Premium

Angular Theme Toggle with Persisted Light/Dark Mode

By FrontendAtlas Team · Updated Jan 30, 2026

Implement an Angular light/dark theme toggle with persistence. Store the theme in localStorage, apply it to the root element, and keep the toggle label/icon in sync across reloads and new sessions. Concepts: components, services, dependency-injection. Angular focus: use a ThemeService to persist theme and apply…

  • Render a main page layout with a simple content card and a…
  • Support two themes: "light" and "dark".

Challenge preview

Angular Theme Toggle with Persisted Light/Dark Mode: Implement an Angular light/dark theme toggle with persistence. Store the theme in localStorage, apply it to the root element, and keep the toggle label/icon…. Expect components and services decisions under intermediate level constraints.

Premium unlocks

  • Full editor workflow with starter files, tests, and solution context.
  • Edge cases, common mistakes, and complexity notes for the interview discussion.
  • Progress tracking once you unlock and complete the challenge.

Free warm-up options

Upgrade to FrontendAtlas Premium to unlock this challenge. Already upgraded? Sign in to continue.