[#nlohmann-basic_json-0c-contains-07]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.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-0c/json_pointer.adoc[json_pointer] const& ptr) const;
----

== Return Value

whether the JSON pointer resolves to an existing element

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ptr*
| JSON pointer to the element to check for
|===


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