[#nlohmann-basic_json-0c-update-04]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.adoc[basic_json]::update
:relfileprefix: ../../
:mrdocs:

updates a JSON object from another object, overwriting existing keys

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
update(
    xref:nlohmann/basic_json-0c/const_reference.adoc[const_reference] j,
    bool merge_objects = false);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *j*
| JSON object with which to update this object
| *merge_objects*
| whether to merge nested objects recursively instead of overwriting them
|===


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