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nlohmann
52 lines
3.0 KiB
Markdown
52 lines
3.0 KiB
Markdown
# Binary Formats
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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
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- [BJData](https://json.nlohmann.me/features/binary_formats/bjdata/index.md) (Binary JData),
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- [BSON](https://json.nlohmann.me/features/binary_formats/bson/index.md) (Binary JSON),
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- [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md) (Concise Binary Object Representation),
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- [MessagePack](https://json.nlohmann.me/features/binary_formats/messagepack/index.md), and
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- [UBJSON](https://json.nlohmann.me/features/binary_formats/ubjson/index.md) (Universal Binary JSON)
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to efficiently encode JSON values to byte vectors and to decode such vectors.
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## Comparison
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### Completeness
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| Format | Serialization | Deserialization |
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| ----------- | --------------------------------------------- | -------------------------------------------- |
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| BJData | complete | complete |
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| BSON | incomplete: top-level value must be an object | incomplete, but all JSON types are supported |
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| CBOR | complete | incomplete, but all JSON types are supported |
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| MessagePack | complete | complete |
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| UBJSON | complete | complete |
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### Binary values
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| Format | Binary values | Binary subtypes |
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| ----------- | ------------- | --------------- |
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| BJData | not supported | not supported |
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| BSON | supported | supported |
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| CBOR | supported | supported |
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| MessagePack | supported | supported |
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| UBJSON | not supported | not supported |
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See [binary values](https://json.nlohmann.me/features/binary_values/index.md) for more information.
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### Sizes
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| Format | canada.json | twitter.json | citm_catalog.json | jeopardy.json |
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| ------------------ | ----------- | ------------ | ----------------- | ------------- |
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| BJData | 53.2 % | 91.1 % | 78.1 % | 96.6 % |
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| BJData (size) | 58.6 % | 92.1 % | 86.7 % | 97.4 % |
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| BJData (size+type) | 58.6 % | 92.1 % | 86.5 % | 97.4 % |
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| BSON | 85.8 % | 95.2 % | 95.8 % | 106.7 % |
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| CBOR | 50.5 % | 86.3 % | 68.4 % | 88.0 % |
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| MessagePack | 50.5 % | 86.0 % | 68.5 % | 87.9 % |
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| UBJSON | 53.2 % | 91.3 % | 78.2 % | 96.6 % |
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| UBJSON (size) | 58.6 % | 92.3 % | 86.8 % | 97.4 % |
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| UBJSON (size+type) | 55.9 % | 92.3 % | 85.0 % | 95.0 % |
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Sizes compared to minified JSON value.
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