diff --git a/src/ConvertInputFormat/main.cpp b/src/ConvertInputFormat/main.cpp
index f8c37a45b44..ba9f38518f5 100644
--- a/src/ConvertInputFormat/main.cpp
+++ b/src/ConvertInputFormat/main.cpp
@@ -69,7 +69,7 @@
 #include <thread>
 #include <vector>
 
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 enum class OutputTypes
 {
@@ -294,7 +294,8 @@ bool processInput(fs::path const &inputFilePath,
                   OutputTypes outputType,
                   fs::path outputDirPath,
                   std::string &outputTypeStr,
-                  bool convertHVACTemplate)
+                  bool convertHVACTemplate,
+                  bool orderJSON)
 {
     auto validation(std::make_unique<Validation>(&schema));
     auto idf_parser(std::make_unique<IdfParser>());
@@ -502,6 +503,9 @@ Select one (case insensitive):
     bool noConvertHVACTemplate = false;
     app.add_flag("-n,--noHVACTemplate", noConvertHVACTemplate, "Do not convert HVACTemplate objects");
 
+    bool orderJSON = false;
+    app.add_flag("-k,--orderJSON", orderJSON, "Order epJSON objects");
+
     std::vector<fs::path> files;
     app.add_option("input_file", files, "Multiple input files to be translated")->required(false)->check(CLI::ExistingFile);
 
@@ -554,7 +558,7 @@ Select one (case insensitive):
     {
 #    pragma omp for
         for (int i = 0; i < number_files; ++i) {
-            const bool successful = processInput(files[i], schema, outputType, outputDirectoryPath, outputTypeStr, convertHVACTemplate);
+            const bool successful = processInput(files[i], schema, outputType, outputDirectoryPath, outputTypeStr, convertHVACTemplate, orderJSON);
 #    pragma omp atomic
             ++fileCount;
             if (successful) {
@@ -573,7 +577,7 @@ Select one (case insensitive):
     }
 
     for (auto const &file : files) {
-        bool successful = processInput(file, schema, outputType, outputDirectoryPath, outputTypeStr, convertHVACTemplate);
+        bool successful = processInput(file, schema, outputType, outputDirectoryPath, outputTypeStr, convertHVACTemplate, orderJSON);
         ++fileCount;
         if (successful) {
             displayMessage("Input file converted to {} successfully | {}/{} | {}", outputTypeStr, fileCount, number_files, file.generic_string());
diff --git a/src/EnergyPlus/FileSystem.cc b/src/EnergyPlus/FileSystem.cc
index 8b74c535a30..b25ee5e4bd2 100644
--- a/src/EnergyPlus/FileSystem.cc
+++ b/src/EnergyPlus/FileSystem.cc
@@ -366,7 +366,7 @@ namespace FileSystem {
         return result;
     }
 
-    nlohmann::json readJSON(fs::path const &filePath, std::ios_base::openmode mode)
+    nlohmann::ordered_json readJSON(fs::path const &filePath, std::ios_base::openmode mode)
     {
 
         // Shenanigans would not be needed with fmt 10+ (maybe earlier), because fmt has native fs::path support
@@ -389,15 +389,15 @@ namespace FileSystem {
         case FileTypes::EpJSON:
         case FileTypes::JSON:
         case FileTypes::GLHE:
-            return nlohmann::json::parse(file, nullptr, true, true);
+            return nlohmann::ordered_json::parse(file, nullptr, true, true);
         case FileTypes::CBOR:
-            return nlohmann::json::from_cbor(file);
+            return nlohmann::ordered_json::from_cbor(file);
         case FileTypes::MsgPack:
-            return nlohmann::json::from_msgpack(file);
+            return nlohmann::ordered_json::from_msgpack(file);
         case FileTypes::UBJSON:
-            return nlohmann::json::from_ubjson(file);
+            return nlohmann::ordered_json::from_ubjson(file);
         case FileTypes::BSON:
-            return nlohmann::json::from_bson(file);
+            return nlohmann::ordered_json::from_bson(file);
         default:
             throw FatalError("Invalid file extension. Must be epJSON, JSON, or other experimental extensions");
         }
diff --git a/src/EnergyPlus/FileSystem.hh b/src/EnergyPlus/FileSystem.hh
index edd806a8897..6d297b3afc6 100644
--- a/src/EnergyPlus/FileSystem.hh
+++ b/src/EnergyPlus/FileSystem.hh
@@ -192,22 +192,22 @@ namespace FileSystem {
     std::string readFile(fs::path const &filePath, std::ios_base::openmode mode = std::ios_base::in | std::ios_base::binary);
 
