diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55fa89b0..ea84b2f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ HEAD
    - `is<T>()` returns `false` if the integer `T` overflows
 * Added `BasicJsonDocument` to support custom allocator (issue #876)
 * Added `JsonDocument::containsKey()` (issue #938)
+* Added `JsonVariant::containsKey()`
 
 v6.9.1 (2019-03-01)
 ------
diff --git a/src/ArduinoJson/Array/ArrayRef.hpp b/src/ArduinoJson/Array/ArrayRef.hpp
index 8197d0d3..e34b6233 100644
--- a/src/ArduinoJson/Array/ArrayRef.hpp
+++ b/src/ArduinoJson/Array/ArrayRef.hpp
@@ -78,6 +78,10 @@ class ArrayConstRef : public ArrayRefBase<const CollectionData>,
   }
 
   FORCE_INLINE VariantConstRef operator[](size_t index) const {
+    return getElement(index);
+  }
+
+  FORCE_INLINE VariantConstRef getElement(size_t index) const {
     return VariantConstRef(_data ? _data->get(index) : 0);
   }
 };
diff --git a/src/ArduinoJson/Document/JsonDocument.hpp b/src/ArduinoJson/Document/JsonDocument.hpp
index 7789e6fd..b070af54 100644
--- a/src/ArduinoJson/Document/JsonDocument.hpp
+++ b/src/ArduinoJson/Document/JsonDocument.hpp
@@ -129,14 +129,14 @@ class JsonDocument : public Visitable {
   // containsKey(const __FlashStringHelper*) const
   template <typename TChar>
   bool containsKey(TChar* key) const {
-    return as<ObjectRef>().containsKey(key);
+    return !getMember(key).isUndefined();
   }
 
   // containsKey(const std::string&) const
   // containsKey(const String&) const
   template <typename TString>
   bool containsKey(const TString& key) const {
-    return as<ObjectRef>().containsKey(key);
+    return !getMember(key).isUndefined();
   }
 
   // operator[](const std::string&)
@@ -165,7 +165,7 @@ class JsonDocument : public Visitable {
   FORCE_INLINE
       typename enable_if<IsString<TString>::value, VariantConstRef>::type
       operator[](const TString& key) const {
-    return getVariant()[key];
+    return getMember(key);
   }
 
   // operator[](char*) const
@@ -175,7 +175,7 @@ class JsonDocument : public Visitable {
   FORCE_INLINE
       typename enable_if<IsString<TChar*>::value, VariantConstRef>::type
       operator[](TChar* key) const {
-    return getVariant()[key];
+    return getMember(key);
   }
 
   FORCE_INLINE ElementProxy<JsonDocument&> operator[](size_t index) {
@@ -183,23 +183,44 @@ class JsonDocument : public Visitable {
   }
 
   FORCE_INLINE VariantConstRef operator[](size_t index) const {
-    return VariantConstRef(_data.getElement(index));
+    return getElement(index);
   }
 
   FORCE_INLINE VariantRef getElement(size_t index) {
     return VariantRef(&_pool, _data.getElement(index));
   }
 
-  // getMember(char*) const
-  // getMember(const char*) const
-  // getMember(const __FlashStringHelper*) const
+  FORCE_INLINE VariantConstRef getElement(size_t index) const {
+    return VariantConstRef(_data.getElement(index));
+  }
+
+  // JsonVariantConst getMember(char*) const
+  // JsonVariantConst getMember(const char*) const
+  // JsonVariantConst getMember(const __FlashStringHelper*) const
+  template <typename TChar>
+  FORCE_INLINE VariantConstRef getMember(TChar* key) const {
+    return VariantConstRef(_data.getMember(adaptString(key)));
+  }
+
+  // JsonVariantConst getMember(const std::string&) const
+  // JsonVariantConst getMember(const String&) const
+  template <typename TString>
+  FORCE_INLINE
+      typename enable_if<IsString<TString>::value, VariantConstRef>::type
+      getMember(const TString& key) const {
+    return VariantConstRef(_data.getMember(adaptString(key)));
+  }
+
+  // JsonVariant getMember(char*)
+  // JsonVariant getMember(const char*)
+  // JsonVariant getMember(const __FlashStringHelper*)
   template <typename TChar>
   FORCE_INLINE VariantRef getMember(TChar* key) {
     return VariantRef(&_pool, _data.getMember(adaptString(key)));
   }
 
