diff --git a/CMakeLists.txt b/CMakeLists.txt
index 849366d9..7673e63a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -236,8 +236,8 @@ if (ANDROID)
 endif()
 
 set(MAT_JSON_AS_INTERFACE ON)
-CPMAddPackage("gh:geode-sdk/json#1b182dd")
 CPMAddPackage("gh:geode-sdk/result@1.1.0")
+CPMAddPackage("gh:geode-sdk/json#8c6c325")
 CPMAddPackage("gh:fmtlib/fmt#10.2.1")
 
 target_compile_definitions(${PROJECT_NAME} INTERFACE MAT_JSON_DYNAMIC=1)
diff --git a/loader/include/Geode/cocos/base_nodes/CCNode.h b/loader/include/Geode/cocos/base_nodes/CCNode.h
index bf4f00c9..1bbf681c 100644
--- a/loader/include/Geode/cocos/base_nodes/CCNode.h
+++ b/loader/include/Geode/cocos/base_nodes/CCNode.h
@@ -41,7 +41,7 @@
 #include <Geode/utils/casts.hpp>
 
 #ifndef GEODE_IS_MEMBER_TEST
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #endif
 
 namespace geode {
diff --git a/loader/include/Geode/loader/Hook.hpp b/loader/include/Geode/loader/Hook.hpp
index 1ea4d792..6a3eb105 100644
--- a/loader/include/Geode/loader/Hook.hpp
+++ b/loader/include/Geode/loader/Hook.hpp
@@ -2,7 +2,7 @@
 
 #include "../DefaultInclude.hpp"
 #include "../utils/general.hpp"
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include "Tulip.hpp"
 #include <cinttypes>
 #include <string_view>
diff --git a/loader/include/Geode/loader/IPC.hpp b/loader/include/Geode/loader/IPC.hpp
index 015b246f..73e32d1e 100644
--- a/loader/include/Geode/loader/IPC.hpp
+++ b/loader/include/Geode/loader/IPC.hpp
@@ -3,7 +3,7 @@
 #include "Event.hpp"
 #include "Loader.hpp"
 #include "Mod.hpp"
-#include <matjson3.hpp>
+#include <matjson.hpp>
 
 namespace geode::ipc {
     #ifdef GEODE_IS_WINDOWS
diff --git a/loader/include/Geode/loader/Loader.hpp b/loader/include/Geode/loader/Loader.hpp
index 41ef428a..62c9f70b 100644
--- a/loader/include/Geode/loader/Loader.hpp
+++ b/loader/include/Geode/loader/Loader.hpp
@@ -8,7 +8,7 @@
 #include "Types.hpp"
 
 #include <atomic>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <mutex>
 #include <optional>
 #include <string_view>
diff --git a/loader/include/Geode/loader/Log.hpp b/loader/include/Geode/loader/Log.hpp
index 88ad3cb5..563776ec 100644
--- a/loader/include/Geode/loader/Log.hpp
+++ b/loader/include/Geode/loader/Log.hpp
@@ -7,7 +7,7 @@
 #include <ccTypes.h>
 #include <chrono>
 #include <filesystem>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <type_traits>
 #include <fmt/core.h>
 // for formatting std::vector and such
diff --git a/loader/include/Geode/loader/Mod.hpp b/loader/include/Geode/loader/Mod.hpp
index ecec1005..aff3aa8a 100644
--- a/loader/include/Geode/loader/Mod.hpp
+++ b/loader/include/Geode/loader/Mod.hpp
@@ -13,7 +13,7 @@
 #include "Types.hpp"
 #include "Loader.hpp"
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <matjson/stl_serialize.hpp>
 #include <optional>
 #include <string_view>
diff --git a/loader/include/Geode/loader/ModMetadata.hpp b/loader/include/Geode/loader/ModMetadata.hpp
index cf08961c..435c4fca 100644
--- a/loader/include/Geode/loader/ModMetadata.hpp
+++ b/loader/include/Geode/loader/ModMetadata.hpp
@@ -4,7 +4,7 @@
 #include "../utils/VersionInfo.hpp"
 #include "Types.hpp"
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <memory>
 
 namespace geode {
diff --git a/loader/include/Geode/loader/Types.hpp b/loader/include/Geode/loader/Types.hpp
index 5f887925..e5243a47 100644
--- a/loader/include/Geode/loader/Types.hpp
+++ b/loader/include/Geode/loader/Types.hpp
@@ -2,7 +2,7 @@
 
