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# Overview
Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance over a network. Hence, the library supports
- [BSON](bson) (Binary JSON),
- [CBOR](cbor) (Concise Binary Object Representation),
- [MessagePack](messagepack), and
- [UBJSON](ubjson) (Universal Binary JSON Specification)
to efficiently encode JSON values to byte vectors and to decode such vectors.
## Comparison
### Completeness
| Format | Serialization | Deserialization |
| ----------- |---------------------------------------------- | -------------------------------------------- |
| BSON | incomplete: top-level value must be an object | incomplete, but all JSON types are supported |
| CBOR | complete | incomplete, but all JSON types are supported |
| MessagePack | complete | complete |
| UBJSON | complete | complete |
### Binary values
| Format | Binary values | Binary subtypes |
| ----------- | ------------- | --------------- |
| BSON | supported | supported |
| CBOR | supported | not supported |
| MessagePack | supported | supported |
| UBJSON | not supported | not supported |
### Sizes
| Format | canada.json | twitter.json | citm_catalog.json | jeopardy.json |
| ------------------ | ----------- | ------------ | ----------------- | ------------- |
| BSON | 85,8 % | 95,2 % | 95,8 % | 106,7 % |
| CBOR | 50,5 % | 86,3 % | 68,4 % | 88,0 % |
| MessagePack | 50,6 % | 86,0 % | 68,5 % | 87,9 % |
| UBJSON | 53,2 % | 91,3 % | 78,2 % | 96,6 % |
| UBJSON (size) | 58,6 % | 92,3 % | 86,8 % | 97,4 % |
| UBJSON (size+type) | 55,9 % | 92,3 % | 85,0 % | 95,0 % |