diff --git a/AK/JsonArray.h b/AK/JsonArray.h
index 575549def2..c314fec7aa 100644
--- a/AK/JsonArray.h
+++ b/AK/JsonArray.h
@@ -48,11 +48,11 @@ public:
         return *this;
     }
 
-    size_t size() const { return m_values.size(); }
-    bool is_empty() const { return m_values.is_empty(); }
+    [[nodiscard]] size_t size() const { return m_values.size(); }
+    [[nodiscard]] bool is_empty() const { return m_values.is_empty(); }
 
-    JsonValue const& at(size_t index) const { return m_values.at(index); }
-    JsonValue const& operator[](size_t index) const { return at(index); }
+    [[nodiscard]] JsonValue const& at(size_t index) const { return m_values.at(index); }
+    [[nodiscard]] JsonValue const& operator[](size_t index) const { return at(index); }
 
     void clear() { m_values.clear(); }
     void append(JsonValue value) { m_values.append(move(value)); }
@@ -64,7 +64,7 @@ public:
     template<typename Builder>
     void serialize(Builder&) const;
 
-    String to_string() const { return serialized<StringBuilder>(); }
+    [[nodiscard]] String to_string() const { return serialized<StringBuilder>(); }
 
     template<typename Callback>
     void for_each(Callback callback) const
@@ -73,7 +73,7 @@ public:
             callback(value);
     }
 
-    Vector<JsonValue> const& values() const { return m_values; }
+    [[nodiscard]] Vector<JsonValue> const& values() const { return m_values; }
 
     void ensure_capacity(size_t capacity) { m_values.ensure_capacity(capacity); }
 
diff --git a/AK/JsonObject.h b/AK/JsonObject.h
index 0be008b00a..6e5b2e9a9f 100644
--- a/AK/JsonObject.h
+++ b/AK/JsonObject.h
@@ -44,10 +44,10 @@ public:
         return *this;
     }
 
-    size_t size() const { return m_members.size(); }
-    bool is_empty() const { return m_members.is_empty(); }
+    [[nodiscard]] size_t size() const { return m_members.size(); }
+    [[nodiscard]] bool is_empty() const { return m_members.is_empty(); }
 
-    JsonValue const& get(String const& key) const
+    [[nodiscard]] JsonValue const& get(String const& key) const
     {
         auto* value = get_ptr(key);
         static JsonValue* s_null_value { nullptr };
@@ -59,7 +59,7 @@ public:
         return *value;
     }
 
-    JsonValue const* get_ptr(String const& key) const
+    [[nodiscard]] JsonValue const* get_ptr(String const& key) const
     {
         auto it = m_members.find(key);
         if (it == m_members.end())
@@ -67,63 +67,63 @@ public:
         return &(*it).value;
     }
 
-    bool has(String const& key) const
+    [[nodiscard]] [[nodiscard]] bool has(String const& key) const
     {
         return m_members.contains(key);
     }
 
-    bool has_null(String const& key) const
+    [[nodiscard]] bool has_null(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_null();
     }
-    bool has_bool(String const& key) const
+    [[nodiscard]] bool has_bool(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_bool();
     }
-    bool has_string(String const& key) const
+    [[nodiscard]] bool has_string(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_string();
     }
-    bool has_i32(String const& key) const
+    [[nodiscard]] bool has_i32(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_i32();
     }
-    bool has_u32(String const& key) const
+    [[nodiscard]] bool has_u32(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_u32();
     }
-    bool has_i64(String const& key) const
+    [[nodiscard]] bool has_i64(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_i64();
     }
-    bool has_u64(String const& key) const
+    [[nodiscard]] bool has_u64(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_u64();
     }
-    bool has_number(String const& key) const
+    [[nodiscard]] bool has_number(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_number();
     }
-    bool has_array(String const& key) const
+    [[nodiscard]] bool has_array(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_array();
     }
-    bool has_object(String const& key) const
+    [[nodiscard]] bool has_object(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_object();
     }
 #ifndef KERNEL
-    bool has_double(String const& key) const
+    [[nodiscard]] [[nodiscard]] bool has_double(String const& key) const
     {
         auto* value = get_ptr(key);
         return value && value->is_double();
@@ -153,7 +153,7 @@ public:
     template<typename Builder>
     void serialize(Builder&) const;
 
-    String to_string() const { return serialized<StringBuilder>(); }
+    [[nodiscard]] String to_string() const { return serialized<StringBuilder>(); }
 
 private:
     OrderedHashMap<String, JsonValue> m_members;