 #include "../DefaultInclude.hpp"
 #include "../platform/cplatform.h"
-#include <matjson3.hpp>
+#include <matjson.hpp>
 
 #include <string>
 
diff --git a/loader/include/Geode/utils/JsonValidation.hpp b/loader/include/Geode/utils/JsonValidation.hpp
index 1776614f..b2522a83 100644
--- a/loader/include/Geode/utils/JsonValidation.hpp
+++ b/loader/include/Geode/utils/JsonValidation.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include "../loader/Log.hpp"
 #include <set>
 #include <variant>
@@ -223,6 +223,13 @@ namespace geode {
          * @returns The key, which is a no-op value if it didn't exist
          */
         JsonExpectedValue has(std::string_view key);
+        /**
+         * Check if this object has an optional key. Asserts that this JSON 
+         * value is an object. If the key doesn't exist, or the value is null, returns a 
+         * `JsonExpectValue` that does nothing
+         * @returns The key, which is a no-op value if it didn't exist, or was null
+         */
+        JsonExpectedValue hasNullable(std::string_view key);
         /**
          * Check if this object has an optional key. Asserts that this JSON 
          * value is an object. If the key doesn't exist, sets an error and 
diff --git a/loader/include/Geode/utils/VersionInfo.hpp b/loader/include/Geode/utils/VersionInfo.hpp
index ad19692f..ed51ada9 100644
--- a/loader/include/Geode/utils/VersionInfo.hpp
+++ b/loader/include/Geode/utils/VersionInfo.hpp
@@ -2,7 +2,7 @@
 
 #include "../DefaultInclude.hpp"
 #include <string_view>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <tuple>
 #include <Geode/Result.hpp>
 
@@ -258,9 +258,9 @@ requires std::is_same_v<V, geode::VersionInfo> || std::is_same_v<V, geode::Compa
 struct matjson::Serialize<V> {
     static geode::Result<V, std::string> fromJson(Value const& value)
     {
-        auto str = GEODE_UNWRAP(value.asString());
-        auto version = GEODE_UNWRAP(V::parse(str).mapErr([](auto&& err) {
-            return geode::Err("Invalid version format: {}", err);
+        GEODE_UNWRAP_INTO(auto str, value.asString());
+        GEODE_UNWRAP_INTO(auto version, V::parse(str).mapErr([](auto&& err) {
+            return fmt::format("Invalid version format: {}", err);
         }));
         return geode::Ok(version);
     }
diff --git a/loader/include/Geode/utils/cocos.hpp b/loader/include/Geode/utils/cocos.hpp
index b72c096d..e2337aef 100644
--- a/loader/include/Geode/utils/cocos.hpp
+++ b/loader/include/Geode/utils/cocos.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include "casts.hpp"
 #include "general.hpp"
 #include "../DefaultInclude.hpp"
diff --git a/loader/include/Geode/utils/file.hpp b/loader/include/Geode/utils/file.hpp
index 2ff28895..3cc7f7c5 100644
--- a/loader/include/Geode/utils/file.hpp
+++ b/loader/include/Geode/utils/file.hpp
@@ -5,7 +5,7 @@
 #include "../loader/Event.hpp"
 #include "Task.hpp"
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <Geode/DefaultInclude.hpp>
 #include <filesystem>
 #include <string>
@@ -15,7 +15,7 @@ template <>
 struct matjson::Serialize<std::filesystem::path> {
     static geode::Result<std::filesystem::path, std::string> fromJson(Value const& value)
     {
-        auto str = GEODE_UNWRAP(value.asString());
+        GEODE_UNWRAP_INTO(auto str, value.asString());
         return geode::Ok(std::filesystem::path(str).make_preferred());
     }
 
diff --git a/loader/include/Geode/utils/general.hpp b/loader/include/Geode/utils/general.hpp
index 4cca1163..78298810 100644
--- a/loader/include/Geode/utils/general.hpp
+++ b/loader/include/Geode/utils/general.hpp
@@ -9,7 +9,7 @@
 #include <string>
 #include <vector>
 #include <filesystem>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <charconv>
 #include <clocale>
 #include <type_traits>
@@ -170,9 +170,8 @@ namespace geode {
 
