diff --git a/src/util/json/value.cpp b/src/util/json/value.cpp
index b535bc0..8b5d9fa 100644
--- a/src/util/json/value.cpp
+++ b/src/util/json/value.cpp
@@ -146,6 +146,17 @@ void Value::emplace(const std::string& key, Value value)
 	m_value.asObject->emplace(key, value);
 }
 
+bool Value::exists(size_t index) const
+{
+	return index < size();
+}
+
+bool Value::exists(const std::string& key) const
+{
+	assert(m_type == Type::Object);
+	return m_value.asObject->members().find(key) != m_value.asObject->members().end();
+}
+
 // ------------------------------------------
 
 Value& Value::operator[](size_t index)
diff --git a/src/util/json/value.h b/src/util/json/value.h
index a7c8bf9..93481b2 100644
--- a/src/util/json/value.h
+++ b/src/util/json/value.h
@@ -55,6 +55,9 @@ public:
 	void emplace_back(Value value);
 	void emplace(const std::string& key, Value value);
 
+	bool exists(size_t index) const;
+	bool exists(const std::string& key) const;
+
 	// --------------------------------------
 
 	// Array index operator