Defining models in Express - Mini Project: Build & Apply

Defining Models in Express

📋 What You'll Learn

💡 Why This Matters

🌍 Real World

Models help organize and validate data in web apps like Express, making code easier to manage and reuse.

💼 Career

Understanding how to define and export models is essential for backend developers working with Node.js and Express.

1

Create the book model object

Create a JavaScript object called book with these exact properties and values: title set to "The Great Gatsby", author set to "F. Scott Fitzgerald", and year set to 1925.

Express

// Your code here

Need a hint?

Use const book = {} and add the properties inside the curly braces.

2

Add a minimum year variable

Add a variable called minYear and set it to 1900.

Express

const book = {
  title: "The Great Gatsby",
  author: "F. Scott Fitzgerald",
  year: 1925
};

// Your code here

Need a hint?

Use const minYear = 1900; to create the variable.

3

Create a validation function

Create a function called isValidBook that takes a parameter book and returns true if book.year is greater than or equal to minYear, otherwise returns false.

Express

const book = {
  title: "The Great Gatsby",
  author: "F. Scott Fitzgerald",
  year: 1925
};

const minYear = 1900;

// Your code here

Need a hint?

Define the function with function isValidBook(book) {} and use a return statement to compare book.year with minYear.

4

Export the model and function

Export the book object and isValidBook function using module.exports as an object with keys book and isValidBook.

Express

const book = {
  title: "The Great Gatsby",
  author: "F. Scott Fitzgerald",
  year: 1925
};

const minYear = 1900;

function isValidBook(book) {
  return book.year >= minYear;
}

// Your code here

Need a hint?

Use module.exports = { book, isValidBook }; to export both.