Mongo-db-

Mongodb Data Types

May 18, 2023

 MongoDB is a NoSQL database that supports various data types for storing data in documents. Each field in a MongoDB document can have a specific data type. Here’s an overview of the commonly used data types in MongoDB:

1. String

  • Used to store textual data.
  • Example: "name": "John Doe"

2. Number

MongoDB provides two number types:

  • Integer: 32-bit or 64-bit integers, depending on your platform.
    • Example: "age": 30
  • Double: For floating-point values.
    • Example: "price": 19.99

3. Boolean

  • Used to store true or false values.
  • Example: "isActive": true

4. Date

  • Stores dates and times as ISO 8601 format.
  • Example: "createdAt": ISODate("2024-12-14T00:00:00Z")

5. Array

  • Used to store a list of values.
  • Example: "tags": ["mongodb", "database", "nosql"]

6. Object (Embedded Document)

  • Stores a nested document (key-value pairs within another document).
  • Example:
    "address": {
  "city": "New York",
  "zip": "10001"
}

7. ObjectId

  • A 12-byte unique identifier for documents created automatically unless specified.
  • Example: "id": ObjectId("507f1f77bcf86cd799439011")

8. Binary Data

  • Stores binary data like images or files.
  • Example: "file": BinData(0, "binaryContentInBase64")

9. Null

  • Represents a null value or an empty field.
  • Example: "middleName": null

10. Regular Expression

  • Stores regex patterns.
  • Example: "pattern": /mongodb/i

11. JavaScript Code

  • Used to store JavaScript code snippets.
  • Example: "script": function() { return this.name; }

12. Decimal128

  • A high-precision 128-bit decimal type, useful for financial and monetary data.
  • Example: "salary": NumberDecimal("12345.67")

13. MinKey

  • Represents the smallest value for sorting and comparison.
  • Used internally for specific queries.
  • Example: "key": MinKey

14. MaxKey

  • Represents the largest value for sorting and comparison.
  • Example: "key": MaxKey

15. Timestamp

  • Special internal type for storing timestamps, primarily used by MongoDB’s replication system.
  • Example: "updatedAt": Timestamp(1609459200, 1)

16. Undefined

  • Represents an undefined value (deprecated in favor of null).
  • Example: "optionalField": undefined

These data types provide flexibility and efficiency when designing MongoDB schemas, allowing developers to handle various types of data easily.