Why this lesson matters

Understand route groups and use it correctly in an App Router project. Dynamic segments, route groups and Link navigation let a route tree express changing identifiers and organizational structure without hard-coding navigation behavior.

How to reason about it

  • For Route Groups, the outcome to verify is: A route group organizes files without adding a URL segment.
  • In Route Groups, keep this failure controlled: Using raw anchor URLs everywhere or trusting an unchecked dynamic parameter can break transitions and pass unsafe values into data queries.
  • Route Groups practice target: Create a dynamic product route inside a route group and navigate to it with Link after validating the identifier.

Practical walkthrough

In the Route Groups walkthrough: A route group organizes files without adding a URL segment.

app-tree.txttext
app/
  (marketing)/page.tsx
  (dashboard)/dashboard/page.tsx
  layout.tsx

Practice it yourself

Practice

Route Groups exercise

Create a dynamic product route inside a route group and navigate to it with Link after validating the identifier.

  • Record the expected result before execution
  • Test one valid path and one lesson-specific failure path
  • Explain in two lines which boundary owns the decision

Summary