JavaScript - ARDSOFT IT SERVICES

MERN Stack- Node-Express-Mongodb

This test include question of Node Express and MongoDB

NameEmail

How can you create a route in Express.js to handle a DELETE request to the /delete-user/:userId endpoint and delete the user with the specified ID?

app.delete('/delete/:id', (req, res) => { const id = req.params.id; // Delete the resource with the specified id });

app.delete('/:userId', (req, res) => { const userId = req.params.userId; // Delete the user with the specified userId });

app.delete('/delete-user/:userId', (req, res) => { const userId = req.params.userId; // Delete the user with the specified userId });

app.route('/delete-user/:id') .delete((req, res) => { const id = req.params.id; // Delete the user with the specified id });

How do you define a route in Express.js?

app.set('/route', function(req, res) { // route handling logic });

app.get('/route', function(req, res) { // route handling logic });

app.use('/route', function(req, res) { // route handling logic });

app.route('/route').get(function(req, res) { // route handling logic });

Which HTTP method is used to retrieve data?

DELETE

POST

GET

PUT

What will be the output of the following code snippet?

const obj1 = {first: 20, second: 30, first: 50};

{first: 50, second: 30}

{first: 20, second: 30}

{first: 20, second: 30; first: 50}

Syntax Error

What will be the output of the following code snippet?
print(typeof(NaN));

None of the above

Object

Number

String

What is the purpose of the next() function in Express.js middleware?

To pass control to the next middleware function

To send a response to the client

To end the request-response cycle

To skip the current middleware function

What is the main purpose of package.json in a Node.js project?

Store database schema

Manage project dependencies and metadata

Run server automatically

Store application code

Which function in Express is used to start the server?

app.start()

app.run()

app.server()

app.listen()

In Express.js, which object is used to send a response to the client?

response

res

send

request

Which package is commonly used to connect MongoDB with Node.js?

mongo-node

mongoose

mongodb-connect

dbconnect

Which method updates a document in MongoDB?

modifyOne()

updateOne()

setOne()

edit()

Which command installs MongoDB driver for Node.js?

npm install mongoose-db

node install mongodb

npm install mongo

npm install mongodb

Which function delays execution for specified milliseconds?

setTimeout()

delay()

wait()

pause()

Which method removes the last element from an array?

delete()

pop()

shift()

remove()

Which command shows all collections in a MongoDB database?

show collections

db.collections()

list collections

show tables

How can you access query parameters in a URL using Express.js?

req.urlParams

req.queryParams

req.query

req.params

Which statement creates a Promise?

Promise.create()

new Async()

create Promise()

new Promise()

Which method converts an object into JSON string?

toJSON()

convertJSON()

JSON.stringify()

JSON.parse()

Which method is used to insert a document in MongoDB?

addOne()

create()

push()

insertOne()

Which module is used to create a router in Express?

router.create()

express.createRouter()

express.route()

express.Router()

Which command creates a package.json file?

node init

npm init

npm start

npm create

Which keyword is used to handle errors?

error

try…catch

catchError

handle

What is the purpose of the app.use() method in Express.js?

To set a custom port

To render a view

To define a route

To use a middleware function

MongoDB stores data in which format?

Rows

Documents

Arrays

Tables

What will be the output of the following code snippet when a request is made to the /calculate endpoint with the query parameters num1=5 and num2=10?

app.get('/calculate', (req, res) => {
  const num1 = parseInt(req.query.num1);
  const num2 = parseInt(req.query.num2);
  const sum = num1 + num2;
  res.send({ sum: sum });
});

{ sum: '510' }

{ sum: NaN }

Error: num1 or num2 is not a number

{ sum: 15 }

How can you access form data in a POST request using Express.js?

req.query

req.params

req.headers

req.body

How can you set a custom port for your Express.js application?

app.set('port', 3000);

app.use(3000);

app.listen(3000);

app.port = 3000;

Which HTTP status indicates successful creation?

201

200

404

204

Which status code means “Not Found”?

500

200

301

404

In MongoDB, which command deletes an entire collection?

deleteCollection()

clear()

removeCollection()

drop()

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