin/<name>/ for platform support matrix
2. Common desktop-only items: System tray (TrayIconBuilder), window labels/multi-window, some shell plugin features
3. Mobile-safe patterns: IPC commands/events/channels work on all platforms; tauri::AppHandle is mobile-safe
4. Conditional compilation: Use #[cfg(desktop)] / #[cfg(mobile)] for platform-specific Rust logic

#[tauri::command]
fn platform_info() -> String {
    #[cfg(desktop)]
    return "desktop".to_string();
    #[cfg(mobile)]
    return "mobile".to_string();
}

Setup Checklist

Before using this skill, verify:

• npx tauri info shows correct Tauri v2 versions
• src-tauri/capabilities/default.json exists with at least core:default
• All commands registered in generate_handler![]
• lib.rs contains shared code (for mobile support)
• Required Rust targets installed for target platforms

Source: varandrew/moor — distributed by TomeVault.