Q1. What are Route Handlers and how do they differ from API Routes?
Route Handlers live in app/api/.../route.ts and export HTTP-method functions such as GET, POST, PUT, DELETE and PATCH. They receive a standard Request and return a Respon...
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Q2. What is API Routes in Next.js?
A feature to create API endpoints in the `pages/api` or `app/api` directory. It allow you to create custom request handlers for a given route using the Web Request and Re...
Q3. How do you create API endpoints in Next.js?
Next.js provides built-in serverless backend capabilities for creating REST or GraphQL endpoints: ### 1. In App Router (Route Handlers - Modern): Create a `route.ts` (or ...
Q4. How do you handle CORS in Next.js API routes?
By setting appropriate headers in the API route response. ```js export default function handler(req, res) { res.setHeader("Access-Control-Allow-Origin", "*"); res.setHead...
Q5. Prevent API routes from being accessed by the client?
To prevent API routes from being accessed by the client, you can implement authentication and authorization checks in your API route handlers. This ensures that only auth...
Q6. How do you use the Edge Runtime for API routes?
You can opt into the Edge Runtime to run API routes on the V8/edge environment. Add `export const runtime = "edge";` at the top of a route handler and use the Web `Reques...
Q7. How can you implement simple rate limiting for API routes?
For basic protection you can use an in-memory store (suitable for single-instance apps) or a shared store (Redis) for multiple instances. Example memory-based limiter usi...
Q8. How do you handle API routes in the Next.js Pages Router?
By creating files in the `pages/api` directory, which will be treated as API endpoints. ```jsx // pages/api/hello.js export default function handler(req, res) { res.statu...
Q9. What is the fetch API in Next.js App Router?
In the Next.js App Router, you can use the `fetch` API to make HTTP requests to external APIs or your own API routes. The `fetch` function is available globally in both s...
Q10. What are route handlers vs API routes in App Router?
In the App Router, API routes are now called "Route Handlers" and use the `route.js` file convention instead of the pages-based approach. **Pages Router (API Routes)**: `...