Request validation in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express library.

Node.js

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

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

Afs

Bhttp

Cexpress

Dpath

Attempts:

3 left

💡 Hint

Common Mistakes

Using built-in modules like 'http' instead of 'express'.

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

2fill in blank

medium

Complete the code to create a new Express application instance.

Node.js

const app = [1]();

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

Aexpress

Bhttp

Crouter

Dserver

Attempts:

3 left

💡 Hint

Common Mistakes

Calling a non-existent function like 'http()'.

You create an Express app by calling express().

3fill in blank

hard

Fix the error in the middleware function to correctly parse JSON requests.

Node.js

app.use(express.[1]());

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

Ajson

Burlencoded

Cstatic

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'urlencoded' when expecting JSON data.

To parse JSON request bodies, use express.json() middleware.

4fill in blank

hard

Fill both blanks to validate that the request body has a 'name' property before proceeding.

Node.js

app.post('/submit', (req, res, next) => {
  if (!req.body.[1]) {
    return res.status([2]).send('Name is required');
  }
  next();
});

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

Aname

B400

C404

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for 'username' instead of 'name'.

Using 404 instead of 400 status code.

The code checks if req.body.name exists. If not, it sends a 400 Bad Request status.

5fill in blank

hard

Fill all three blanks to create a middleware that validates 'email' and 'password' fields in the request body.

Node.js

function validateUser(req, res, next) {
  const { [1], [2] } = req.body;
  if (![1] || ![2]) {
    return res.status(400).send('Email and password are required');
  }
  next();
}

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

Aemail

Bpassword

Cusername

Dtoken

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'username' or 'token' instead of 'email' and 'password'.

The middleware extracts email and password from req.body and checks if both exist before continuing.