vanilla-js-architect

Structure a vanilla JavaScript application by separating concerns into Core, UI, App, and Data layers. This framework-agnostic architecture keeps pure logic modular, improves testability, and enables scalable frontend code without tooling dependencies.

The best way to write testable frontend code without a framework is prioritizing pure functions with explicit inputs and outputs. This approach decouples business logic from DOM rendering, allowing you to easily unit test core behaviors independently.

Separate business logic from DOM rendering by dividing vanilla JS apps into Core and UI layers. Core handles pure logic and state, while UI strictly manages DOM updates and rendering, orchestrated by an App layer for clean separation of concerns.

Yes, you can use JSDoc for typing in a modular vanilla JavaScript architecture. JSDoc provides approachable type safety and code hinting, easing developer onboarding and facilitating future migration to frameworks without requiring a compile step.

Yes, this vanilla JavaScript architecture pattern works for small-to-medium web apps. It provides practical patterns and example components to build maintainable applications without tooling, while preserving clear separation of concerns and testability.

Rely on vanilla JS architecture when building small-to-medium web apps where you need maintainability and testability without the overhead of framework tooling. It provides a disciplined structure that eases future framework migration if requirements scale.