MERN Stack - Node-Express-MongoDB

MERN Stack- Node-Express-Mongodb

This test include question of Node Express and MongoDB

NameEmail

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

req.params

req.query

req.queryParams

req.urlParams

Which command creates a package.json file?

npm start

node init

npm create

npm init

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

To end the request-response cycle

To skip the current middleware function

To send a response to the client

To pass control to the next middleware function

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: NaN }

Error: num1 or num2 is not a number

{ sum: '510' }

{ sum: 15 }

Which HTTP method is used to retrieve data?

GET

POST

DELETE

PUT

Which statement creates a Promise?

new Promise()

new Async()

create Promise()

Promise.create()

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

To use a middleware function

To set a custom port

To render a view

To define a route

Which method converts an object into JSON string?

JSON.stringify()

JSON.parse()

toJSON()

convertJSON()

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

mongoose

mongo-node

mongodb-connect

dbconnect

Which HTTP status indicates successful creation?

404

201

204

200

Which keyword is used to handle errors?

error

try…catch

catchError

handle

Which status code means “Not Found”?

404

200

301

500

In MongoDB, which command deletes an entire collection?

drop()

removeCollection()

deleteCollection()

clear()

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

response

res

send

request

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

app.port = 3000;

app.use(3000);

app.set('port', 3000);

app.listen(3000);

Which command installs MongoDB driver for Node.js?

node install mongodb

npm install mongoose-db

npm install mongodb

npm install mongo

Which command shows all collections in a MongoDB database?

db.collections()

show collections

show tables

list collections

Which method removes the last element from an array?

pop()

delete()

remove()

shift()

MongoDB stores data in which format?

Documents

Arrays

Tables

Rows

Which function in Express is used to start the server?

app.server()

app.run()

app.listen()

app.start()

Which method updates a document in MongoDB?

edit()

updateOne()

setOne()

modifyOne()

How do you define a route in Express.js?

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

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

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

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

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

String

Number

None of the above

Object

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

req.headers

req.query

req.body

req.params

Which method is used to insert a document in MongoDB?

insertOne()

create()

addOne()

push()

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

Run server automatically

Store application code

Manage project dependencies and metadata

Store database schema

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

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

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 });

What will be the output of the following code snippet?

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

Syntax Error

{first: 50, second: 30}

{first: 20, second: 30}

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

Which function delays execution for specified milliseconds?

delay()

pause()

wait()

setTimeout()

Which module is used to create a router in Express?

router.create()

express.route()

express.Router()

express.createRouter()

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