Dynamic route segments in NextJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a dynamic route segment in Next.js?

A dynamic route segment is a part of a URL path that can change and is defined using square brackets in the folder name, like [id]/page.js. It allows pages to handle different values dynamically.

beginner

How do you define a dynamic route segment for a user profile page with user ID in Next.js?

Create a file named app/users/[userId]/page.js. The [userId] part is the dynamic segment that captures the user ID from the URL.

intermediate

How can you access the value of a dynamic route segment inside a Next.js page component?

In Next.js App Router, use the <code>params</code> object passed to the page component. For example, <code>function Page({ params }) { const userId = params.userId; }</code>.

intermediate

What is the difference between a dynamic route segment and an optional catch-all route in Next.js?

A dynamic route segment matches one part of the URL (e.g., [id]), while an optional catch-all route (e.g., [[...slug]]) can match zero or more parts, allowing flexible URL depths.

beginner

Why are dynamic route segments useful in building web applications?

They let you create pages that respond to different data or user input without making separate files for each URL, like showing different user profiles or blog posts dynamically.

How do you name a file to create a dynamic route segment for a product ID in Next.js App Router?

A productId.js

B product/[id].js

C [productId]/page.js

D productId/page.js

Dynamic route segments use square brackets around the segment name, so [productId]/page.js is correct.

In Next.js, how do you access the dynamic segment value inside a page component?

A Using <code>getStaticProps</code>

B Using the <code>params</code> object passed as a prop

C Using <code>window.location</code>

D Using <code>useState</code> hook

In the App Router, dynamic segment values are available in the params object passed to the page component.

What does the file name [[...slug]]/page.js represent in Next.js routing?

A An optional catch-all route matching zero or more segments

B A static route named 'slug'

C A dynamic segment matching exactly one segment

D A route that matches only the root URL

Double square brackets with three dots create an optional catch-all route that matches zero or more URL segments.

Which folder structure correctly creates a dynamic route for blog posts by slug in Next.js App Router?

A app/blog/[slug].js

B app/blog/slug/page.js

C app/blog/slug.js

D app/blog/[slug]/page.js

Dynamic segments must be folders with square brackets containing the segment name, so app/blog/[slug]/page.js is correct.

Why should you use dynamic route segments instead of creating many static pages?

A To handle many similar pages with one template dynamically

B To make the app slower

C To avoid using React components

D To disable routing

Dynamic route segments let you use one page template to handle many URLs with different data, making development easier and efficient.

Explain how dynamic route segments work in Next.js and how you use them to create pages that respond to different URL values.

Think about how you make a page that shows different content based on the URL.

Describe the difference between a single dynamic route segment and an optional catch-all route in Next.js routing.

Consider how flexible the URL matching is for each type.