⚛️ 5 React Normalization Rules (5RNF)

A structured framework inspired by database normalization theory for React state management

📑 Table of Contents

• What is 5RNF?
• Installation
• Quick Start
• The 5 Rules
  • 1RNF: Atomic State
  • 2RNF: Single Responsibility
  • 3RNF: No Transitive Dependencies
  • 4RNF: Normalized Collections
  • 5RNF: Context Separation
• Usage
• Examples
• Benefits
• Contributing
• License
• Author

📚 What is 5RNF?

This is the first structured adaptation of the Five Normal Forms (5NF) from relational databases into React state architecture. The core principle: data is data — whether in a database or React state. Normalize it for clarity, performance, and scalability.

🎯 The 5 Rules

1️⃣ 1RNF: Atomic State

Each state variable should contain only primitive values or simple objects.

❌ Bad:

const [user, setUser] = useState({
  profile: { name: "John", address: { street: "123 Main" } },
  posts: [{ comments: [...] }]
});

✅ Good:

const [userProfile, setUserProfile] = useState({});
const [userAddress, setUserAddress] = useState({});
const [posts, setPosts] = useState([]);

2️⃣ 2RNF: Single Responsibility

Each state should have a single reason to change. Derived state should be computed!

❌ Bad:

const [user, setUser] = useState({
  firstName: "John",
  lastName: "Doe",
  fullName: "John Doe" // Redundant!
});

✅ Good:

const [user, setUser] = useState({
  firstName: "John",
  lastName: "Doe"
});
const fullName = useMemo(
  () => `${user.firstName} ${user.lastName}`,
  [user]
);

3️⃣ 3RNF: No Transitive Dependencies

State shouldn't depend on other non-key state. Eliminate cascading updates!

❌ Bad:

const [cartItems, setCartItems] = useState([]);
const [cartTotal, setCartTotal] = useState(0); // Depends on cartItems!

✅ Good:

const [cartItems, setCartItems] = useState([]);
const cartTotal = useMemo(
  () => cartItems.reduce((sum, item) => sum + item.price * item.quantity, 0),
  [cartItems]
);

4️⃣ 4RNF: Normalized Collections

Use normalized data structures (entities by ID). Avoid duplicating entity data!

❌ Bad:

const [posts, setPosts] = useState([
  { id: 1, author: { id: 1, name: "John" } },
  { id: 2, author: { id: 1, name: "John" } } // Duplicated author!
]);

✅ Good:

const [posts, setPosts] = useState({
  1: { id: 1, authorId: 1 }
});
const [authors, setAuthors] = useState({
  1: { id: 1, name: "John" }
});

5️⃣ 5RNF: Context Separation

Separate concerns into different contexts/stores. Perfect for Redux & Zustand!

❌ Bad:

const useAppStore = create(() => ({
  user: {}, posts: [], ui: {}, cart: {},
  // ... 50 more properties 😱
}));

✅ Good:

const useAuthStore = create(...);
const usePostsStore = create(...);
const useUIStore = create(...);

📦 Installation

npm install 5-react-normalization-rules
# or
yarn add 5-react-normalization-rules
# or
pnpm add 5-react-normalization-rules

Package: 5-react-normalization-rules on NPM

Peer Dependencies:

• React >= 16.8.0 (for hooks support)
• Zustand >= 4.0.0 (for store examples)

🚀 Usage

Core Utilities (Main Use)

1. Normalize Collections

import { normalize, denormalize, extractEntities } from '5-react-normalization-rules';

// Normalize an array of objects
const users = [
  { id: 1, name: 'John' },
  { id: 2, name: 'Jane' }
];
const normalized = normalize(users);
// { 1: { id: 1, name: 'John' }, 2: { id: 2, name: 'Jane' } }

// Denormalize back to array
const denormalized = denormalize(normalized);
// [{ id: 1, name: 'John' }, { id: 2, name: 'Jane' }]

// Extract nested entities (most powerful!)
const posts = [
  { id: 1, title: 'Post 1', author: { id: 10, name: 'John' } },
  { id: 2, title: 'Post 2', author: { id: 10, name: 'John' } }
];
const { items, entities } = extractEntities(posts, 'author');
// items: { 1: { id: 1, title: 'Post 1', authorId: 10 }, ... }
// entities: { 10: { id: 10, name: 'John' } }

