What is React Router? React Router is the standard library for routing in React applications. It enables navigation between different components or views without full page reloads, helping build single-page
Answer: pplications (SPA). Declarative routing: Allows you to define routes using JSX. Dynamic routing: Routes can be dynamically rendered based on the state, props, or URL.
What interviewers expect
- A clear definition tied to React in React.js projects
- Trade-offs (performance, maintainability, security, cost)
- When you would and would not use it in production
Real-world example
In a production React.js application, teams apply this when handling user-facing features or integration boundaries. For example, you might use it during a sprint where reliability and observability matter—logging metrics, validating edge cases, and documenting the decision in an ADR so future developers understand why the approach was chosen.
How to explain in the interview
- Define the concept in one or two sentences.
- Context — where it fits in React.js architecture.
- Example — a specific project, bug, or performance win.
- Trade-off — what you gain vs what you sacrifice.
Tip: Practice aloud on Toolliyo mock interview or the Interview Q&A section before your real interview.