BSON data types overview in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to insert a document with a string field in MongoDB.

MongoDB

db.collection.insertOne({ name: [1] })

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

Anull

B123

C"Alice"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around string values.

Using numbers or booleans instead of strings.

The name field expects a string value, so we use quotes around the text.

2fill in blank

medium

Complete the code to insert a document with a boolean field in MongoDB.

MongoDB

db.collection.insertOne({ active: [1] })

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

A"true"

Btrue

C"false"

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around boolean values.

Using capitalized False instead of lowercase false.

The active field is a boolean, so we use the boolean value true without quotes.

3fill in blank

hard

Fix the error in the code to insert a document with a date field in MongoDB.

MongoDB

db.collection.insertOne({ createdAt: [1] })

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

Anew Date()

B"new Date()"

CDate()

Ddate()

Attempts:

3 left

💡 Hint

Common Mistakes

Putting new Date() inside quotes, making it a string.

Using Date() without new, which returns a string.

To store a date in BSON, use new Date() which creates a Date object. Quoting it makes it a string, which is incorrect.

4fill in blank

hard

Fill both blanks to create a document with an ObjectId and a null field.

MongoDB

db.collection.insertOne({ _id: [1], deletedAt: [2] })

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

AObjectId()

Bnull

Cundefined

Dnew ObjectId()

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined instead of null.

Using new ObjectId() which is valid but not the preferred shorthand here.

The _id field uses ObjectId() to create a unique ID. The deletedAt field is set to null to show no deletion date.

5fill in blank

hard

Fill all three blanks to create a document with a binary data field, a decimal number, and an array.

MongoDB

db.collection.insertOne({ data: [1], price: [2], tags: [3] })

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

ABinData(0, "AQID")

BDecimal128("19.99")

C["sale", "new"]

DBuffer.from("AQID")

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.from which is Node.js specific, not BSON.

Using strings instead of arrays for tags.

BinData stores binary data in BSON. Decimal128 stores precise decimal numbers. Arrays are represented with square brackets.