Here are some Node.js fresher interview questions with answers:
What is Node.js?
Node.js is an open-source, cross-platform runtime environment that runs JavaScript code outside of a browser. Node.js uses an event-driven, non-blocking I/O model that makes it ideal for building scalable network applications.
What are the benefits of using Node.js?
There are many benefits to using Node.js, including:
* **Performance:** Node.js is very fast and efficient, thanks to its event-driven, non-blocking I/O model.
* **Scalability:** Node.js is very scalable, and can be used to build large, complex applications.
* **Community:** Node.js has a large and active community, which means there are many resources available to help developers learn and use Node.js.
What are the limitations of using Node.js?
There are a few limitations to using Node.js, including:
* **Single-threaded:** Node.js is a single-threaded runtime environment, which means that only one task can be executed at a time. This can be a limitation for applications that require a lot of CPU power.
* **Memory management:** Node.js uses a garbage collector to manage memory, which can lead to memory leaks if the application is not properly designed.
* **Security:** Node.js is a relatively new platform, and there are still some security vulnerabilities that have not been fixed.
What are the different types of Node.js applications?
There are many different types of Node.js applications, including:
* **Web applications:** Node.js is a popular choice for building web applications, thanks to its performance and scalability.
* **Real-time applications:** Node.js is well-suited for building real-time applications, such as chat applications and video streaming applications.
* **Backend applications:** Node.js can be used to build backend applications, such as APIs and microservices.
What are some of the most popular Node.js frameworks?
Some of the most popular Node.js frameworks include:
* Express: Express is a popular framework for building web applications.
* NestJS: NestJS is a framework for building scalable, enterprise-grade applications.
* Sails.js: Sails.js is a framework for building real-time applications.
What are some of the most popular Node.js modules?
Some of the most popular Node.js modules include:
* `npm`: `npm` is the official package manager for Node.js.
* `express`: `express` is a popular framework for building web applications.
* `mysql`: `mysql` is a module for connecting to MySQL databases.
* `mongodb`: `mongodb` is a module for connecting to MongoDB databases.
* `redis`: `redis` is a module for connecting to Redis databases.
What are some tips for writing efficient Node.js code?
Here are a few tips for writing efficient Node.js code:
* Use the event-driven, non-blocking I/O model.
* Use asynchronous functions.
* Use modules.
* Use the `async` and `await` keywords.
* Use the `Promise` constructor.
These are just a few of the Node.js fresher interview questions that you may be asked. By preparing for these questions, you can increase your chances of success in your next Node.js interview.
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