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Database Integration in Node.js Quiz – 15 Questions with Answers

Test your knowledge of database integration in Node.js with 15 questions covering database drivers, MongoDB, SQL databases, connection handling, queries, asynchronous operations, and environment variables.

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12 min
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  1. 1. Why is a database commonly integrated with a Node.js application?

    • A. To store and retrieve persistent application data
    • B. To replace JavaScript
    • C. To compile Node.js code
    • D. To create HTML automatically
    Show answer

    A. To store and retrieve persistent application data

    A database provides persistent storage so a Node.js application can save, retrieve, update, and delete data.

  2. 2. Which of the following is a popular NoSQL database that can be integrated with Node.js?

    • A. MongoDB
    • B. MySQL
    • C. PostgreSQL
    • D. SQLite
    Show answer

    A. MongoDB

    MongoDB is a popular NoSQL document database commonly used with Node.js applications.

  3. 3. Which package is commonly used to connect a Node.js application directly to MongoDB?

    • A. mongodb
    • B. mongo-node-only
    • C. node-mongo-connect
    • D. mongodb-driver-js-only
    Show answer

    A. mongodb

    The official mongodb npm package provides the MongoDB Node.js driver for connecting to and interacting with MongoDB databases.

  4. 4. Which of the following is a relational database commonly used with Node.js?

    • A. MongoDB
    • B. MySQL
    • C. Redis
    • D. CouchDB
    Show answer

    B. MySQL

    MySQL is a relational database management system that can be accessed from Node.js using appropriate drivers or database libraries.

  5. 5. Which Node.js module is commonly used to connect to SQLite databases?

    • A. sqlite3
    • B. node-sql-only
    • C. sqlite-node-core
    • D. database-sqlite-native-only
    Show answer

    A. sqlite3

    The sqlite3 package provides a Node.js interface for working with SQLite databases.

  6. 6. Why are environment variables commonly used for database configuration?

    • A. To store database credentials and configuration outside source code
    • B. To make SQL queries faster
    • C. To convert SQL into JavaScript
    • D. To automatically create database tables
    Show answer

    A. To store database credentials and configuration outside source code

    Environment variables can keep sensitive information such as database URLs, usernames, and passwords separate from application source code.

  7. 7. What is a database connection pool?

    • A. A collection of reusable database connections
    • B. A database backup file
    • C. A table containing database users
    • D. A JavaScript array containing SQL queries
    Show answer

    A. A collection of reusable database connections

    A connection pool maintains multiple database connections that can be reused by application requests, reducing the overhead of repeatedly creating connections.

  8. 8. Which JavaScript feature is commonly used when working with asynchronous database operations in Node.js?

    • A. async/await
    • B. goto
    • C. typedef
    • D. include
    Show answer

    A. async/await

    Database operations are often asynchronous in Node.js, and async/await provides a convenient way to write and manage asynchronous code.

  9. 9. What is the main purpose of a database driver in a Node.js application?

    • A. To provide an interface between Node.js and a database
    • B. To compile JavaScript into machine code
    • C. To create HTTP servers automatically
    • D. To replace the operating system
    Show answer

    A. To provide an interface between Node.js and a database

    A database driver allows a Node.js application to connect to a specific database system and execute database operations.

  10. 10. What is the purpose of parameterized queries in SQL-based Node.js applications?

    • A. To help prevent SQL injection
    • B. To make every query return all rows
    • C. To remove database indexes
    • D. To automatically create tables
    Show answer

    A. To help prevent SQL injection

    Parameterized queries separate SQL commands from user-supplied values, helping prevent SQL injection attacks.

  11. 11. Which SQL operation is used to retrieve data from a table?

    • A. INSERT
    • B. UPDATE
    • C. SELECT
    • D. DELETE
    Show answer

    C. SELECT

    The SQL SELECT statement is used to retrieve data from one or more database tables.

  12. 12. Which SQL operation is used to add a new record to a table?

    • A. INSERT
    • B. FETCH
    • C. CREATE ROW
    • D. ADD RECORD
    Show answer

    A. INSERT

    The SQL INSERT statement is used to add new records to a table.

  13. 13. What should a Node.js application generally do when a database operation fails?

    • A. Ignore the error
    • B. Handle the error appropriately and provide a suitable response
    • C. Restart the operating system
    • D. Delete the database
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    B. Handle the error appropriately and provide a suitable response

    Database errors should be handled so the application can log useful information, maintain stability, and return an appropriate response to the client.

  14. 14. What is an ORM in the context of database integration?

    • A. Object-Relational Mapping
    • B. Object Request Module
    • C. Operational Runtime Manager
    • D. Online Resource Model
    Show answer

    A. Object-Relational Mapping

    ORM stands for Object-Relational Mapping. An ORM allows developers to work with relational database data using application-level objects and abstractions.

  15. 15. Which practice is generally recommended when integrating a database with a Node.js application?

    • A. Hard-code database passwords directly in source code
    • B. Create a new database connection for every operation without considering pooling
    • C. Use secure configuration, connection management, parameterized queries, and proper error handling
    • D. Allow every user to execute arbitrary SQL queries
    Show answer

    C. Use secure configuration, connection management, parameterized queries, and proper error handling

    Secure configuration, efficient connection management, parameterized queries, and proper error handling are important practices for reliable and secure database integration.