diff --git a/include/nodejs/json_v8_renderer.hpp b/include/nodejs/json_v8_renderer.hpp
index 9572744c2..a6b424da6 100644
--- a/include/nodejs/json_v8_renderer.hpp
+++ b/include/nodejs/json_v8_renderer.hpp
@@ -30,7 +30,7 @@ struct V8Renderer
         {
             Napi::Value child;
             std::visit(V8Renderer(env, child), keyValue.second);
-            obj.Set(keyValue.first, child);
+            obj.Set(keyValue.first.data(), child);
         }
         out = obj;
     }
diff --git a/include/util/json_container.hpp b/include/util/json_container.hpp
index 14ca9d52f..728b6e3e9 100644
--- a/include/util/json_container.hpp
+++ b/include/util/json_container.hpp
@@ -104,7 +104,7 @@ using Value = std::variant<String, Number, Object, Array, True, False, Null>;
  */
 struct Object
 {
-    std::unordered_map<std::string, Value> values;
+    std::unordered_map<std::string_view, Value> values;
 };
 
 /**
diff --git a/include/util/json_deep_compare.hpp b/include/util/json_deep_compare.hpp
index 24b226ca7..d57f9cde1 100644
--- a/include/util/json_deep_compare.hpp
+++ b/include/util/json_deep_compare.hpp
@@ -44,13 +44,13 @@ struct Comparator
 
     bool operator()(const Object &lhs, const Object &rhs) const
     {
-        std::set<std::string> lhs_keys;
+        std::set<std::string_view> lhs_keys;
         for (const auto &key_value : lhs.values)
         {
             lhs_keys.insert(key_value.first);
         }
 
-        std::set<std::string> rhs_keys;
+        std::set<std::string_view> rhs_keys;
         for (const auto &key_value : rhs.values)
         {
             rhs_keys.insert(key_value.first);
@@ -60,7 +60,7 @@ struct Comparator
         {
             if (rhs_keys.find(key) == rhs_keys.end())
             {
-                reason = rhs_path + " doesn't have key \"" + key + "\"";
+                reason = rhs_path + " doesn't have key \"" + std::string(key) + "\"";
                 return false;
             }
         }
@@ -69,7 +69,7 @@ struct Comparator
         {
             if (lhs_keys.find(key) == lhs_keys.end())
             {
-                reason = lhs_path + " doesn't have key \"" + key + "\"";
+                reason = lhs_path + " doesn't have key \"" + std::string(key) + "\"";
                 return false;
             }
         }
@@ -82,7 +82,7 @@ struct Comparator
             const auto &rhs_child = rhs.values.find(key)->second;
             const auto &lhs_child = lhs.values.find(key)->second;
             auto is_same =
-                std::visit(Comparator(reason, lhs_path + "." + key, rhs_path + "." + key),
+                std::visit(Comparator(reason, lhs_path + "." + std::string(key), rhs_path + "." + std::string(key)),
                            lhs_child,
                            rhs_child);
             if (!is_same)
diff --git a/include/util/json_renderer.hpp b/include/util/json_renderer.hpp
index d1adfcce6..bdc3dcae0 100644
--- a/include/util/json_renderer.hpp
+++ b/include/util/json_renderer.hpp
@@ -97,7 +97,7 @@ template <typename Out> struct Renderer
     void operator()(const Null &) { write<>("null"); }
 
   private:
-    void write(const std::string &str);
+    void write(std::string_view str);
     void write(const char *str, size_t size);
     void write(char ch);
 
@@ -110,7 +110,7 @@ template <typename Out> struct Renderer
     Out &out;
 };
 
-template <> void Renderer<std::vector<char>>::write(const std::string &str)
+template <> void Renderer<std::vector<char>>::write(std::string_view str)
 {
     out.insert(out.end(), str.begin(), str.end());
 }
@@ -122,7 +122,7 @@ template <> void Renderer<std::vector<char>>::write(const char *str, size_t size
 
 template <> void Renderer<std::vector<char>>::write(char ch) { out.push_back(ch); }
 
-template <> void Renderer<std::ostream>::write(const std::string &str) { out << str; }
+template <> void Renderer<std::ostream>::write(std::string_view str) { out << str; }
 
 template <> void Renderer<std::ostream>::write(const char *str, size_t size)
 {
@@ -131,7 +131,7 @@ template <> void Renderer<std::ostream>::write(const char *str, size_t size)
 
 template <> void Renderer<std::ostream>::write(char ch) { out << ch; }
 
-template <> void Renderer<std::string>::write(const std::string &str) { out += str; }
+template <> void Renderer<std::string>::write(std::string_view str) { out += str; }
 
 template <> void Renderer<std::string>::write(const char *str, size_t size)
 {