Whitelist and transform options in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable whitelist in ValidationPipe.

NestJS

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

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

Afalse

Btrue

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Using false disables whitelist and allows extra properties.

Passing null or undefined causes runtime errors.

Setting whitelist to true removes properties that do not have decorators in DTOs.

2fill in blank

medium

Complete the code to enable automatic transformation in ValidationPipe.

NestJS

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

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

Atrue

Bfalse

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Setting transform to false disables automatic conversion.

Passing null or undefined does not enable transformation.

Setting transform to true converts payloads to DTO instances automatically.

3fill in blank

hard

Fix the error in the ValidationPipe options to whitelist and transform correctly.

NestJS

app.useGlobalPipes(new ValidationPipe({ whitelist: [1], transform: [2] }));

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

Afalse

Btrue

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Setting one option to false disables that feature.

Using null or undefined causes unexpected behavior.

Both whitelist and transform should be set to true to enable filtering and conversion.

4fill in blank

hard

Fill both blanks to configure ValidationPipe with whitelist and transform enabled.

NestJS

app.useGlobalPipes(new ValidationPipe({ whitelist: [1], transform: [2] }));

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

Atrue

Bfalse

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Setting either option to false disables that feature.

Using null or undefined leads to errors.

Both whitelist and transform must be true to filter unwanted properties and convert payloads.

5fill in blank

hard

Fill all three blanks to configure ValidationPipe with whitelist, transform, and forbidNonWhitelisted options.

NestJS

app.useGlobalPipes(new ValidationPipe({ whitelist: [1], transform: [2], forbidNonWhitelisted: [3] }));

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

Atrue

Bfalse

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Setting forbidNonWhitelisted to true causes validation errors on extra properties.

Using null or undefined for any option causes unexpected behavior.

Enable whitelist and transform by setting them to true. Set forbidNonWhitelisted to false to allow extra properties without error.