Node.js Interview Questions

Yes. Node is a single-threaded application with event looping.

Yes. You can evaluate simple expressions using Node REPL.

These are the following purposes of Node.js: Real-time web applications Network applications Distributed systems General purpose applications

In REPL, the underscore variable is used to get the last result.

Following are the main advantages of Node.js: Node.js is asynchronous and event-driven. All API?s of Node.js library are non-blocking, and its server doesn’t wait for an API to return data. It moves to the next API after calling it, and a notification mechanism of Events of Node.js responds to the server from the previous API …

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Yes, Node.js Crypto module supports cryptography. It provides cryptographic functionality that includes a set of wrappers for open SSL’s hash HMAC, cipher, decipher, sign and verify functions.

A web application distinguishes into 4 layers: Client Layer: The Client layer contains web browsers, mobile browsers or applications which can make an HTTP request to the web server. Server Layer: The Server layer contains the Web server which can intercept the request made by clients and pass them the response. Business Layer: The business …

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npm stands for Node Package Manager. Following are the two main functionalities of npm: Online repositories for node.js packages/modules which are searchable on search.nodejs.org Command line utility to install packages, do version management and dependency management of Node.js packages.

I/O stands for input and output. It accesses anything outside of your application. It loaded into the machine memory to run the program, once the application starts.

Following is a list of tools that can be used in developing code in teams, to enforce a given style guide and to catch common errors using static analysis. JSLint JSHint ESLint JSCS