Request and response schemas in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express library.

Express

const express = require('[1]');

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

Afs

Bhttp

Cpath

Dexpress

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' instead of 'express' for the import.

Forgetting to put quotes around the package name.

The Express library is imported using require('express').

2fill in blank

medium

Complete the code to define a POST route that expects JSON data.

Express

app.post('/data', (req, res) => {
  const userData = req.[1];
  res.send('Received');
});

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

Aquery

Bparams

Cbody

Dheaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using req.params or req.query to get JSON data.

Not using middleware to parse JSON before accessing req.body.

The JSON data sent in a POST request is accessed via req.body.

3fill in blank

hard

Fix the error in the response to send JSON data correctly.

Express

res.[1]({ message: 'Success' });

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

Ajson

Bend

Cwrite

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.send() without setting headers explicitly.

Using res.write() or res.end() which are lower-level methods.

Use res.json() to send a JSON response with the correct headers.

4fill in blank

hard

Fill both blanks to validate request data and send an error response if invalid.

Express

if (!req.body.name || typeof req.body.name !== '[1]') {
  return res.status([2]).json({ error: 'Name is required and must be a string' });
}

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

Astring

Bnumber

C400

D404

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong data type in typeof check.

Using 404 status code which means not found.

The code checks if name is a string and sends a 400 Bad Request status if not.

5fill in blank

hard

Fill all three blanks to create a response schema that sends user info with id, name, and active status.

Express

res.json({
  id: req.body.[1],
  name: req.body.[2],
  active: req.body.[3]
});

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

AuserId

Bname

Cactive

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong property names that don't exist in req.body.

Including unrelated fields like email when not required.

The response sends userId, name, and active fields from the request body.