MongoDB Data Types

Below are the main data types in MongoDB:

• String (“text”)
• Integer (int32, int64)
• Double (double)
• Boolean (true/false)
• Null
• Arrays
• Object / Embedded Document
• ObjectId
• Date
• Regular Expression (regex)
• Binary Data
• Timestamp

String (“text”)

• Most common data type.
• Stores text values in UTF-8 format.

{ "name": "Anuj Kumar" }

Integer (int32, int64)

• Stores numeric values.
• int32: For smaller numbers (−2,147,483,648 to 2,147,483,647).
• int64: For larger numbers.

{ "age": 25 }

Double (double)

• Stores floating-point numbers.

{ "price": 249.48 }

Boolean (true/false)

• Stores true/false values.

{ "isMarried": true }

Null

• Represents a null or missing value.

{ "middleName": null }

Arrays

• Stores multiple values in a single field.

{ "skills": ["PHP", "Python", "MongoDB"] }

Object / Embedded Document

• Stores a document inside another document.

{ 
  "address": { "city": "Delhi", "pin": 110001 } 
}

ObjectId

• A unique 12-byte ID is automatically generated for each document in a collection.

{ "_id": ObjectId("507f1f77bcf86cd799439011") }

Date

• Stores the current date/time in UTC format.

{ "createdAt": new Date(),
  "dob" : ISODate("2002-05-01T12:30:00Z")

}

Regular Expression (regex)

• Stores regex patterns for advanced queries.

{ "name": { "$regex": "^A" } }

Binary Data

• Stores binary data (e.g., images, files).

{ "file": BinData(0,"YW55IGNhcm5hbCBwbGVhc3VyZQ==") }

Timestamp

• Records a timestamp, often used internally by MongoDB for replication.

{ "lastUpdatedDate": Timestamp() }

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