-  // getMember(const std::string&) const
-  // getMember(const String&) const
+  // JsonVariant getMember(const std::string&)
+  // JsonVariant getMember(const String&)
   template <typename TString>
   FORCE_INLINE typename enable_if<IsString<TString>::value, VariantRef>::type
   getMember(const TString& key) {
diff --git a/src/ArduinoJson/Object/MemberProxy.hpp b/src/ArduinoJson/Object/MemberProxy.hpp
index a2dbec69..5f7c66f9 100644
--- a/src/ArduinoJson/Object/MemberProxy.hpp
+++ b/src/ArduinoJson/Object/MemberProxy.hpp
@@ -40,9 +40,9 @@ class MemberProxy : public VariantOperators<MemberProxy<TObject, TStringRef> >,
     return *this;
   }
 
-  // operator=(char*) const
-  // operator=(const char*) const
-  // operator=(const __FlashStringHelper*) const
+  // operator=(char*)
+  // operator=(const char*)
+  // operator=(const __FlashStringHelper*)
   template <typename TChar>
   FORCE_INLINE this_type &operator=(TChar *src) {
     getOrAddUpstreamMember().set(src);
diff --git a/src/ArduinoJson/Object/ObjectFunctions.hpp b/src/ArduinoJson/Object/ObjectFunctions.hpp
index aede1817..a89b45e8 100644
--- a/src/ArduinoJson/Object/ObjectFunctions.hpp
+++ b/src/ArduinoJson/Object/ObjectFunctions.hpp
@@ -16,11 +16,6 @@ void objectAccept(const CollectionData *obj, Visitor &visitor) {
     visitor.visitNull();
 }
 
-template <typename TAdaptedString>
-inline bool objectContainsKey(const CollectionData *obj, TAdaptedString key) {
-  return obj && obj->containsKey(key);
-}
-
 inline bool objectEquals(const CollectionData *lhs, const CollectionData *rhs) {
   if (lhs == rhs) return true;
   if (!lhs || !rhs) return false;
diff --git a/src/ArduinoJson/Object/ObjectImpl.hpp b/src/ArduinoJson/Object/ObjectImpl.hpp
index 6136cf0a..ab0b8182 100644
--- a/src/ArduinoJson/Object/ObjectImpl.hpp
+++ b/src/ArduinoJson/Object/ObjectImpl.hpp
@@ -35,4 +35,18 @@ inline ObjectRef ObjectShortcuts<TObject>::createNestedObject(
     TChar* key) const {
   return impl()->getOrAddMember(key).template to<ObjectRef>();
 }
+
+template <typename TObject>
+template <typename TString>
+inline typename enable_if<IsString<TString>::value, bool>::type
+ObjectShortcuts<TObject>::containsKey(const TString& key) const {
+  return !impl()->getMember(key).isUndefined();
+}
+
+template <typename TObject>
+template <typename TChar>
+inline typename enable_if<IsString<TChar*>::value, bool>::type
+ObjectShortcuts<TObject>::containsKey(TChar* key) const {
+  return !impl()->getMember(key).isUndefined();
+}
 }  // namespace ARDUINOJSON_NAMESPACE
diff --git a/src/ArduinoJson/Object/ObjectRef.hpp b/src/ArduinoJson/Object/ObjectRef.hpp
index 0a8063e7..084f66ee 100644
--- a/src/ArduinoJson/Object/ObjectRef.hpp
+++ b/src/ArduinoJson/Object/ObjectRef.hpp
@@ -27,21 +27,6 @@ class ObjectRefBase {
     objectAccept(_data, visitor);
   }
 
-  // containsKey(const std::string&) const
-  // containsKey(const String&) const
-  template <typename TString>
-  FORCE_INLINE bool containsKey(const TString& key) const {
-    return objectContainsKey(_data, adaptString(key));
-  }
-
-  // containsKey(char*) const
-  // containsKey(const char*) const
-  // containsKey(const __FlashStringHelper*) const
-  template <typename TChar>
-  FORCE_INLINE bool containsKey(TChar* key) const {
-    return objectContainsKey(_data, adaptString(key));
-  }
-
   FORCE_INLINE bool isNull() const {
     return _data == 0;
   }
@@ -83,6 +68,21 @@ class ObjectConstRef : public ObjectRefBase<const CollectionData>,
     return iterator();
   }
 
