Qt has two main ways to help make an application scriptable. All of them allow easy integration of the ECMAScript (more widely known as JavaScript) language into the application. Depending on how deep the integration should be, one of these APIs can be used:


This is a simple API, but limited to basic functionality. The main classes are QJSEngine and QJSValue, which can be used to embed pure ECMAScript functionality like evaluating scripts and calling functions.


QML exposes a modified ECMAScript environment. It is designed to mix well with the JavaScript API mentioned earlier. QML may be used without Qt Quick components, which may be useful for server side scripting. With QML it is possible to mix pure ECMAScript and declarative components (Use Case - Integrating JavaScript in QML).

All of these three scripting solutions seamlessly inter-operate with the Meta-Object System, which means that all signals and slots and properties of a QObject instance are accessible in an ECMAScript environment.

© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.