JWT generation in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a JWT token with a subject.

Spring Boot

String token = Jwts.builder().setSubject([1]).compact();

Drag options to blanks, or click blank then click option'

A"user123"

Bsubject

C123user

Duser123

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the subject string.

Passing a variable without quotes that is not defined.

The setSubject method requires a string value representing the subject of the token. It must be a string literal or variable containing a string.

2fill in blank

medium

Complete the code to sign the JWT token with a secret key.

Spring Boot

String token = Jwts.builder().signWith([1]).compact();

Drag options to blanks, or click blank then click option'

AKeys.secretKeyFor(SignatureAlgorithm.HS256)

BSignatureAlgorithm.HS256

C"secret"

Dnew SecretKey()

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the algorithm enum directly instead of a Key.

Using a plain string instead of a Key object.

The signWith method requires a Key object, which can be created using Keys.secretKeyFor(SignatureAlgorithm.HS256) to generate a secure key.

3fill in blank

hard

Fix the error in setting the expiration date for the JWT token.

Spring Boot

Date expiryDate = new Date(System.currentTimeMillis() [1] 3600000);

Drag options to blanks, or click blank then click option'

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction which sets expiration in the past.

Using multiplication or division which is incorrect here.

To set the expiration one hour from now, add 3600000 milliseconds (1 hour) to the current time.

4fill in blank

hard

Fill both blanks to add claims and set expiration in the JWT builder.

Spring Boot

String token = Jwts.builder().claim("role", [1]).setExpiration([2]).compact();

Drag options to blanks, or click blank then click option'

A"admin"

Bnew Date()

CexpiryDate

D"user"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a Date for expiration.

Passing an undefined variable for claim value.

The claim value should be a string like "admin". The expiration should be a Date object like expiryDate representing the expiration time.

5fill in blank

hard

Fill all three blanks to build a JWT token with subject, claim, and expiration.

Spring Boot

String token = Jwts.builder().setSubject([1]).claim("scope", [2]).setExpiration([3]).compact();

Drag options to blanks, or click blank then click option'

A"user42"

B"read:write"

CexpiryDate

D"admin"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings for expiration instead of Date.

Mixing up claim values.

The subject is a string like "user42". The claim value for "scope" is a string like "read:write". The expiration is a Date object like expiryDate.