check the existence of an element in a JSON object

Synopsis

Declared in <nlohmann/json.hpp>

template<class KeyType>
requires detail::is_usable_as_basic_json_key_type<basic_json_t, KeyType>::value
bool
contains(KeyType&& key) const;

Return Value

whether the JSON object contains an element with the given key

Parameters

Name

Description

key

key to check for

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