What to know about local storage and browser APIs in JavaScript
The browser exposes APIs for storing state, handling dates, interacting with location, and saving user preferences. This chapter explains the concept, demonstrates a practical example, and gives you a guided exercise.
How to use local storage and browser APIs in JavaScript
Start with a small function, make inputs and outputs explicit, and test both normal and edge cases. Use browser developer tools to inspect values and errors as you build.
Example: local storage and browser APIs in JavaScript
Use this example as a starting point. Identify the part that controls the result, then adapt it to your own page or project.
localStorage.setItem("theme", "dark");
const theme = localStorage.getItem("theme");Common questions about local storage and browser APIs
When should I use local storage and browser APIs?
Use this technique when it expresses the structure, styling, or behavior your page needs. Keep the implementation focused and test it with the surrounding content.
What should I practice next?
Build one small interaction that reads a value, validates it, updates the page, and handles an empty or invalid input.
Practice local storage and browser APIs
Build one small interaction that reads a value, validates it, updates the page, and handles an empty or invalid input. Compare your result with the example and check it at both desktop and mobile widths where relevant.
Course progress stays in this browser.