#18 React Js Challenge Day 18 | Auth in React Js using useContext

Welcome to Day 18 of the React Js Challenge! In this tutorial, we will learn about implementing authentication in React Js using the useContext hook.

Authentication is a crucial aspect of building web applications. It allows users to securely access restricted content and perform actions based on their identity. React Js provides a powerful tool called useContext that makes it easy to manage and share authentication state across components.

Setting up the Context

To get started, we need to create a context for our authentication state. We can do this by using the createContext function provided by React. Here’s how to create the context:

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

                const AuthContext = createContext();

                const AuthProvider = ({ children }) => {
                    const [isAuthenticated, setIsAuthenticated] = useState(false);

                    const login = () => {
                        // Perform login logic
                        setIsAuthenticated(true);
                    }

                    const logout = () => {
                        // Perform logout logic
                        setIsAuthenticated(false);
                    }

                    return (
                        &ltAuthContext.Provider value={{ isAuthenticated, login, logout }}>
                            {children}
                        &lt/AuthContext.Provider>
                    );
                }

                const useAuth = () => {
                    return useContext(AuthContext);
                }

                export { AuthProvider, useAuth };
            
        

In this example, we create a context called AuthContext using the createContext function. We also define an AuthProvider component that manages the authentication state and provides login and logout functions to update the state. Finally, we define a custom hook useAuth that allows us to consume the authentication state in our components.

Using the Context

Now that we have set up the context, we can use it in our components to handle authentication. Here’s an example of how to use the useContext hook to access the authentication state and login/logout functions:

            
                import React from 'react';
                import { useAuth } from './AuthContext';

                const AuthComponent = () => {
                    const { isAuthenticated, login, logout } = useAuth();

                    return (
                        &ltp>
                            {isAuthenticated ? (
                                &ltbutton onClick={logout}>Logout
                            ) : (
                                &ltbutton onClick={login}>Login
                            )}
                        &lt/p>
                    );
                }

                export default AuthComponent;
            
        

In this example, we use the useAuth hook to access the isAuthenticated state and the login and logout functions provided by the AuthProvider. We then use this information to conditionally render a login or logout button based on the current authentication state.

And that’s it! We have successfully implemented authentication in React Js using the useContext hook. This approach allows us to easily manage and share authentication state across our application, making it a powerful tool for building secure and user-friendly web applications.