Why database integration matters in Express - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express module.

Express

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

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

Ahttp

Bfs

Cpath

Dexpress

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' instead of 'express' to import the framework.

Forgetting to put the module name in quotes.

The Express module is imported using require('express'). This allows us to create an Express app.

2fill in blank

medium

Complete the code to connect to a MongoDB database using Mongoose.

Express

const mongoose = require('mongoose');
mongoose.connect('[1]');

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

A'http://localhost:3000'

B'mongodb://localhost:27017/mydb'

C'express://localhost:27017'

D'file://mydb'

Attempts:

3 left

💡 Hint

Common Mistakes

Using HTTP URLs instead of MongoDB connection strings.

Missing quotes around the connection string.

To connect to MongoDB with Mongoose, use the MongoDB connection string starting with mongodb://.

3fill in blank

hard

Fix the error in the Express route that saves data to the database.

Express

app.post('/add', async (req, res) => {
  const item = new Item({ name: req.body.[1] });
  await item.save();
  res.send('Saved');
});

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

Adata

Btitle

Cname

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a field name that does not exist in the model.

Forgetting to parse JSON body before accessing it.

The model expects a field called name. Using req.body.name correctly accesses the data sent by the client.

4fill in blank

hard

Fill both blanks to create a Mongoose schema and model for a user.

Express

const userSchema = new mongoose.Schema({
  [1]: String,
  [2]: Number
});
const User = mongoose.model('User', userSchema);

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

Ausername

Bemail

Cage

Dpassword

Attempts:

3 left

💡 Hint

Common Mistakes

Using email as a number type.

Confusing password with age.

The schema defines a username as a string and age as a number, which are common user fields.

5fill in blank

hard

Fill all three blanks to query users older than 18 and sort by username.

Express

User.find({ [1]: { [2]: 18 } })
  .sort({ [3]: 1 })
  .exec((err, users) => {
    if (err) return console.error(err);
    console.log(users);
  });

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

Aage

B$gt

Cusername

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$lt' instead of '$gt' for greater than.

Sorting by email instead of username.

This query finds users where age is greater than ($gt) 18, then sorts them by username in ascending order.