Node.js

1. How to enable v8 inspector for debugging and profiling?
   • –inspect
   • –inspect=<PORT NO>
2. NodeJS is advised to be used for?
   • Single Page Applications
   • JSON APIs based Applications
   • Data steaming applications
   • Data Intensive Realtime Applications
   • I/O bound applications
3. NodeJS is not advised to be used for?
   • CPU intensive applications
4. What’s the code to print the name of Operating system?
   • log(“type:” + os.type());
5. What does REST stands for?
   • Representational State Transfer
6. Ways to create a child process in Nodejs?
   • spawn()
   • fork()
   • exec()
   • execFile()
7. How to print current directory in Nodejs?
   • log(‘Current directory’ + process.cwd());
8. Which is package manager for Node?
   • NPM
9. Which framework includes input validation?
   • Koa
10. In Express application you handles the route ‘/user/:name’. How to access the property name?
    • params.name
11. For Linux, which environment variable is needed to set for successful NodeJS installation?
    • Export PATH=$PATH:/usr/local/nodejs/bin
12. Which file extensions supports Node module system?
    • .js
    • .node
    • .json
13. What will be the output of following code in console?

const EventEmitter = require(‘events’);
const myEve = new EventEmitter();
myEve.on(‘try’, () => {});
myEve.on(‘catch’, () => {});
const sym = Symbol(‘type’);
myEve.on(sym, () => {});

console.log(myEve.eventNames());

• Prints: [ ‘try’, ‘catch’, Symbol(type) ]

14. Correct way to import http module?
    • require(‘http’);
15. If we have following construction in Express.js, which paths will match this route?
    get(‘/ak+hm’, function (req, res) {

res.send(‘ak+hm’)

})

• akhm, akkhm, akkkhm, and so on

16. Which of the commands exit from REPL?
    • double ctrl + c
    • ctrl + d
17. Which method is used to check modifications in files?
    • Watch
18. True statements about the fs module of Node?
    • Asynchronous methods of fs module take last parameter as completion function callback
    • Every method in fs module have synchronous as well as asynchronous form.
19. How to convert from Buffer instance to string of base64?
    • toString(“base64”);
20. Which variables can be used in modules?
    • __filename
    • __dirname
21. Which engine built of NodeJs framework/platform?
    • Google Chrome’s JavaScript V8 Engine
22. Which utility modules are available in NodeJS?
    • OS
    • Path
    • Net
    • DNS
    • Domain
23. Which method will print to the console without a trailing new line?
    • stdout.print()
24. Which is most popular NodeJs framework?
    • Express
25. Which of the following is the result of module.id?
    • File name
26. Which method can be used to write a file in Node.js?
    • createWriteStream()
27. Which method of fs module is used to truncate a file?
    • unlink(path, callback)
28. Which are the debug commands to debug node server?
    • node debug <test.js>
    • node debug – p <pid>
    • node debug <URI>
29. Which console commands will update all installed global packages to the latest available versions?
    • npm update –g
30. How to access the environment variable, «ENV_VARIABLE» in Node.js?
    • env.ENV_VARIABLE
31. Which method can be used to read the contents of a directory?
    • readdir()