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nicko
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Beginner
Asked: 2025-02-20T00:57:13+00:00 In:

What is the useId hook?

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An explanation of the useId hook in React.

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  1. Finn Phillips
    Beginner

    The useUserId hook isn’t a built-in React hook but is commonly implemented in applications to fetch or manage the current user’s ID. It’s often a custom hook that helps in managing user authentication or session-related data.

    Let me show you how a typical useUserId hook works and where it’s commonly used. 👇

    1️⃣ Basic Custom useUserId Hook

    A simple hook to manage the user ID, assuming you store it in localStorage or context.

    import { useState, useEffect } from 'react';

const useUserId = () => {
const [userId, setUserId] = useState(null);

useEffect(() => {
// Fetch userId from localStorage or any auth logic
const storedUserId = localStorage.getItem('userId');
if (storedUserId) {
setUserId(storedUserId);
}
}, []);

return userId;
};

export default useUserId;

    Usage:

    import React from 'react';
import useUserId from './useUserId';

const Dashboard = () => {
const userId = useUserId();

return (
<div>
{userId ? <h1>Welcome User: {userId}</h1> : <h1>Loading...</h1>}
</div>
);
};

    2️⃣ Using useUserId with Authentication Providers

    If you’re using Firebase, Auth0, or similar services, useUserId could pull data from their APIs.

    Example with Firebase:

    import { useState, useEffect } from 'react';
import { auth } from './firebase'; // Firebase config

const useUserId = () => {
const [userId, setUserId] = useState(null);

useEffect(() => {
const unsubscribe = auth.onAuthStateChanged((user) => {
if (user) {
setUserId(user.uid); // Firebase user ID
} else {
setUserId(null);
}
});

return () => unsubscribe();
}, []);

return userId;
};

export default useUserId;

    3️⃣ Using useUserId with Context API

    You could also integrate it with React Context for a more global solution.

    Step 1: Create Auth Context

    import React, { createContext, useContext, useState } from 'react';

const AuthContext = createContext();

export const AuthProvider = ({ children }) => {
const [userId, setUserId] = useState('user_123'); // Example userId

return (
<AuthContext.Provider value={{ userId, setUserId }}>
{children}
</AuthContext.Provider>
);
};

export const useAuth = () => useContext(AuthContext);

    Step 2: Create the useUserId Hook

    import { useAuth } from './AuthContext';

const useUserId = () => {
const { userId } = useAuth();
return userId;
};

export default useUserId;

    Step 3: Use It Anywhere

    import useUserId from './useUserId';

const Profile = () => {
const userId = useUserId();

return <div>User ID: {userId}</div>;
};

    🔥 Why Use a useUserId Hook?

    1. DRY Principle: Centralizes the logic to get the user ID.
    2. Flexibility: Can be extended to fetch more user data (like name or roles).
    3. State Management: Integrates with Redux, Context, or even SWR/React Query.