webview_execute_js
Execute JavaScript in a Tauri webview to access Tauri APIs and retrieve JSON-serializable return values using IIFE syntax.
Instructions
[Tauri Apps Only] Execute JavaScript in a Tauri app's webview context. Requires active driver_session. Has access to window.TAURI. If you need a return value, it must be JSON-serializable. For functions that return values, use an IIFE: "(() => { return 5; })()" not "() => { return 5; }". Targets the only connected app, or the default app if multiple are connected. Specify appIdentifier (port or bundle ID) to target a specific app. For browser JS execution, use Chrome DevTools MCP instead.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| windowId | No | Window label to target (defaults to "main") | |
| appIdentifier | No | App port or bundle ID to target. Defaults to the only connected app or the default app if multiple are connected. | |
| script | Yes | JavaScript code to execute in the webview context. If returning a value, it must be JSON-serializable. For functions that return values, use IIFE syntax: "(() => { return value; })()" not "() => { return value; }" | |
| args | No | Arguments to pass to the script |