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nlohmann committed 2026-10-12 07:35:31 +00:00
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@@ -51,13 +51,36 @@ The library uses the following mapping from JSON values types to BSON types:
??? example "Example: serialize a JSON value to BSON"
```cpp
--8<-- "examples/to_bson.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
using namespace nlohmann::literals;
int main()
{
// create a JSON value
json j = R"({"compact": true, "schema": 0})"_json;
// serialize it to BSON
std::vector<std::uint8_t> v = json::to_bson(j);
// print the vector content
for (auto& byte : v)
{
std::cout << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << " ";
}
std::cout << std::endl;
}
```
Output:
```c
--8<-- "examples/to_bson.output"
0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00
```
@@ -128,11 +151,36 @@ The library maps BSON record types to JSON value types as follows:
??? example "Example: deserialize a JSON value from BSON"
```cpp
--8<-- "examples/from_bson.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create byte vector
std::vector<std::uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d,
0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73,
0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00
};
// deserialize it with BSON
json j = json::from_bson(v);
// print the deserialized JSON value
std::cout << std::setw(2) << j << std::endl;
}
```
Output:
```json
--8<-- "examples/from_bson.output"
{
"compact": true,
"schema": 0
}
```