Wipro – Node JS Interview Questions
Here is the list of Node JS Interview Questions which are recently asked in Wipro company. These questions are included for both Freshers and Experienced professionals. Our Node JS Training has Answered all the below Questions.
1. What is Node.js?
2. Explain CLI in Node.js?
Command-line interfaces (CLIs) built in Node JS allows to automate repetitive tasks while leveraging the vast Node JS ecosystem and package managers like npm and yarn , these can be easily distributed and consumed across multiple platforms.
3. In which Language Node Js is written ?
4. Who is the author of Node Js ?
The author of Node JS is Ryan Dahi.
6. Explain V8 Engine ?
An eight-cylinder engine, the V8, is common in pickup trucks, SUVs and sportscars because these engines create a lot of horsepower, torque and are better suited to tow or haul. It has between four and six litres of displacement, depending on the size of the eight cylinders within
7. Explain ECMAScript ?
8. What do you mean by Asynchronous API?
Synchronous/asynchronous APIs are application programming interfaces that return data for requests either immediately or at a later time. In the case of asynchronous APIs, the availability of a resource, service or data store may not be immediate.
9. What are the benefits of using Node.js?
- Simple to use.
- Easy to Learn.
- Faster time-to-market.
- Single programming language
10. Is it free to use Node.js?
11. What is REPL in context of Node?
12. What is Package.json?
13. What is Event Loop?
14. What is purpose of Buffer class in Node?
The Buffer class in Node JS is designed to handle raw binary data. Each buffer corresponds to some raw memory allocated outside V8. Buffers act somewhat like arrays of integers, but aren't resizable and have a whole bunch of methods specifically for binary data.
15. What is Piping in Node?
Piping is a method of transferring data from one stream to other with the help of buffers so that the data transfer process can start as soon as it fills up a buffer. This is a module method to pipe between streams forwarding errors and properly cleaning up and provide a callback when the pipeline is complete.
16. How will you read a file using Node?
Filename holds the name of the file to read or the entire path if stored at other location. Encoding holds the encoding of file. Its default value is 'utf8'. callback_functionis a callback functiion that is called after reading of file.
17. How will you write a file using Node?There are three ways to write a file:
- fs.write(fd, buffer, offset, length, position, callback ) need to wait for the callback to ensure that the buffer is written to disk.
- fs.writeFile(filename, data, [encoding], callback)
- fs.createWriteStream(path, [options] )
18. How will you close a file using Node?
Close() method is used to close the given file descriptor thereby clearing the file that is associated with it. This will allow the file descriptor to be reused for other files. Calling fs.close() on a file descriptor while some other operation is being performed on it may lead to undefined behavior.
19. How will you get information about a file using Node?
Node. js | fs. readFile() Method
Filename holds the name of the file to read or the entire path if stored at other location. Encoding holds the encoding of file. Its default value is 'utf8'. Callback function is a callback function that is called after reading of file.
20. How will you delete a file using Node?
To delete a file in Node JS use Node FS unlink (path, callback) for asynchronous file operation and unlinkSync (path) for synchronous file operation.
TOP MNC's NODE JS INTERVIEW QUESTIONS & ANSWERS
Here we listed all Node JS Interview Questions and Answers which are asked in Top MNCs. Periodically we update this page with recently asked Questions, please do visit our page often and be updated in Node JS.
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