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nlohmann
2026-10-04 15:46:44 +00:00
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features/binary_formats/bjdata.md
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@@ -63,6 +63,15 @@ The library uses the following mapping from JSON values types to BJData types ac
- strings with more than 18446744073709551615 bytes, i.e., 2<sup>64</sup>-1 bytes (theoretical)
!!! warning "UTF-8 validation of string values and object keys"
BJData strings must use UTF-8 encoding. By default (the [`error_handler`](../../api/basic_json/to_bjdata.md)
parameter left at `keep`), `to_bjdata()` 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`](../../home/exceptions.md#jsonexceptiontype_error316) for ill-formed UTF-8 instead;
`replace`/`ignore` sanitize the string. [`JSON_STRICT_BINARY_UTF8`](../../api/macros/json_strict_binary_utf8.md)
makes `strict` the default.
!!! info "Unused BJData markers"
The following markers are not used in the conversion:
@@ -208,6 +217,19 @@ The library maps BJData types to JSON value types as follows:
The mapping is **complete** in the sense that any BJData value can be converted to a JSON value.
!!! warning "Ill-formed UTF-8 in string values and object keys"
BJData strings must use UTF-8 encoding, but checking it on read is opt-in: with the
[`error_handler`](../../api/basic_json/from_bjdata.md) parameter left at `keep` (the default), `from_bjdata()`
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_bjdata()` check and throw
[`parse_error.113`](../../home/exceptions.md#jsonexceptionparse_error113) for ill-formed UTF-8, and
`replace`/`ignore` sanitize the string instead of keeping it. However,
[`dump()`](../../api/basic_json/dump.md) still requires valid UTF-8 and throws
[`type_error.316`](../../home/exceptions.md#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_bjdata()`'s
own `error_handler` parameter defaults to `keep` (see above), so such a value is written back unchanged.
!!! info "Round trips"
A value returned by [`from_bjdata`](../../api/basic_json/from_bjdata.md) can be serialized with