If you’re planning a career change and have a job interview coming up, it’s always a good idea to be prepared and brush up on your interviewing skills beforehand. Although there are a few Node.js interview questions that are asked in all sorts of interviews, we also urge you to concentrate on questions that are special to your particular firm as you prepare.
We have compiled a comprehensive list of frequently asked Node.js interview questions along with the best answers for each. This will also help you understand the fundamental concepts of Node.js.
What Advantages Come with Utilizing Node.js?
- The event-driven, asynchronous, or non-blocking APIs of the Node.js library are all present. It means that a Node.js server never has to wait for an API to return data. The server moves on to the next API after visiting one, while Node.js’ Events notification system enables the server to receive feedback from a prior API request.
- The Node.js library executes code very quickly because of its foundation in the V8 JavaScript Engine of Google Chrome. But if you do not succeed, you can hire professional developers: here.
- Node.js uses an event looping single-threaded architecture and is extremely scalable. In contrast to conventional servers, which generate a set number of threads to handle requests, event methods allow servers to respond without bloating and boost server scalability. Node.js uses a single-threaded program, and this program is far more capable of handling a large number of requests than a traditional server, such as the Apache HTTP Server.
- Applications written in Node.js never keep data in a buffer. Only parts of the data are produced by these applications.
Popular Frameworks for Node.js
In contrast to other server-side frameworks or technologies like Ruby on Rails, Java, PHP, and.net, Node.js leverages asynchronous I/O and single-thread event-driven programming. JavaScript programming abilities may be used by developers to create server-side apps.
Applications that collect real-time user statistics and analyze market patterns for commodities, currencies, stocks, futures, options, etc. may all benefit from the performance and scalability enhancements provided by Node.js. JavaScript-savvy programmers may easily and rapidly create node.js APIs for mobile or web integration.
What Are the Differences between Synchronous and Asynchronous Functions?
I/O activities are the principal applications for synchronous functions. They respond immediately to changes in the server’s data flow and maintain the required pace of data flow. The API will throw an exception if there are no answers.
Asynchronous functions, on the other hand, operate on the principle of not being synchronous, as the name indicates. When pushed in this case, HTTP requests won’t wait for a response to start processing. Even though the server has already received the response, earlier requests will still get continuous responses.
How Does Node.js’ Event Loop Function? What Is It?
All asynchronous callbacks in an application are managed by an event loop in Node.js. It is one of Node.js’s most crucial features and the reason why Node.js has non-blocking I/O. Node.js is an event-driven language, therefore it’s simple to connect a listener to an event, which will cause that listener to run the callback when the event happens.
When calling functions like setTimeout, HTTP.get, and fs.readFile, Node.js first executes the event loop and then continues running the code without awaiting the result. Node.js gets the output when the process is complete, and the callback function is then carried out.
Describe the Web Application Architecture in Node.js
An online application is divided into four layers:
- Client Layer. Web browsers, mobile browsers, and programs that can send an HTTP request to a web server are all included in the client layer.
- Server Layer. The Web server, which may intercept client requests and transmit them the response, is part of the server layer.
- Commercial Layer. The web server uses the application server found in the business layer to do the necessary processing. Through a database or certain third-party programs, this layer communicates with the data layer.
A layer of data. Databases and other data sources are included in the data layer.
Conclusion
The most often used platform for creating backend web services that use RESTful API to connect to server-side databases is a runtime JavaScript environment like Node.js.
The development of scalable data-intensive networks and e-commerce systems that are event-driven and asynchronous is another area where Node.js is put to use.
