Interview Questions Nodejs
Understanding Your Nodejs Knowledge: Interview Questions
Node.js is a runtime environment for executing JavaScript code outside of a web browser. This is typically used for creating server-side applications and web APIs. Interview questions for Node.js may cover topics such as its event-driven, non-blocking architecture, its use of the V8 JavaScript engine, and its ability to handle a large number of concurrent connections. Candidates may also be asked about specific Node.js modules, debugging techniques, and its role in the MEAN stack.
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1 - What is Nodejs?
Nodejs is a server side JavaScript runtime environment that allows developers to run JavaScript code outside of a web browser. It uses an event driven, asynchronous architecture, making it lightweight and efficient for building scalable web applications.
2) How does Nodejs handle concurrency?
Nodejs employs a single threaded, event loop architecture that allows it to handle multiple incoming requests without getting blocked. It uses non blocking I/O operations, allowing it to handle concurrent requests in a more efficient manner.
3) What is npm?
npm stands for Node Package Manager and is the default package manager for Nodejs. It allows developers to easily install, manage and share reusable packages of code, making it easier to build complex applications.
4) How can you handle errors in Nodejs?
Nodejs provides a comprehensive error handling mechanism through the use of try catch blocks. It also has built in error objects and methods that can be used to handle and report errors in a more structured way.
5) Can you explain the difference between callback functions and promises in Nodejs?
Callback functions are used to handle asynchronous operations in Nodejs by passing a function as an argument to another function. Promises, on the other hand, are an alternative approach that allows for more structured and readable code when handling asynchronous operations.
6) What is the purpose of the “require” keyword in Nodejs?
The “require” keyword is used to import modules in Nodejs. It allows developers to reuse code and avoid writing the same functionality multiple times.
7) How does Nodejs handle file operations?
Nodejs uses a built in “fs” module that provides methods for reading, writing, and modifying files. These methods can be performed synchronously or asynchronously, depending on the needs of the application.
8) Is it possible to use databases in Nodejs?
Yes, Nodejs has a robust ecosystem of open source libraries and packages that allow developers to easily connect to and use various databases, including MySQL, MongoDB, and PostgreSQL.
9) How can you create a server in Nodejs?
Nodejs provides a built in “http” module that can be used to create a server and handle incoming requests. Developers can also use popular frameworks like Express or Koa to create servers and handle routing in a more efficient way.
10) What is middleware in the context of Nodejs?
Middleware refers to functions that are placed in between the request and response cycle of a Nodejs application. It can be used to perform tasks such as authentication, error handling, and logging.
11) How can you handle routing in Nodejs?
Nodejs has built in functionality for handling routing through the use of the “http” module. Developers can also use popular frameworks like Express or Koa to handle routing and create a more structured and organized codebase.
12) What is the significance of the package.json file in Nodejs?
The package.json file is a manifest file that contains information about the Nodejs application, such as dependencies, scripts, and metadata. It allows for easy management of the application's dependencies and the ability to run custom scripts.
13) Can you explain the concept of streams in Nodejs?
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Streams are a way of handling data in chunks in Nodejs. They allow for efficient reading and writing of data without having to load the entire file into memory, making it useful for large files or real time data.
14) How can you handle caching in Nodejs?
Nodejs provides built in caching mechanisms through the use of the “Node Cache” and “Memory cache” packages. Developers can also use third party caching services like Redis for more robust and scalable caching.
15) What is cluster module in Nodejs?
The cluster module in Nodejs allows developers to create child processes that can share server ports. This allows for better utilization of CPU cores, improving the performance and scalability of Nodejs applications.
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