JSPM

Persistent, Real-Time Storage for React – No State Management Needed Automatically sync local storage across components, tabs, and sessions with ease.

🚀 Features

• 🔄 Real-time Sync – Watch and react to local storage changes instantly across components.
• 💾 Persistent State – Data remains intact across page reloads and sessions.
• ⚡ Lightweight & Fast – No dependencies, minimal overhead.
• 🛠 Simple API – Get, set, and reset to changes effortlessly.
• 📡 Cross-Tab Communication – Sync updates across different tabs/windows.
• 🚫 No External State Management – Eliminate the need for Redux, Context API, or Zustand.

🔒 Security & Provenance

This package is published with NPM package provenance, which provides cryptographic proof that this package was built from the source code in this repository using the GitHub Actions workflow.

To verify the provenance of this package:

npm audit signatures

This will verify that the package was signed by the trusted GitHub Actions environment and matches the source code in this repository.

📦 Getting Started

Installation

Install via your preferred package manager:

# npm
npm install create-ls

# yarn
yarn add create-ls

# pnpm
pnpm add create-ls

# bun
bun add create-ls

Basic Usage

"use client";

import { createLS } from "create-ls";

const Page: React.FC = () => {
  const counter = createLS("count", 0);

  return (
    <div>
      <h1>Count: {counter.get()}</h1>
      <button onClick={() => counter.set(counter.get() + 1)}>
        Increment by 1
      </button>
    </div>
  );
};

export default Page;

🔍 API Reference

createLS<T>(key: string, initialValue?: T)

A React hook for reading and updating local storage with real-time sync.

Parameters

• key (string): The key under which the value is stored in local storage.
• initialValue (T, optional): The initial value to set if the key does not exist in local storage. If not provided, the value will be an empty string if the key does not exist.

Returns

• An object with the following properties:
  • get: A function to retrieve the current value from local storage.
  • set: A function to update the value in local storage and trigger re-renders.
  • reset: A function to reset the value in local storage to the initial value.
  • hasValue: A boolean indicating whether the key exists in local storage.

get()

A function to retrieve the current value from local storage.

Returns

• The current value stored in local storage for the specified key.

set(value: T)

A function to update the value in local storage and trigger re-renders.

Parameters

• value (T): The new value to set in local storage.

Returns

• void

reset()

A function to reset the value in local storage to the initial value.

Returns

• void

hasValue()

A boolean indicating whether the key exists in local storage.

Returns

• boolean: true if the key exists in local storage, false otherwise.

💡 Examples

Using all methods

"use client";

import { createLS } from "create-ls";

const Page: React.FC = () => {
  const counter = createLS("count", 0);

  return (
    <div>
      {counter.hasValue() ? (
        <h1>Count: {counter.get()}</h1>
      ) : (
        <h1>Click the button to set the count</h1>
      )}
      <button onClick={() => counter.set(counter.get() + 1)}>
        Increment by 1
      </button>
      <button onClick={() => counter.reset()}>Reset Count</button>
    </div>
  );
};

export default Page;

Using Multiple Local Storage Keys

"use client";

import { createLS } from "create-ls";

const Page: React.FC = () => {
  const counter1 = createLS("count1", 0);
  const counter2 = createLS("count2", 0);

  return (
    <div>
      <h1>Count 1: {counter1.get()}</h1>
      <h1>Count 2: {counter2.get()}</h1>
      <button onClick={() => counter1.set(counter1.get() + 1)}>
        Increment Count 1 by 1
      </button>
      <button onClick={() => counter2.set(counter2.get() + 1)}>
        Increment Count 2 by 1
      </button>
    </div>
  );
};

export default Page;

🛠 Contributing

Contributions are welcome! To contribute:

1. Fork the repository.
2. Create a feature branch.
3. Commit your changes.
4. Open a Pull Request.

📜 License

This project is licensed under the MIT License - see the LICENSE file for details.

👨‍💻 Created By

This package is developed and maintained by JP.Coffee. Feel free to reach out or open an issue for any questions or suggestions!