Node js Interview Questions and Answers

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Many programmers are focused on learning Node.js. Yet, if one were to sit across from you in an interview and you had to ask a few questions, can you determine how skilled they are in the technicalities of Node.js?

General Node.js interview questions.

Work Experience.
Questions in this regard are an opportunity to understand the applicant’s technical experience programming with Node.js specifically. This stage should prepare you for the kind of Node.js technical interview questions that you would use as a follow-up. By then, you can tell if a person is less experienced than they claim to be.

Industry Experience.
Software development is not just about writing code; a backend developer also needs to gain some industry-specific knowledge that informs their Node.js programming inquiries and decisions and must demonstrate such when examined. Therefore, you want to examine Node.js backend developers to determine their preparation to navigate the terrain of your industry.

Basic Node.js interview questions and answers for beginners.

What is Node.js & how does it work?
Node.js is an open-source Javascript runtime based on Google Chrome’s Javascript V8 engine. It is neither a programming language nor a server-side framework. Javascript is the language and Node.js itself features frameworks such as Express and Adonis. Node.js is Javascript too and it extends the language’s traditional functions beyond the web browser to being able to develop network applications independently and at scale.

What benefits does Node.js have compared with other back-end technologies?
It uses an asynchronous non-blocking model that enables smooth multitasking. It is easily scalable and very flexible and it also significantly enhances performance, particularly for applications that run real-time operations (chat, online gaming, video conferencing, etc.) Front-end developers are usually already familiar with Javascript, hence the transition to back-end development through Node is almost entirely hassle-free.

What is a package.json file in Node.js?
Package.json is essentially the manifest of a program. The file, found in the project root, includes all the various metadata associated with the project including applications, modules, libraries, packages, etc. Being the core of the project, the package.json file makes the program reproducible. The only two fields required of the package.json file are the name and the package deals.

Mid-Level Node.js Interview Questions and Answers for Intermediate Coders.

What are the promises?
Promises represent objects with an indeterminate value of future successful execution or failure. It is like a ‘proxy for a value that will eventually become available.’ Promises help developers to deal with the asynchronous code model and avoid falling into callback hell. The state of a promise event can be pending, fulfilled, or rejected.

What are the commonly used frameworks in Node.js today?
Express: Express is favored for its minimalist approach as well as its flexibility. Prominent Express features include basic routing, model-view-controller (MVC), middlewares, etc.
Nest: Nest is an enterprise-grade framework that is built for easy scalability.
Hapi: this is a commercially-focused framework that is used by big websites such as PayPal and Disney.

Advanced Node.js Interview Questions and Answers.

What are the streams?
Streams are like pipes that read data from a source and transmit the same to a destination sequentially. Streams are what enable Node.js to work with streaming data on apps such as Netflix. Typically, programs read files into memory non-sequentially, waiting until a file is read completely before processing it.

What is REPL in Node.js?
The REPL programming environment enables the interactive execution of commands. The four functions performed by REPL (from which it gets its acronym) are: Read, Evaluate, Print, and Loop. It is also referred to as ‘Node shell’. Basically, “The shell reads JavaScript code the user enters, evaluates the result of interpreting the line of code, prints the result to the user, and loops until the user signals to quit.”

What is tracing?
The tracing module, enabled via the trace_events function, enables you to trace information generated by V8, userspace code, and Node.js core in a central system. This is done by first determining the pattern of node application and monitoring that data functionally and systemically. Tracing helps by giving performance insights that may be useful for identifying errors and dealing with memory problems.

That is how to prepare for a Node.js backend developer interview.

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