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nlohmann
2026-10-04 15:46:44 +00:00
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features/binary_formats/ubjson/index.html
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features/binary_formats/ubjson/index.md
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@@ -46,6 +46,10 @@ The following values can **not** be converted to a UBJSON value:
- strings with more than 9223372036854775807 bytes (theoretical)
UTF-8 validation of string values and object keys
UBJSON's required string encoding is UTF-8. By default (the [`error_handler`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md) parameter left at `keep`), `to_ubjson()` writes the bytes of string values and object keys unchanged, even if they are not valid UTF-8. With `error_handler_t::strict`, it throws [`type_error.316`](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error316) for ill-formed UTF-8 instead; `replace`/`ignore` sanitize the string. [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md) makes `strict` the default.
Unused UBJSON markers
The following markers are not used in the conversion:
@@ -173,6 +177,10 @@ Complete mapping
The mapping is **complete** in the sense that any UBJSON value can be converted to a JSON value.
Ill-formed UTF-8 in string values and object keys
UBJSON's required string encoding is UTF-8, but checking it on read is opt-in: with the [`error_handler`](https://json.nlohmann.me/api/basic_json/from_ubjson/index.md) parameter left at `keep` (the default), `from_ubjson()` accepts a string value or object key whose bytes are not valid UTF-8 and hands them back unchanged. Passing `error_handler_t::strict` makes `from_ubjson()` check and throw [`parse_error.113`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error113) for ill-formed UTF-8, and `replace`/`ignore` sanitize the string instead of keeping it. However, [`dump()`](https://json.nlohmann.me/api/basic_json/dump/index.md) still requires valid UTF-8 and throws [`type_error.316`](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error316) for a value read with the default `keep` handler, unless an error handler is passed that replaces or ignores the ill-formed bytes. `to_ubjson()`'s own `error_handler` parameter defaults to `keep` (see above), so such a value is written back unchanged.
Example: deserialize a JSON value from UBJSON
```