 template<>
 struct matjson::Serialize<geode::ByteVector> {
-    static Value toJson(geode::ByteVector const& bytes)
-    {
-        return matjson::Array(bytes.begin(), bytes.end());
+    static Value toJson(geode::ByteVector const& bytes) {
+        return std::vector<matjson::Value>(bytes.begin(), bytes.end());
     }
 };
 
diff --git a/loader/include/Geode/utils/web.hpp b/loader/include/Geode/utils/web.hpp
index 5f01a89b..ad06e247 100644
--- a/loader/include/Geode/utils/web.hpp
+++ b/loader/include/Geode/utils/web.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <Geode/loader/Loader.hpp> // another great circular dependency fix
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <Geode/Result.hpp>
 #include "Task.hpp"
 #include <chrono>
diff --git a/loader/src/loader/HookImpl.cpp b/loader/src/loader/HookImpl.cpp
index 558a1756..e10adc70 100644
--- a/loader/src/loader/HookImpl.cpp
+++ b/loader/src/loader/HookImpl.cpp
@@ -98,7 +98,7 @@ std::string_view Hook::Impl::getDisplayName() const {
 }
 
 matjson::Value Hook::Impl::getRuntimeInfo() const {
-    auto json = matjson::Object();
+    matjson::Value json;
     json["address"] = std::to_string(reinterpret_cast<uintptr_t>(m_address));
     json["detour"] = std::to_string(reinterpret_cast<uintptr_t>(m_detour));
     json["name"] = m_displayName;
diff --git a/loader/src/loader/IPC.cpp b/loader/src/loader/IPC.cpp
index 427efef1..30d54d3e 100644
--- a/loader/src/loader/IPC.cpp
+++ b/loader/src/loader/IPC.cpp
@@ -1,6 +1,6 @@
 #include <Geode/loader/IPC.hpp>
 #include "IPC.hpp"
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <Geode/loader/Mod.hpp>
 
 using namespace geode::prelude;
@@ -34,7 +34,7 @@ matjson::Value ipc::processRaw(void* rawHandle, std::string const& buffer) {
     matjson::Value reply;
 
     auto res = matjson::Value::parse(buffer);
-    if (error.size() > 0) {
+    if (!res) {
         log::warn("Received IPC message that isn't valid JSON: {}", res.unwrapErr());
         return reply;
     }
diff --git a/loader/src/loader/IPC.hpp b/loader/src/loader/IPC.hpp
index 7ea91ff5..35fbc81f 100644
--- a/loader/src/loader/IPC.hpp
+++ b/loader/src/loader/IPC.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <string>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 
 namespace geode::ipc {
     void setup();
diff --git a/loader/src/loader/LoaderImpl.hpp b/loader/src/loader/LoaderImpl.hpp
index 3a340720..7af233d5 100644
--- a/loader/src/loader/LoaderImpl.hpp
+++ b/loader/src/loader/LoaderImpl.hpp
@@ -2,7 +2,7 @@
 
 #include "FileWatcher.hpp"
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <Geode/loader/Dirs.hpp>
 #include <Geode/loader/Loader.hpp>
 #include <Geode/loader/Log.hpp>
diff --git a/loader/src/loader/ModImpl.cpp b/loader/src/loader/ModImpl.cpp
index ef237fe7..cc345252 100644
--- a/loader/src/loader/ModImpl.cpp
+++ b/loader/src/loader/ModImpl.cpp
@@ -190,15 +190,12 @@ Result<> Mod::Impl::loadData() {
     auto savedPath = m_saveDirPath / "saved.json";
     if (std::filesystem::exists(savedPath)) {
         GEODE_UNWRAP_INTO(auto data, utils::file::readString(savedPath));
-        std::string error;
-        auto res = matjson::parse(data, error);
-        if (error.size() > 0) {
-            return Err("Unable to parse saved values: " + error);
-        }
-        m_saved = res.value();
-        if (!m_saved.is_object()) {
+        m_saved = GEODE_UNWRAP(matjson::parse(data).mapErr([](auto&& err) {
+            return fmt::format("Unable to parse saved values: {}", err);
+        }));
+        if (!m_saved.isObject()) {
             log::warn("saved.json was somehow not an object, forcing it to one");
-            m_saved = matjson::Object();
+            m_saved = matjson::Value::object();
         }
     }
 
@@ -218,11 +215,15 @@ Result<> Mod::Impl::saveData() {
     // saveData is expected to be synchronous, and always called from GD thread
     ModStateEvent(m_self, ModEventType::DataSaved).post();
 
