Create a Dark Mode Toggle in Vue.js (With Tailwind CSS)

Dark mode has become a standard feature in modern web applications. It improves readability, reduces eye strain, and gives your UI a polished, contemporary feel. With Vue.js and Tailwind CSS, implementing a dark mode toggle is both simple and elegant. Let’s walk through how to set it up.

𝗪𝗵𝘆 𝗨𝘀𝗲 𝗧𝗮𝗶𝗹𝘄𝗶𝗻𝗱 𝗖𝗦𝗦 𝗳𝗼𝗿 𝗗𝗮𝗿𝗸 𝗠𝗼𝗱𝗲?

Tailwind CSS includes built-in dark mode utilities that let you style components effortlessly. By default, Tailwind uses the dark class strategy—meaning when the dark class is added to the html or body tag, all dark-mode-ready styles instantly activate.

𝗦𝗲𝘁𝘁𝗶𝗻𝗴 𝗨𝗽 𝘁𝗵𝗲 𝗣𝗿𝗼𝗷𝗲𝗰𝘁

First, create a Vue.js project:

npm create vue@latest

Install Tailwind CSS:

npm install -D tailwindcss postcss autoprefixer
npx tailwindcss init -p

Enable dark mode by adding this to tailwind.config.js:

darkMode: \'class\',

Now Tailwind is ready to respond to dark mode toggles.

𝗖𝗿𝗲𝗮𝘁𝗶𝗻𝗴 𝘁𝗵𝗲 𝗧𝗼𝗴𝗴𝗹𝗲 𝗟𝗼𝗴𝗶𝗰

In your main App component or Navbar component, add a reactive variable such as isDark. When toggled, you can add or remove the dark class from the html element:

const isDark = ref(false);

watch(isDark, (value) => {
  document.documentElement.classList.toggle(\'dark\', value);
});

This instantly switches all styles across your app.

𝗗𝗲𝘀𝗶𝗴𝗻𝗶𝗻𝗴 𝘁𝗵𝗲 𝗧𝗼𝗴𝗴𝗹𝗲 𝗕𝘂𝘁𝘁𝗼𝗻

Use Tailwind classes to style your toggle:

<button @click=\"isDark = !isDark\" class=\"p-2 rounded-lg bg-gray-200 dark:bg-gray-700\">
  {{ isDark ? \'Light Mode\' : \'Dark Mode\' }}
</button>

You’ll notice how Tailwind’s dark: variants automatically apply the appropriate styling.

𝗘𝗻𝗵𝗮𝗻𝗰𝗶𝗻𝗴 𝘁𝗵𝗲 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲

For better UX:

• Save user preference in localStorage
• Add transition utilities like transition-colors
• Use icons (sun/moon) for visual clarity

With just a few lines of code, you now have a sleek, responsive dark mode toggle powered by Vue.js and Tailwind CSS—giving your app a modern, user-friendly touch.

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