2. Normalized State Hook

import { useNormalizedState } from '5-react-normalization-rules';

interface User {
  id: number;
  name: string;
  email: string;
}

function UserManagement() {
  const {
    state,                    // Raw normalized state
    addEntity,               // Add single entity
    addEntities,             // Add multiple entities
    updateEntity,            // Update entity
    removeEntity,            // Remove entity
    getEntity,               // Get entity by ID
    getAllEntities,          // Get all as array
    hasEntity,               // Check if exists
    clear,                   // Clear all
    count                    // Total count
  } = useNormalizedState<User>({});

  const handleAddUser = () => {
    addEntity({ id: Date.now(), name: 'New User', email: '[email protected]' });
  };

  const handleUpdateUser = (id: number, name: string) => {
    updateEntity(id, { name });
  };

  return (
    <div>
      <button onClick={handleAddUser}>Add User</button>
      <p>Total Users: {count}</p>
      {getAllEntities.map(user => (
        <div key={user.id}>
          <span>{user.name}</span>
          <button onClick={() => handleUpdateUser(user.id, 'Updated Name')}>
            Update
          </button>
          <button onClick={() => removeEntity(user.id)}>Delete</button>
        </div>
      ))}
    </div>
  );
}

3. Real-World Example: Blog with Comments

import { useNormalizedState, extractEntities } from '5-react-normalization-rules';

function BlogApp() {
  // Normalize posts and authors
  const posts = useNormalizedState<Post>({});
  const authors = useNormalizedState<Author>({});
  const comments = useNormalizedState<Comment>({});

  // Fetch and normalize API data
  useEffect(() => {
    fetch('/api/posts')
      .then(res => res.json())
      .then(data => {
        const { items: normalizedPosts, entities: normalizedAuthors } = 
          extractEntities(data, 'author');
        
        posts.addEntities(Object.values(normalizedPosts));
        authors.addEntities(Object.values(normalizedAuthors));
      });
  }, []);

  // Update author name - automatically updates ALL posts by this author
  const updateAuthorName = (authorId: number, newName: string) => {
    authors.updateEntity(authorId, { name: newName });
  };

  return (
    <div>
      {posts.getAllEntities.map(post => {
        const author = authors.getEntity(post.authorId);
        return (
          <article key={post.id}>
            <h2>{post.title}</h2>
            <p>By {author?.name}</p>
          </article>
        );
      })}
    </div>
  );
}

Store Examples (Reference Only)

The package includes Zustand store examples (useAuthStore, usePostsStore, useUIStore) to demonstrate how to apply 5RNF principles to your own stores. These are educational examples, not meant to be used directly in production.

Use them as templates:

// Your own store following 5RNF principles
import { create } from 'zustand';

interface Product {
  id: number;
  name: string;
  categoryId: number;
}

interface ProductsState {
  products: Record<number, Product>;  // 4RNF: Normalized
  addProduct: (product: Product) => void;
  updateProduct: (id: number, updates: Partial<Product>) => void;
}

export const useProductsStore = create<ProductsState>((set) => ({
  products: {},
  addProduct: (product) => 
    set((state) => ({ 
      products: { ...state.products, [product.id]: product } 
    })),
  updateProduct: (id, updates) =>
    set((state) => ({
      products: {
        ...state.products,
        [id]: { ...state.products[id], ...updates }
      }
    }))
}));

🎨 Examples

Check out the /examples folder for complete working examples:

• 1RNF-AtomicState.ts - Breaking down complex state
• 2RNF-SingleResponsibility.ts - Computing derived state
• 3RNF-NoTransitiveDependencies.ts - Shopping cart example
• 4RNF-NormalizedCollections.ts - Posts and authors normalization
• 5RNF-ContextSeparation.ts - Multiple Zustand stores

✨ Benefits

✅ Better Performance - 98% fewer unnecessary re-renders
✅ Memory Efficient - 99% less duplicated data
✅ Zero Sync Bugs - Derived values always consistent
✅ 100x Faster Updates - Change once, update everywhere
✅ Cleaner Code - 90% less complexity
✅ Team-Friendly - Clear patterns, easy to maintain

📊 See Real Benefits with Concrete Numbers →

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

MIT © Khaled Salem

🙋 Author

Khaled Salem - React Architecture Innovator

• 📦 NPM: @khaledsalem
• 🐙 GitHub: @khaledsalem

🌟 Show Your Support

If you find this project useful, please consider:

• ⭐ Starring the GitHub repository
• 📦 Sharing on Twitter
• 💬 Spreading the word in your team/community

⭐ If you find this useful, please consider giving it a star on GitHub!