Stimulus is a modest JavaScript framework that augments existing HTML with behavior through controller, target, and action attributes.
Stimulus solves the problem of adding interactivity to server-rendered HTML without requiring a complete front-end rewrite or adopting a full-featured framework. Rather than managing rendering, it watches the DOM and automatically connects JavaScript controllers to HTML elements marked with special attributes. This approach works seamlessly with any DOM updates, whether from full page loads, partial page replacements, or Ajax requests. Controllers are written as simple classes that respond to user interactions and lifecycle events, with Stimulus handling the wiring automatically.
Stimulus suits projects where HTML is generated server-side and you need targeted interactivity without the overhead of a single-page application framework. It pairs particularly well with server-driven architectures that use partial page updates. The framework requires no build step if you prefer to load it via a script tag, though it integrates with standard asset packaging systems. Developers can write their first controller in minutes by following the handbook.
The project maintains an active issue tracker and welcomes pull requests. Development follows a structured workflow with local installation via yarn, a dev server for running examples, unit tests, linting with ESLint, and code formatting with Prettier.
