ValidationPipe in depth in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply ValidationPipe globally in a NestJS app.

NestJS

app.useGlobalPipes(new [1]());

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

AValidationPipe

BParseIntPipe

CAuthGuard

DLogger

Attempts:

3 left

💡 Hint

Common Mistakes

Using a pipe that does not validate data like ParseIntPipe.

Forgetting to create a new instance with parentheses.

The ValidationPipe is used to validate incoming requests globally in NestJS.

2fill in blank

medium

Complete the code to enable automatic transformation of input data types in ValidationPipe.

NestJS

app.useGlobalPipes(new ValidationPipe({ [1]: true }));

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

Atransform

Bwhitelist

CforbidNonWhitelisted

DskipMissingProperties

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'whitelist' with 'transform'.

Not enabling transform causes input to remain strings.

The transform option converts input data to the expected types automatically.

3fill in blank

hard

Fix the error in the code to forbid properties not in the DTO during validation.

NestJS

app.useGlobalPipes(new ValidationPipe({ [1]: true }));

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

AskipMissingProperties

BdisableErrorMessages

Ctransform

DforbidNonWhitelisted

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'whitelist' instead of 'forbidNonWhitelisted'.

Not enabling this option allows extra properties silently.

The forbidNonWhitelisted option throws an error if extra properties are sent.

4fill in blank

hard

Fill both blanks to create a ValidationPipe that strips unknown properties and skips missing ones.

NestJS

new ValidationPipe({ [1]: true, [2]: true })

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

Awhitelist

BskipMissingProperties

CforbidNonWhitelisted

Dtransform

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'forbidNonWhitelisted' with 'whitelist'.

Not using 'skipMissingProperties' when optional fields are missing.

whitelist removes unknown properties, and skipMissingProperties allows missing optional fields.

5fill in blank

hard

Fill all three blanks to create a ValidationPipe with transformation, whitelist, and forbidding unknown properties.

NestJS

new ValidationPipe({ [1]: true, [2]: true, [3]: true })

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

AskipMissingProperties

Bwhitelist

CforbidNonWhitelisted

Dtransform

Attempts:

3 left

💡 Hint

Common Mistakes

Missing one of the three options causes unexpected behavior.

Confusing 'skipMissingProperties' with 'forbidNonWhitelisted'.

This pipe transforms input types, removes unknown properties, and forbids extra properties.