     // Reads the full json file if it exists
-    nlohmann::json readJSON(fs::path const &filePath, std::ios_base::openmode mode = std::ios_base::in | std::ios_base::binary);
+    nlohmann::ordered_json readJSON(fs::path const &filePath, std::ios_base::openmode mode = std::ios_base::in | std::ios_base::binary);
 
-    template <FileTypes fileType> std::string getJSON(const nlohmann::json &data, int const indent = 4)
+    template <FileTypes fileType> std::string getJSON(const nlohmann::ordered_json &data, int const indent = 4)
     {
         if constexpr (is_json_type(fileType)) {
-            return data.dump(indent, ' ', false, nlohmann::json::error_handler_t::replace);
+            return data.dump(indent, ' ', false, nlohmann::ordered_json::error_handler_t::replace);
         } else if constexpr (is_binary_json_type(fileType)) {
             std::string binary_data;
             if constexpr (fileType == FileTypes::CBOR) {
-                nlohmann::json::to_cbor(data, binary_data);
+                nlohmann::ordered_json::to_cbor(data, binary_data);
             } else if constexpr (fileType == FileTypes::MsgPack) {
-                nlohmann::json::to_msgpack(data, binary_data);
+                nlohmann::ordered_json::to_msgpack(data, binary_data);
             } else if constexpr (fileType == FileTypes::BSON) {
-                nlohmann::json::to_bson(data, binary_data);
+                nlohmann::ordered_json::to_bson(data, binary_data);
             } else if constexpr (fileType == FileTypes::UBJSON) {
-                nlohmann::json::to_ubjson(data, binary_data);
+                nlohmann::ordered_json::to_ubjson(data, binary_data);
             }
             return binary_data;
         } else {
@@ -225,7 +225,7 @@ namespace FileSystem {
 
     template <class T, FileTypes fileType>
     inline constexpr bool enable_json_v =
-        is_all_json_type(fileType) && is_any<T, nlohmann::json>::value && !is_any<T, std::string_view, std::string, char *>::value;
+        is_all_json_type(fileType) && is_any<T, nlohmann::ordered_json>::value && !is_any<T, std::string_view, std::string, char *>::value;
 
     template <FileTypes fileType> void writeFile(fs::path const &filePath, const std::string_view data)
     {
diff --git a/src/EnergyPlus/InputProcessing/IdfParser.cc b/src/EnergyPlus/InputProcessing/IdfParser.cc
index fa3e989f094..81e382de951 100644
--- a/src/EnergyPlus/InputProcessing/IdfParser.cc
+++ b/src/EnergyPlus/InputProcessing/IdfParser.cc
@@ -53,7 +53,7 @@
 #include <milo/dtoa.h>
 #include <milo/itoa.h>
 
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 auto const icompare = [](std::string_view a, std::string_view b) { // (AUTO_OK)
     return (a.length() == b.length()
diff --git a/src/EnergyPlus/InputProcessing/IdfParser.hh b/src/EnergyPlus/InputProcessing/IdfParser.hh
index 5a6024983a7..7b0c84eccf4 100644
--- a/src/EnergyPlus/InputProcessing/IdfParser.hh
+++ b/src/EnergyPlus/InputProcessing/IdfParser.hh
@@ -61,7 +61,7 @@ class IdfParser
 {
 public:
     friend class EnergyPlus::InputProcessorFixture;
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     IdfParser() = default;
 
diff --git a/src/EnergyPlus/InputProcessing/InputProcessor.cc b/src/EnergyPlus/InputProcessing/InputProcessor.cc
index 399de684216..7186416877f 100644
--- a/src/EnergyPlus/InputProcessing/InputProcessor.cc
+++ b/src/EnergyPlus/InputProcessing/InputProcessor.cc
@@ -102,7 +102,7 @@ namespace EnergyPlus {
 
 static std::string const BlankString;
 
