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

Subscript operator

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:nlohmann/basic_json-0e/const_reference.adoc[const_reference]
operator[](object_t::key_type const& key) const;
----

== Return Value

the type of an element const reference

== Parameters

[cols=2]
|===
| Name
| Description
| *key*
| The right operand
|===


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