Filename extension .bson Type of format Data interchange Standard no RFC yet | Internet media type none Extended from JSON Website bsonspec.org | |
BSON /ˈbiːsən/ is a computer data interchange format used mainly as a data storage and network transfer format in the MongoDB database. It is a binary form for representing simple data structures, associative arrays (called objects or documents in MongoDB), and various data types of specific interest to MongoDB. The name "BSON" is based on the term JSON and stands for "Binary JSON".
Contents
Data types and syntax
BSON documents (objects) consist of an ordered list of elements. Each element consists of a field name, a type, and a value. Field names are strings. Types include:
true
and false
)BSON types are nominally a superset of JSON types (JSON does not have a date or a byte array type, for example), with one exception of not having a universal "number" type as JSON does.
Efficiency
Compared to JSON, BSON is designed to be efficient both in storage space and scan-speed. Large elements in a BSON document are prefixed with a length field to facilitate scanning. In some cases, BSON will use more space than JSON due to the length prefixes and explicit array indices.
Example
A document such as {"hello":"world"} will be stored as: