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api/basic_json/to_msgpack.md

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+# <small>nlohmann::basic_json::</small>to_msgpack
+
+```cpp
+// (1)
+static std::vector<std::uint8_t> to_msgpack(const basic_json& j);
+
+// (2)
+static void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o);
+static void to_msgpack(const basic_json& j, detail::output_adapter<char> o);
+```
+
+Serializes a given JSON value `j` to a byte vector using the MessagePack serialization format. MessagePack is a binary
+serialization format that aims to be more compact than JSON itself, yet more efficient to parse.
+
+1. Returns a byte vector containing the MessagePack serialization.
+2. Writes the MessagePack serialization to an output adapter.
+
+The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/messagepack.md).
+
+## Parameters
+
+`j` (in)
+:   JSON value to serialize
+
+`o` (in)
+:   output adapter to write serialization to
+
+## Return value
+
+1. MessagePack serialization as a byte vector
+2. (none)
+
+## Exception safety
+
+Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
+
+## Complexity
+
+Linear in the size of the JSON value `j`.
+
+## Examples
+
+??? example
+
+    The example shows the serialization of a JSON value to a byte vector in MessagePack format.
+     
+    ```cpp
+    --8<-- "examples/to_msgpack.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/to_msgpack.output"
+    ```
+
+## See also
+
+- [from_msgpack](from_msgpack.md) create a JSON value from an input in MessagePack format
+- [to_cbor](to_cbor.md) create a CBOR serialization of a JSON value
+- [to_bson](to_bson.md) create a BSON serialization of a JSON value
+- [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
+- [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
+
+## Version history
+
+- Added in version 2.0.9.