Why API documentation matters in Express - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic Express server.

Express

const express = require('express');
const app = express();
app.get('/', (req, res) => {
  res.send('Hello World!');
});
app.listen([1], () => console.log('Server running'));

Drag options to blanks, or click blank then click option'

Aexpress

B'3000'

Capp

D3000

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a number for the port.

Passing the app or express object instead of a port number.

The listen method requires a port number as a number, not a string or other value.

2fill in blank

medium

Complete the code to parse JSON request bodies in Express.

Express

const express = require('express');
const app = express();
app.use([1]());

Drag options to blanks, or click blank then click option'

AbodyParser.json

BjsonParser

Cexpress.json

Dexpress.body

Attempts:

3 left

💡 Hint

Common Mistakes

Using bodyParser.json without importing body-parser.

Using incorrect middleware names.

Express has a built-in json middleware accessed by express.json().

3fill in blank

hard

Fix the error in the route handler to send a JSON response.

Express

app.get('/data', (req, res) => {
  res.[1]({ message: 'Hello API' });
});

Drag options to blanks, or click blank then click option'

AsendText

Bjson

CsendFile

DsendHtml

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.sendText or res.sendHtml which are not valid Express methods.

Using res.sendFile for JSON data.

To send JSON data, use res.json() method.

4fill in blank

hard

Fill both blanks to create a route that accepts POST requests and reads JSON data.

Express

app.[1]('/submit', (req, res) => {
  const data = req.[2];
  res.json({ received: data });
});

Drag options to blanks, or click blank then click option'

Apost

Bbody

Cget

Dparams

Attempts:

3 left

💡 Hint

Common Mistakes

Using app.get instead of app.post for POST routes.

Accessing req.params instead of req.body for JSON data.

POST routes use app.post and JSON data is in req.body.

5fill in blank

hard

Fill all three blanks to create a simple Express API with a GET route that returns a JSON message.

Express

const express = require('express');
const app = express();
app.[1]('/hello', (req, res) => {
  res.[2]({ message: 'Hi there!' });
});
app.listen([3], () => console.log('API running'));

Drag options to blanks, or click blank then click option'

Aget

Bjson

C3000

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Using app.post for a GET route.

Using res.send instead of res.json for JSON response.

Passing a string instead of a number for the port.

GET route uses app.get, sends JSON with res.json, and listens on port 3000.