🚗 Express REST API

Chapter: Node.js & Express — Backend APIs · Level ★★★ · Time: 20 min

SCORE___ / 20

NameClassDate

After this worksheet you can

Define Express routesWrite full CRUD handlersUse middlewareChoose correct status codes

📚 Quick Recap

🎯 What you'll practice: Express routes, middleware, and CRUD with proper status codes.

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

5A resource not found should respond with status .

6req. contains the parsed JSON body of a POST request.

7Write a GET route for "/api/courses/:id" that returns 404 if not found.

8Write a DELETE route for "/api/courses/:id" that responds with 204.

9Why is app.use(express.json()) required before routes can read req.body?

🚀 Section C · Challenge ● CHALLENGE 5

10Design full CRUD routes for a "notes" resource (in-memory array): list, get one, create, update, delete. Write all 5 routes.

💭 Reflection — the most useful thing I learned:

A ___/4 B ___/11 C ___/5 Total ___/20 Teacher's Signature Parent's Signature

✂ answer key — fold or cut before handing out

1-B 2-C 3-B 4-B | 5 = 404 6 = body 7 = app.get('/api/courses/:id',(req,res)=>{const c=courses.find(x=>x.id===Number(req.params.id));if(!c)return res.status(404).json({error:'Not found'});res.json(c);}); 8 = app.delete('/api/courses/:id',(req,res)=>{courses=courses.filter(x=>x.id!==Number(req.params.id));res.status(204).send();}); 9 = Because Express doesn't parse the request body by default — express.json() middleware reads the raw incoming stream and populates req.body before any route handler runs | 10 = GET /api/notes (list), GET /api/notes/:id (one), POST /api/notes (create, 201), PUT /api/notes/:id (update), DELETE /api/notes/:id (delete, 204) — each following the same array find/filter pattern as the course example.

📄 Need offline practice?Print this worksheet or open the one-page cheat sheet.

🗒 Cheat Sheet

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

🚀 Section C · Challenge ● CHALLENGE 5