Why Cursor-based pagination in Rest API? - Purpose & Use Cases

The Big Idea

Discover how a simple marker can make endless scrolling smooth and error-free!

The Scenario

Imagine you have a huge list of items, like thousands of products in an online store. You want to show them page by page to users. If you try to load all items at once or jump to a random page by counting items, it gets slow and confusing.

The Problem

Using simple page numbers means the server must count or skip many items each time. This makes the app slow and can show wrong or repeated items if the list changes while you browse. It's like flipping pages in a book that keeps changing its content.

The Solution

Cursor-based pagination uses a unique marker (cursor) from the last item you saw to get the next items. This way, the server quickly finds where to continue without counting or skipping. It keeps the list stable and fast, even if new items are added or removed.

Before vs After

✗ Before

GET /items?page=5&limit=10

✓ After

GET /items?cursor=abc123&limit=10

What It Enables

It enables smooth, fast, and reliable browsing through large or changing lists without missing or repeating items.

Real Life Example

When you scroll through your social media feed, cursor-based pagination helps load new posts seamlessly without jumping or repeating posts, even as new content is added constantly.

Key Takeaways

Manual page numbers slow down with big or changing data.

Cursors mark where to continue, making loading faster and stable.

Cursor-based pagination improves user experience on large lists.