Why Parallel routes concept in NextJS? - Purpose & Use Cases

The Big Idea

What if your page could update multiple sections at once, without any messy code?

The Scenario

Imagine building a website where you want to show a sidebar menu and main content side by side, but each part needs to update independently without reloading the whole page.

The Problem

Manually managing this means writing complex code to track which parts changed, updating only those, and handling all the loading states yourself. It gets messy and hard to maintain.

The Solution

Next.js parallel routes let you define multiple routes that render different parts of the page at the same time, so each section updates smoothly and independently without extra hassle.

Before vs After

✗ Before

if (sidebarChanged) { updateSidebar(); } if (contentChanged) { updateContent(); }

✓ After

export const parallelRoutes = { sidebar: SidebarRoute, content: ContentRoute };

What It Enables

This makes building complex layouts with independently updating sections simple, fast, and clean.

Real Life Example

Think of an email app where the inbox list updates separately from the email reading pane, so you can keep reading while new emails load in the list.

Key Takeaways

Manual updates for multiple page parts are complicated and error-prone.

Parallel routes let you split page areas into independent routes that load together.

This leads to smoother user experiences and easier code management.