Building a Theme Toggler with useContext

🌗 Building a Theme Toggler with useContext in React

React's useContext hook is perfect for managing global state like a dark/light theme toggle.


🧠 What is useContext?

useContext allows you to share values (like a theme) between components without passing props manually at every level.


🛠️ Step-by-Step: Build the Theme Toggler

1. Create the Theme Context

jsx

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// ThemeContext.js

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


export const ThemeContext = createContext();


export const ThemeProvider = ({ children }) => {

  const [theme, setTheme] = useState('light');


  const toggleTheme = () => {

    setTheme((prevTheme) => (prevTheme === 'light' ? 'dark' : 'light'));

  };


  return (

    <ThemeContext.Provider value={{ theme, toggleTheme }}>

      {children}

    </ThemeContext.Provider>

  );

};

2. Wrap Your App with the Theme Provider

jsx

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// App.js

import React from 'react';

import { ThemeProvider } from './ThemeContext';

import Home from './Home';


function App() {

  return (

    <ThemeProvider>

      <Home />

    </ThemeProvider>

  );

}


export default App;

3. Consume Context in a Component

jsx

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// Home.js

import React, { useContext } from 'react';

import { ThemeContext } from './ThemeContext';


function Home() {

  const { theme, toggleTheme } = useContext(ThemeContext);


  const style = {

    backgroundColor: theme === 'light' ? '#ffffff' : '#333333',

    color: theme === 'light' ? '#000000' : '#ffffff',

    height: '100vh',

    display: 'flex',

    flexDirection: 'column',

    alignItems: 'center',

    justifyContent: 'center'

  };


  return (

    <div style={style}>

      <h1>{theme.toUpperCase()} MODE</h1>

      <button onClick={toggleTheme}>Toggle Theme</button>

    </div>

  );

}


export default Home;

🧪 Try It Out

When you click the Toggle Theme button, the theme switches between light and dark using useContext.


✅ Key Points

useContext simplifies global state sharing.


Contexts are great for theme, language, user auth, etc.


Keep context providers near the top of your app for full access.


Would you like to add theme persistence with localStorage, or style it with Tailwind or CSS modules next?

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