Node.js API Tutorial: Build Your First REST API Quiz

Discover the essentials of building a professional REST API in Node.js using Express.js, covering core features, patterns, and beginner-friendly steps. This quiz highlights key concepts and practical steps required to develop a backend API from scratch.

1. Node.js Benefits for Backend APIs

   Which feature of Node.js allows it to efficiently handle many simultaneous connections when creating a backend API?

   1. Synchronous execution
   2. Non-blocking I/O
   3. Single-threaded loops
   4. Strict typing

   Explanation: Non-blocking I/O enables Node.js to manage thousands of concurrent requests without waiting for one to finish before handling another. Strict typing is unrelated to Node.js's concurrency; in fact, JavaScript is loosely typed. Single-threaded loops do not offer concurrency, and synchronous execution would block requests rather than handle them simultaneously.

2. Preferred Framework for Node.js APIs

   Which NPM library is commonly used with Node.js to simplify building REST APIs through routing and middleware features?

   1. Express.js
   2. React
   3. Mongoose
   4. Mocha

   Explanation: Express.js is a web framework that makes routing and middleware management straightforward in Node.js for API development. React is a frontend library, not for backend APIs. Mocha is a testing tool, and Mongoose is an ODM for MongoDB, not an API framework.

3. CRUD Operations in a Book API

   In a RESTful Book API, which HTTP verb is commonly used to retrieve the details of a single book resource?

   1. POST
   2. GET
   3. PUT
   4. DELETE

   Explanation: GET requests retrieve data, such as details of a single book. POST is used to create new resources, PUT is typically for updating, and DELETE is for removing resources.

4. Role of the Package.json File

   What is the primary purpose of the package.json file in a Node.js project?

   1. To handle database connections
   2. To store source code files
   3. To manage dependencies and meta-information for the project
   4. To generate HTML templates

   Explanation: The package.json file lists dependencies, scripts, and project details, making application setup and sharing easy. It does not store source code, manage databases, or generate HTML templates.

5. Testing API Endpoints

   Which tool is often used by developers to send HTTP requests and test REST API endpoints during Node.js development?

   1. Webpack
   2. Git
   3. Postman
   4. Nodemon

   Explanation: Postman is a tool for manually sending HTTP requests, making it ideal for testing API endpoints. Webpack bundles frontend assets, Nodemon auto-restarts servers, and Git handles version control but none are primarily for testing APIs.