Why structured errors improve API quality in NestJS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to throw a structured error with a message.

NestJS

throw new HttpException({ message: [1] }, HttpStatus.BAD_REQUEST);

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

A"Invalid input"

BInvalid input

C400

DHttpStatus.BAD_REQUEST

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the message string

Using a number instead of a string for the message

The error message must be a string inside quotes to be valid JSON in the error body.

2fill in blank

medium

Complete the code to create a structured error with a custom error code.

NestJS

throw new HttpException({ message: 'Not found', code: [1] }, HttpStatus.NOT_FOUND);

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

A"404_NOT_FOUND"

B404_NOT_FOUND

CHttpStatus.NOT_FOUND

D"NOT_FOUND"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a string

Omitting quotes around the code

The error code should be a string inside quotes to be part of the structured error object.

3fill in blank

hard

Fix the error in the code to properly return a structured error response.

NestJS

return response.status(HttpStatus.BAD_REQUEST).json({ error: [1] });

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

A"Bad Request"

BHttpStatus.BAD_REQUEST

C{ message: 'Bad Request' }

DBad Request

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a plain string instead of an object

Using a variable without quotes

The error field should be an object with a message property for structured errors.

4fill in blank

hard

Fill both blanks to create a structured error with message and details.

NestJS

throw new HttpException({ message: [1], details: [2] }, HttpStatus.CONFLICT);

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

A"Conflict occurred"

B"Resource already exists"

C{ resource: 'User' }

D[ 'Duplicate entry' ]

Attempts:

3 left

💡 Hint

Common Mistakes

Using array instead of object for details

Omitting quotes around message

The message is a string describing the error, and details is an object with extra info.

5fill in blank

hard

Fill all three blanks to create a structured error with message, code, and timestamp.

NestJS

throw new HttpException({ message: [1], code: [2], timestamp: [3] }, HttpStatus.INTERNAL_SERVER_ERROR);

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

A"Server error"

B"500_INTERNAL_ERROR"

Cnew Date().toISOString()

DDate.now()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Date.now() which returns a number instead of string

Omitting quotes around strings

The message and code are strings, and timestamp is an ISO string from the current date.