[#nlohmann-basic_json-0e-2constructor-03]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0e.adoc[basic_json<>]::basic_json
:relfileprefix: ../../
:mrdocs:

create a JSON value from an existing one

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename BasicJsonType>
requires detail::is_basic_json<BasicJsonType>::value&& !std::is_same<basic_json, BasicJsonType>::value
basic_json(BasicJsonType const& val);
----

== Parameters

[cols=2]
|===
| Name
| Description
| *val*
| The object to copy construct from
|===


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