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json/docs/mkdocs/docs/examples/from_bon8.cpp
T
Niels Lohmann e94e164b07 Add BON8 support
Add to_bon8/from_bon8 and input_format_t::bon8 for BON8, a binary format
that uses the byte values that cannot begin a UTF-8 character as type
markers, so strings need no length prefix. It is the most compact of the
supported binary formats on the benchmark files.

The reader is non-recursive like the other binary readers. A string ends
at the first byte that cannot continue it, so the reader hands the one or
two bytes it reads past a string back to the value that follows. The
writer produces the canonical representation of the specification, except
for NFC normalization; its output is identical to that of the reference
implementation (HikoGUI) on all files of the test data.

The round-trip tests need the .bon8 files of json_test_data 3.2.0.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-09-24 22:53:08 +02:00

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#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create byte vector
std::vector<std::uint8_t> v = {0x89, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63, 0x74,
0xf9, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x74, 0xff,
0x42, 0x4f, 0x4e, 0x38, 0xff, 0x73, 0x63, 0x68,
0x65, 0x6d, 0x61, 0x90
};
// deserialize it with BON8
json j = json::from_bon8(v);
// print the deserialized JSON value
std::cout << std::setw(2) << j << std::endl;
}