Intercepting Routes — Complete Guide
Intercepting Routes — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Next.js Tutorial on Toolliyo Academy.
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Next.js Tutorial (LearnHub) · Lesson 36 of 100
Intercepting Routes
Beginner ✓ → Intermediate → Advanced → Professional
Intermediate · 2 — Building apps · ~14 min read · Module 4: Auth & APIs
Introduction
You know the basics now. Here we use Intercepting Routes in real LearnHub screens — layouts, data, and APIs. Still plain language, just a bit more depth. Intercepting Routes helps you build or consume HTTP APIs in LearnHub — Route Handlers, caching, or client libraries. Mobile apps, webhooks, and partner integrations need JSON endpoints alongside your pages.
Route Handlers are how LearnHub talks to webhooks and mobile clients. Get JSON responses solid here.
When will you use this?
Use Route Handlers when a mobile app, webhook, or external client needs JSON from your server.
- Mobile apps and partner sites call your Next.js Route Handlers for JSON over HTTP.
- Webhook endpoints for payment providers live in app/api routes.
Real-world: Swiggy-style delivery tracker
The Food tech team building Swiggy-style delivery tracker uses Intercepting Routes to apply Intercepting Routes when building live order map and status updates. customers and riders never see the TypeScript files — they just get a fast, reliable live order map and status updates.
Production-style code
// app/api/example/route.ts
import { NextResponse } from 'next/server';
export async function GET() {
return NextResponse.json({ topic: 'Intercepting Routes' });
}What happens in production: In Swiggy-style delivery tracker, getting Intercepting Routes right means customers and riders trust the live order map and status updates every day.
Lesson example (start here)
Copy this smaller example first. Once it works, compare it with the real-world code above.
// app/api/example/route.ts
import { NextResponse } from 'next/server';
export async function GET() {
return NextResponse.json({ topic: 'Intercepting Routes' });
}Line-by-line walkthrough
| Code | What it means |
|---|---|
// app/api/example/route.ts | Comment — notes for humans; the compiler ignores it. |
import { NextResponse } from 'next/server'; | Imports a module so you can use its exports in this file. |
export async function GET() { | Exported async function — often a Server Action or API handler. |
return NextResponse.json({ topic: 'Intercepting Routes' }); | Next.js helpers for Route Handlers — read request and return JSON or redirects. |
} | Closes a block started by { above. |
How it works (big picture)
- Study the example line by line.
- Each part connects to Intercepting Routes.
- Edit one line, save, run npm run dev, and see what changes.
Do this on your computer
- Add or update a route handler or fetch call.
- Test with browser, curl, or Thunder Client.
- Check status codes and JSON shape match the lesson.
- Read the real-world section and name which part of LearnHub uses this topic.
- Run the example locally with npm run dev and confirm the same behavior.
- Change one value in the example (route, text, or course id) and predict what will happen before you save.
Experiments — try changing this
- Change a string or route in the example and save — watch the browser update.
- Break the code on purpose (remove a bracket), read the error overlay, then fix it.
- Change the API URL or course id and see how the page data changes.
- Use npm run dev while editing Intercepting Routes — the page hot-reloads on save.
Remember
You learned what Intercepting Routes is and when to use it in LearnHub. Practice by changing the example yourself. Use the Next link when you can explain it in your own words.
Common questions
What is Intercepting Routes?
Intercepting Routes is explained in the introduction above — read it in plain language first.
How long should I spend on Intercepting Routes?
Until you can explain it in your own words and run the example without looking at the answer. Beginners often need 30–60 minutes per new concept; setup lessons may take one afternoon.
What if I get stuck on Intercepting Routes?
Re-read the line-by-line walkthrough, check the terminal and browser overlay for errors, and compare your code character-by-character with the example. Search the exact error text — someone else had it too.
Where is Intercepting Routes used in real jobs?
See the real-world section above — the same pattern appears in LMS, e-commerce, SaaS, and dashboards. Interviewers ask you to explain it using one concrete example.