Creators and developers continually come up with new ways to enhance apps and provide value to users.

One feature that's useful for social media and ecommerce apps in particular is infinite scroll. It provides a seamless and intuitive browsing experience by reducing the time it takes to see new content.

This article will teach you how to implement infinite scroll in a Next.js app using JavaScript’s Intersection Observer API.

Infinite scroll is a web design technique that allows your website or app to load more content as a user scrolls down.

For example, suppose your website has many items to display (such as a news feed or product listing). This technique eliminates the need to click through many pages, allowing users to explore and discover new content easily.

It also helps to improve the user experience by reducing the time it takes to load new pages since the content loads dynamically as the user scrolls.

You can implement it in your project using JavaScript’s Intersection Observer API.

This browser-based API allows you to observe changes in your app’s viewport or a specific intersection between elements.

It works for use cases like lazy-loading, smooth animation transition, and infinite scrolling. You can use this API to detect when certain elements appear on your screen and trigger a function to make changes to the app.

The complete demo for this article is available on 

. You can also check out its source code on 

To smoothly follow along, you will need these first:

 to generate the starter code and store your code remotely. You also need 

 installed on your computer. You need to have 

 installed on your computer, which comes with 

, while not required, will give you an edge and help you understand this article better.

, the CSS framework used in this project. Also not strictly required.

 to generate the starter files for this project in your preferred browser:

After generating the repo, copy its Git URL so you can clone it to your PC:

In your PC’s terminal, run the command below to clone your repo:

After successfully cloning the project, install dependencies by running the command below in your project’s terminal:

yarn # or npm install. But for this demo, yarn is preferred

On completion, run yarn dev in your project’s terminal, and navigate to localhost:3000 on your browser to see the starter UI:

For this project, you will get tea images from Unsplash via its public API. So navigate to 

 and click on “Register as a developer” or “Login” if you have an Unsplash account:

On successful login, click “Your apps” and “New Application”. Accept the terms of the agreement, then fill out your app’s name and description:

After successfully creating your app on Unsplash, scroll down to copy your Access Key.

Open your project in your preferred code editor and create a .env.local file in its root folder to store your Access Key:

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