---
title: "Build a Persistent Light / Dark Theme in React"
url: https://daily.dev/posts/build-a-persistent-light-dark-theme-in-react-5hbpejx38
source_url: https://medium.com/javarevisited/build-a-persistent-light-dark-theme-in-react-a10e1c8b220f
type: article
source: "Javarevisited"
author: "Mouad Oumous"
published: 2025-12-05T15:34:20.093Z
updated: 2025-12-06T12:00:11.302Z
tags: ["webdev", "javascript", "react", "css", "frontend"]
reading_time: 6
upvotes: 4
comments: 0
language: en
---

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# Build a Persistent Light / Dark Theme in React

**[Javarevisited](https://daily.dev/sources/javarevisited)** · [@mouadoumous](https://daily.dev/mouadoumous) · 6 min read · 4 upvotes · 0 comments

## Summary

Learn how to implement a persistent light/dark theme toggle in React using a custom useLocalStorage hook and CSS variables. The solution stores user preferences in localStorage for persistence across page reloads, uses CSS custom properties for clean theme switching via data attributes, and includes a reusable hook pattern that can be applied to other persistent settings. The implementation features lazy initialization for performance, smooth transitions, and a maintainable architecture that separates concerns between React state management and CSS styling.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://medium.com/javarevisited/build-a-persistent-light-dark-theme-in-react-a10e1c8b220f>

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---

Tags: [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript), [#react](https://daily.dev/tags/react), [#css](https://daily.dev/tags/css), [#frontend](https://daily.dev/tags/frontend)

[View this post on daily.dev](https://daily.dev/posts/build-a-persistent-light-dark-theme-in-react-5hbpejx38)