Data Types in MongoDB

MongoDB supports a wide range of data types as values in documents, we will discuss those below

Basic Data Types

Documents in MongoDB can be thought of as "JSON-like" in that they are conceptually similar to objects in JavaScript. JSON expressive capability is limited as there are null, Boolean, numeric, string, array, and object.

Although these data types allow for an impressive amount of expressiveness. There are a couple of additional types which are crucial for most applications.

NULL

Null can be used to represent both a null value and nonexistent field

{"x" : null}

BOOLEAN

This is used to represent values 'true' and 'false'

{"x" : true}

64 Bit floating point number :

all numbers are represented with this data type, thus this will be a floating point number

{"x" : 3.14}

as this will be

{"x" : 3}

String

any string characters can be represented with this data type

{"x" : "header"}

Symbol

This is not supported in the MongoDB shell, it will be converted to a string

object_id

object id is 12 bytes unique ID for documents.

{"x" ObjectId()}

DATE

Dates are stored as milliseconds since the epoch, timezone is not stored.

{"x" : new Date()}

Regular Expression

Documents can contain regular expressions, using java scripts regular expression

{"x" : /header/i}

Code

Documents can also contain JavaScipt code

{"x" : function () {/*......*/}}

Binary Data

Binary data is a string of arbitrary bytes, It can not be manipulated from the shell.

Maximum Value

BSON contains a special type representing the largest possible value. MongoDB does not have this type

Minimum Value

BSON contains a special type representing the smallest possible value. MongoDB does not have this type

Undefined

Undefined can be used in documents as well

{"x" : undefined}

Array

sets or lists  of values can be represented as arrays

{"x" : ["a", "b", "c"]}

Embedded Document

Documents can contain entire documents

{"x" : {"y": "z"}}

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