Why Loading UI with loading.tsx in NextJS? - Purpose & Use Cases

The Big Idea

What if your app could tell users it's working without you writing extra loading code everywhere?

The Scenario

Imagine you have a web page that fetches data from the internet. Without a loading UI, users see a blank screen or sudden content jumps, making them wonder if the page is broken or slow.

The Problem

Manually adding loading indicators means writing extra code everywhere you fetch data. It's easy to forget, inconsistent, and can cause flickering or confusing states for users.

The Solution

Using loading.tsx in Next.js lets you automatically show a smooth loading UI while your page or component is fetching data, without extra repetitive code.

Before vs After

✗ Before

if (!data) { return <div>Loading...</div> } return <Content data={data} />

✓ After

export default function Loading() { return <div>Loading...</div> }

What It Enables

This lets your app feel faster and more polished by showing consistent loading states automatically during navigation or data fetching.

Real Life Example

When clicking a link to a new page, instead of a blank screen, users see a friendly loading spinner, so they know the app is working and not stuck.

Key Takeaways

Manual loading UI is repetitive and error-prone.

loading.tsx automates showing loading states in Next.js.

It improves user experience with smooth, consistent feedback.