Node JS Interview Questions and Answers
Top Node.js Interview Questions and Answers for Developers
Node JS Interview Questions and Answers
Node.js interview questions and answers are important for candidates seeking roles in the field of web development, especially in environments that utilize the Node.js runtime. These questions assess candidates' knowledge of Node.js principles, including its event-driven, non-blocking architecture, as well as their proficiency in handling asynchronous operations, building efficient APIs, and managing data using Node.js modules and technologies. A strong understanding of these concepts and their practical application showcases a candidate's ability to develop robust and scalable web applications using Node.js, making them valuable assets to development teams.
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1 - What is Node.js?
Node.js is a JavaScript runtime environment that allows developers to build server side and networking applications. It is based on Google's V8 JavaScript engine and is designed for building fast, scalable, and data intensive applications.
2) What are the advantages of using Node.js?
Node.js offers several advantages, including:
Asynchronous and event driven, allowing for highly concurrent and scalable applications.
Cross platform compatibility, enabling deployment on various operating systems.
Extensive ecosystem of libraries and modules for various functionalities.
Support for real time applications and websockets.
3) What is the event loop in Node.js?
The event loop is a core component of Node.js that handles asynchronous operations. It continually checks for events and callbacks, executes them in the order they were registered, and pushes the results to the callback queue.
4) What is the difference between blocking and non blocking I/O in Node.js?
Blocking I/O operations wait for the completion of an operation before continuing execution, while non blocking I/O operations allow other operations to execute while waiting for I/O completion.
5) What is the difference between a module and a package in Node.js?
A module represents a single, reusable unit of code within a Node.js application, while a package is a collection of related modules that are usually distributed together.
6) What is NPM?
NPM (Node Package Manager) is the default package manager for Node.js and serves as a repository for JavaScript modules. It allows developers to install, publish, and manage packages easily.
7) What is a middleware in Node.js?
A middleware is a function that has access to the request and response objects in an HTTP cycle. It allows developers to perform operations on the request and response, such as authentication, logging, or data processing, before the request reaches the intended route.
8) What is the purpose of the express.js framework?
Express.js is a popular Node.js framework for building web applications and APIs. It provides a set of middleware functions and tools that simplify the development process, enabling developers to quickly create and manage HTTP requests and responses.
9) What are the different types of HTTP request methods?
Common HTTP request methods include GET, POST, PUT, PATCH, DELETE, and OPTIONS. Each method serves a specific purpose, such as retrieving resources, creating new ones, or updating existing data.
10) What is CORS?
CORS (Cross Origin Resource Sharing) is a mechanism that allows web applications to make requests to resources on different origins. It addresses security concerns by implementing specific HTTP headers that control which origins can access the resources.
11 - What is the purpose of a database in Node.js?
Databases are used in Node.js to store and manage data. They allow developers to persist data, perform queries, and retrieve information as needed. Popular database options include MySQL, MongoDB, and PostgreSQL.
12) What is the difference between a relational and a non relational database?
Relational databases follow a structured approach, with data organized into tables and rows, while non relational databases (NoSQL) use more flexible data models, such as key value stores, document databases, or graph databases.
13) What is a REST API?
REST (Representational State Transfer) is an architectural style for building web services. It defines a set of guidelines for creating and consuming web resources using HTTP requests and responses, enabling interoperability between different systems and applications.
14) What is the purpose of JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format used to represent data structures as a string. It is commonly used for sending and receiving data between applications or for storing data in files.
15) What is a callback function?
A callback function is a function that is passed as an argument to another function. It is invoked when the outer function completes its task, allowing the caller to continue execution without waiting for the completion of the outer function's operation.
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Functional Tools
1 - Node.js: A JavaScript runtime environment used to develop server side and command line applications.
2) Express.js: A web application framework for Node.js that provides routing, templating, and middleware support.
3) MongoDB: A NoSQL document oriented database that stores data in JSON like documents and provides flexible querying capabilities.
4) Mongoose: An object document mapper for MongoDB that simplifies working with MongoDB data in Node.js by providing a schema based approach.
5) Socket.IO: A library that enables real time, bidirectional communication between web clients and servers using WebSocket and long polling.
6) ESLint: A linting tool for JavaScript that helps identify and fix potential errors and formatting issues in code.
7) Jest: A testing framework for JavaScript that provides assertion and mocking capabilities for writing unit and integration tests.
8) Postman: A platform for testing and managing APIs that allows users to send requests, inspect responses, and create collections of requests for automated testing.
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