[#nlohmann-basic_json-00-contains-01]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-00.adoc[basic_json]::contains
:relfileprefix: ../../
:mrdocs:

check the existence of an element in a JSON object given a JSON pointer

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
contains(xref:nlohmann/basic_json-00/json_pointer.adoc[json_pointer] const& ptr) const;
----

== Parameters

[cols=2]
|===
| Name
| Description
| *ptr*
| JSON Pointer, see xref:nlohmann/json_pointer-0b.adoc[`nlohmann::json_pointer`]
|===


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