+  // containsKey(const std::string&) const
+  // containsKey(const String&) const
+  template <typename TString>
+  FORCE_INLINE bool containsKey(const TString& key) const {
+    return !getMember(key).isUndefined();
+  }
+
+  // containsKey(char*) const
+  // containsKey(const char*) const
+  // containsKey(const __FlashStringHelper*) const
+  template <typename TChar>
+  FORCE_INLINE bool containsKey(TChar* key) const {
+    return !getMember(key).isUndefined();
+  }
+
   // getMember(const std::string&) const
   // getMember(const String&) const
   template <typename TString>
diff --git a/src/ArduinoJson/Object/ObjectShortcuts.hpp b/src/ArduinoJson/Object/ObjectShortcuts.hpp
index 7b1081af..bf5f6100 100644
--- a/src/ArduinoJson/Object/ObjectShortcuts.hpp
+++ b/src/ArduinoJson/Object/ObjectShortcuts.hpp
@@ -15,6 +15,19 @@ class MemberProxy;
 template <typename TObject>
 class ObjectShortcuts {
  public:
+  // containsKey(const std::string&) const
+  // containsKey(const String&) const
+  template <typename TString>
+  FORCE_INLINE typename enable_if<IsString<TString>::value, bool>::type
+  containsKey(const TString &key) const;
+
+  // containsKey(char*) const
+  // containsKey(const char*) const
+  // containsKey(const __FlashStringHelper*) const
+  template <typename TChar>
+  FORCE_INLINE typename enable_if<IsString<TChar *>::value, bool>::type
+  containsKey(TChar *key) const;
+
   // operator[](const std::string&) const
   // operator[](const String&) const
   template <typename TString>
diff --git a/src/ArduinoJson/Variant/VariantRef.hpp b/src/ArduinoJson/Variant/VariantRef.hpp
index 5dd29315..cf3a438d 100644
--- a/src/ArduinoJson/Variant/VariantRef.hpp
+++ b/src/ArduinoJson/Variant/VariantRef.hpp
@@ -96,6 +96,10 @@ class VariantRefBase {
     return variantIsNull(_data);
   }
 
+  FORCE_INLINE bool isUndefined() const {
+    return !_data;
+  }
+
   FORCE_INLINE size_t memoryUsage() const {
     return _data ? _data->memoryUsage() : 0;
   }
diff --git a/test/JsonVariant/CMakeLists.txt b/test/JsonVariant/CMakeLists.txt
index 64a78f78..87ddd409 100644
--- a/test/JsonVariant/CMakeLists.txt
+++ b/test/JsonVariant/CMakeLists.txt
@@ -7,6 +7,7 @@ add_executable(JsonVariantTests
 	as.cpp
 	clear.cpp
 	compare.cpp
+	containsKey.cpp
 	copy.cpp
 	createNested.cpp
 	is.cpp
diff --git a/test/JsonVariant/containsKey.cpp b/test/JsonVariant/containsKey.cpp
new file mode 100644
index 00000000..aa51a225
--- /dev/null
+++ b/test/JsonVariant/containsKey.cpp
@@ -0,0 +1,28 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <stdint.h>
+#include <catch.hpp>
+
+static const char* null = 0;
+
+TEST_CASE("JsonVariant::containsKey()") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant var = doc.to<JsonVariant>();
+
+  SECTION("containsKey(const char*) returns true") {
+    var["hello"] = "world";
+
+    REQUIRE(var.containsKey("hello") == true);
+    REQUIRE(var.containsKey("world") == false);
+  }
+
+  SECTION("containsKey(std::string) returns true") {
+    var["hello"] = "world";
+
+    REQUIRE(var.containsKey(std::string("hello")) == true);
+    REQUIRE(var.containsKey(std::string("world")) == false);
+  }
+}
diff --git a/test/MemberProxy/CMakeLists.txt b/test/MemberProxy/CMakeLists.txt
index 60c70c8c..e948c656 100644
--- a/test/MemberProxy/CMakeLists.txt
+++ b/test/MemberProxy/CMakeLists.txt
@@ -5,6 +5,7 @@
 add_executable(MemberProxyTests
 	add.cpp
 	clear.cpp
+	containsKey.cpp
 	remove.cpp
 	set.cpp
 	size.cpp
diff --git a/test/MemberProxy/containsKey.cpp b/test/MemberProxy/containsKey.cpp
new file mode 100644
index 00000000..c0acdc74
--- /dev/null
+++ b/test/MemberProxy/containsKey.cpp
@@ -0,0 +1,27 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("MemberProxy::containsKey()") {
+  DynamicJsonDocument doc(4096);
+  MemberProxy<JsonDocument&, const char*> mp = doc["hello"];
+
+  SECTION("containsKey(const char*)") {
+    mp["key"] = "value";
+
+    REQUIRE(mp.containsKey("key") == true);
+    REQUIRE(mp.containsKey("key") == true);
+  }
+
+  SECTION("containsKey(std::string)") {
+    mp["key"] = "value";
+
+    REQUIRE(mp.containsKey(std::string("key")) == true);
+    REQUIRE(mp.containsKey(std::string("key")) == true);
+  }
+}