[#BloombergLP-bdljsn-Json-operator_subs-07]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::xref:BloombergLP/bdljsn/Json.adoc[Json]::operator[]
:relfileprefix: ../../../
:mrdocs:

Return a modifiable reference to the held object's member for `key`.

== Synopsis

Declared in `<bdljsn_json.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdljsn/Json.adoc[Json]&
operator[](std::string_view const& key);
----

== Description

Return a reference providing modifiable access to the `Json` object associated with the specified `key` in the `JsonObject` held by this object. If `isNull()`, then type is changed to object. If the `JsonObject` does not already contain a `Json` object associated with `key`, first insert a new default‐constructed `Json` object associated with `key`. The behavior is undefined unless `isObject()` or `isNull()`.

== Return Value

modifiable reference to the held object's member for `key`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| UTF‐8 member name
|===


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