cookie-checker-js

A lightweight utility to parse and retrieve cookie values in JavaScript (browser) environments. Useful for checking if specific cookies exist and extracting their values from document.cookie.

📦 Installation

npm install cookie-checker-js

Usage

Get a Cookie Value

import { getCookieValue } from "cookie-checker-js";

const token = getCookieValue("authToken");
console.log(token); // "abc123" or null

Check if Cookie Key Exists

import { hasCookieKey } from "cookie-checker-js";

if (hasCookieKey("sessionId")) {
  console.log("Session exists");
} else {
  console.log("Session not found");
}

API Reference

getCookieValue(key: string): string | null

• Retrieves the value of a cookie by name.
• Returns null if the cookie is not present.

hasCookieKey(key: string): boolean

• Checks if a cookie key exists.
• Returns true if present, false otherwise.

How It Works

The utility parses document.cookie and maps it into key-value pairs:

document.cookie => "authToken=abc123; sessionId=xyz789"

It then decodes the keys and values safely and provides a clean interface for retrieval.

Environment Support

• ✅ Browser (frontend JavaScript/TypeScript only)
• ❌ Not for Node.js (see cookie-checker-node for Node.js environments)

📄 License

MIT License

✍️ Author

Developed by Utkarsh. Designed for simplicity and usability in real-world frontend projects.