Introduction

Purpose

This page introduces Nrgy.js at the product level before the reader moves into the API and architectural sections.

What Nrgy.js Is

Nrgy.js is a library for separating business logic and state from UI, built on a reactive core with controllers and MVVM/MVC patterns.

At a high level, Nrgy.js combines:

• a reactive core for state, derivations, and effects
• explicit lifecycle and cleanup through scopes and destroy points
• controllers and view models as feature-level logic boundaries
• thin and replaceable UI integrations

What Problem It Solves

Nrgy.js helps solve a specific class of problems:

• keeping business logic independent from UI
• reusing the same feature logic across several views
• making lifecycle and cleanup explicit and controllable
• integrating feature logic with React and dependency injection

It is useful when an application starts to outgrow component-local state and ad hoc side effects.

Reading Path

If you are new to Nrgy.js, read the documentation in this order:

1. Read Quick Start.
2. Continue with Core.
3. Then move to MVVM and Controllers.
4. After that read Architecture and Integrations.
5. Use Recipes, Migration, and FAQ as needed.