Validating body fields 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'

Aexpress

Bbody-parser

Chttp

Dfs

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'body-parser' instead of 'express'.

Using 'http' which is a Node.js core module.

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

2fill in blank

medium

Complete the code to parse JSON body data in Express.

Express

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

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

Aurlencoded

Bjson

Ctext

Draw

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'urlencoded' when expecting JSON data.

Forgetting to add the middleware.

To parse JSON body data, use express.json() middleware.

3fill in blank

hard

Fix the error in the route handler to access the 'username' field from the request body.

Express

app.post('/login', (req, res) => {
  const username = req.body[1];
  res.send(`Hello, ${username}`);
});

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

A.params.username

B.query.username

C['username']

D.username

Attempts:

3 left

💡 Hint

Common Mistakes

Using req.params or req.query instead of req.body.

Missing quotes in bracket notation.

To access the 'username' field from the body, use req.body['username'] or req.body.username. Here, the blank expects bracket notation.

4fill in blank

hard

Fill both blanks to validate that the 'email' field exists and is a string.

Express

if (typeof req.body[1] === '[2]') {
  res.send('Valid email');
} else {
  res.status(400).send('Invalid email');
}

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

A['email']

Bemail

Cstring

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Using dot notation without quotes in the first blank.

Checking for 'number' instead of 'string'.

Use req.body['email'] to access the email field and check if its type is 'string'.

5fill in blank

hard

Fill all three blanks to create a middleware that checks if 'password' exists and is at least 6 characters long.

Express

function validatePassword(req, res, next) {
  const pwd = req.body[1];
  if (typeof pwd === '[2]' && pwd.length [3] 6) {
    next();
  } else {
    res.status(400).send('Password too short');
  }
}

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

A['password']

Bpassword

C>=

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using dot notation without quotes for password.

Checking length with '<' instead of '>='.

Checking type as 'number' instead of 'string'.

Access the password with req.body['password'], check if it is a 'string', and verify length is at least 6 using >=.