Data Types and Conventions

MongoDB (BSON) Data Types

Mongo uses special data types in addition to the basic JSON types of string, integer, boolean, double, null, array, and object. These types include date, object id, binary data, regular expression, and code. Each driver implements these types in language-specific ways, see your driver's documentation for details.

See BSON for a full list of database types.

Internationalization

See Internationalized strings

Database References

See Database References and Schema Design

Checking Types from the Shell

Floats and ints are treating as standard javascript numbers, and are thus hard to tell apart in the shell.

> // v1.8+ shell
> x
{
        "_id" : ObjectId("4dcd3ebc9278000000005158"),
        "d" : ISODate("2011-05-13T14:22:46.777Z"),
        "b" : BinData(0,""),
        "c" : "aa",
        "n" : 3,
        "e" : [ ],
        "n2" : NumberLong(33)
}
> x.d instanceof Date
true
> x.b instanceof BinData
true
> typeof x
object
> typeof x.b
object
> typeof x.n
number
> typeof x.n
number
> typeof x.n2
object
> x.n2 instanceof NumberLong
true
> typeof x.c
string

Data Types and Conventions

MongoDB (BSON) Data Types

Internationalization

Database References

Checking Types from the Shell

Labels

Children (5)