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 const json &InputProcessor::schema()
 {
diff --git a/src/EnergyPlus/InputProcessing/InputProcessor.hh b/src/EnergyPlus/InputProcessing/InputProcessor.hh
index ebabb297d6c..30cfd2b99dd 100644
--- a/src/EnergyPlus/InputProcessing/InputProcessor.hh
+++ b/src/EnergyPlus/InputProcessing/InputProcessor.hh
@@ -76,12 +76,12 @@ struct EnergyPlusData;
 
 namespace EnergyPlus {
 
-void cleanEPJSON(nlohmann::json &epjson);
+void cleanEPJSON(nlohmann::ordered_json &epjson);
 
 class InputProcessor
 {
 public:
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     json::parser_callback_t callback;
 
diff --git a/src/EnergyPlus/InputProcessing/InputValidation.cc b/src/EnergyPlus/InputProcessing/InputValidation.cc
index d41e85346b1..8feb5b25e03 100644
--- a/src/EnergyPlus/InputProcessing/InputValidation.cc
+++ b/src/EnergyPlus/InputProcessing/InputValidation.cc
@@ -57,7 +57,7 @@
 #include <valijson/utils/nlohmann_json_utils.hpp>
 #include <valijson/validator.hpp>
 
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 Validation::Validation(json const *parsed_schema)
 {
diff --git a/src/EnergyPlus/InputProcessing/InputValidation.hh b/src/EnergyPlus/InputProcessing/InputValidation.hh
index 92172a6a34b..2b9b0bbcd99 100644
--- a/src/EnergyPlus/InputProcessing/InputValidation.hh
+++ b/src/EnergyPlus/InputProcessing/InputValidation.hh
@@ -58,7 +58,7 @@
 class Validation
 {
 public:
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     explicit Validation(json const *parsed_schema);
 
diff --git a/src/EnergyPlus/ResultsFramework.hh b/src/EnergyPlus/ResultsFramework.hh
index 8b8a1a8ef19..3dc90704ae8 100644
--- a/src/EnergyPlus/ResultsFramework.hh
+++ b/src/EnergyPlus/ResultsFramework.hh
@@ -73,7 +73,7 @@ struct JsonOutputFilePaths;
 
 namespace ResultsFramework {
 
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     using OutputProcessor::ReportFreq;
     using OutputProcessor::TimeStepType;
diff --git a/tst/EnergyPlus/unit/Fixtures/EnergyPlusFixture.cc b/tst/EnergyPlus/unit/Fixtures/EnergyPlusFixture.cc
index 714aba13047..ba89681148e 100644
--- a/tst/EnergyPlus/unit/Fixtures/EnergyPlusFixture.cc
+++ b/tst/EnergyPlus/unit/Fixtures/EnergyPlusFixture.cc
@@ -70,7 +70,7 @@
 #include <nlohmann/json.hpp>
 #include <regex>
 
-using json = nlohmann::json;
+using json = nlohmann::ordered_json;
 
 namespace EnergyPlus {
 
diff --git a/tst/EnergyPlus/unit/Fixtures/InputProcessorFixture.hh b/tst/EnergyPlus/unit/Fixtures/InputProcessorFixture.hh
index ea1591d6d3d..a9e5c0efbf4 100644
--- a/tst/EnergyPlus/unit/Fixtures/InputProcessorFixture.hh
+++ b/tst/EnergyPlus/unit/Fixtures/InputProcessorFixture.hh
@@ -62,7 +62,7 @@ namespace EnergyPlus {
 class InputProcessorFixture : public EnergyPlusFixture
 {
 protected:
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     //    static void SetUpTestCase()
     //    {
diff --git a/tst/EnergyPlus/unit/Fixtures/ResultsFrameworkFixture.hh b/tst/EnergyPlus/unit/Fixtures/ResultsFrameworkFixture.hh
index e4613567808..3ebba4ead52 100644
--- a/tst/EnergyPlus/unit/Fixtures/ResultsFrameworkFixture.hh
+++ b/tst/EnergyPlus/unit/Fixtures/ResultsFrameworkFixture.hh
@@ -60,7 +60,7 @@ namespace EnergyPlus {
 class ResultsFrameworkFixture : public EnergyPlusFixture
 {
 protected:
-    using json = nlohmann::json;
+    using json = nlohmann::ordered_json;
 
     //    static void SetUpTestCase()
     //    {