-    auto res = utils::file::writeString(m_saveDirPath / "settings.json", json.dump());
+    auto res = json.dump().andThen([&](auto const& str) {
+        return utils::file::writeString(m_saveDirPath / "settings.json", str);
+    });
     if (!res) {
         log::error("Unable to save settings: {}", res.unwrapErr());
     }
-    auto res2 = utils::file::writeString(m_saveDirPath / "saved.json", m_saved.dump());
+    auto res2 = m_saved.dump().andThen([&](auto const& str) {
+        return utils::file::writeString(m_saveDirPath / "saved.json", str);
+    });
     if (!res2) {
         log::error("Unable to save values: {}", res2.unwrapErr());
     }
@@ -387,7 +388,7 @@ Result<> Mod::Impl::uninstall(bool deleteSaveData) {
         ModRequestedAction::Uninstall;
 
     // Make loader forget the mod should be disabled
-    Mod::get()->getSaveContainer().try_erase("should-load-" + m_metadata.getID());
+    Mod::get()->getSaveContainer().erase("should-load-" + m_metadata.getID());
 
     std::error_code ec;
     std::filesystem::remove(m_metadata.getPath(), ec);
@@ -674,14 +675,14 @@ std::string_view Mod::Impl::expandSpriteName(std::string_view name) {
 ModJson Mod::Impl::getRuntimeInfo() const {
     auto json = m_metadata.toJSON();
 
-    auto obj = matjson::Object();
-    obj["hooks"] = matjson::Array();
+    auto obj = matjson::Value::object();
+    obj["hooks"] = matjson::Value::array();
     for (auto hook : m_hooks) {
-        obj["hooks"].as_array().push_back(ModJson(hook->getRuntimeInfo()));
+        obj["hooks"].push(ModJson(hook->getRuntimeInfo()));
     }
-    obj["patches"] = matjson::Array();
+    obj["patches"] = matjson::Value::array();
     for (auto patch : m_patches) {
-        obj["patches"].as_array().push_back(ModJson(patch->getRuntimeInfo()));
+        obj["patches"].push(ModJson(patch->getRuntimeInfo()));
     }
     obj["loaded"] = m_enabled;
     obj["temp-dir"] = this->getTempDir();
@@ -722,12 +723,9 @@ std::vector<LoadProblem> Mod::Impl::getProblems() const {
 }
 
 static Result<ModMetadata> getModImplInfo() {
-    std::string error;
-    auto res = matjson::parse(about::getLoaderModJson(), error);
-    if (error.size() > 0) {
-        return Err("Unable to parse mod.json: " + error);
-    }
-    matjson::Value json = res.value();
+    auto json = GEODE_UNWRAP(matjson::parse(about::getLoaderModJson()).mapErr([](auto&& err) {
+        return fmt::format("Unable to parse mod.json: {}", err);
+    }));
 
     GEODE_UNWRAP_INTO(auto info, ModMetadata::create(json));
     return Ok(info);
diff --git a/loader/src/loader/ModImpl.hpp b/loader/src/loader/ModImpl.hpp
index 5c64be24..436dece4 100644
--- a/loader/src/loader/ModImpl.hpp
+++ b/loader/src/loader/ModImpl.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include "ModPatch.hpp"
 #include <Geode/loader/Loader.hpp>
 #include <string_view>
diff --git a/loader/src/loader/ModMetadataImpl.cpp b/loader/src/loader/ModMetadataImpl.cpp
index 6dd60bf2..8c048b8d 100644
--- a/loader/src/loader/ModMetadataImpl.cpp
+++ b/loader/src/loader/ModMetadataImpl.cpp
@@ -5,7 +5,7 @@
 #include <Geode/utils/string.hpp>
 #include <Geode/utils/general.hpp>
 #include <about.hpp>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <utility>
 #include <clocale>
 
@@ -113,14 +113,14 @@ Result<ModMetadata> ModMetadata::Impl::createFromSchemaV010(ModJson const& rawJs
 
     auto checkerRoot = fmt::format(
         "[{}/v0.0.0/mod.json]",
-        rawJson.contains("id") ? rawJson["id"].as_string() : "unknown.mod"
+        rawJson.contains("id") ? GEODE_UNWRAP(rawJson["id"].asString()) : "unknown.mod"
     );
     // JsonChecker did it this way too
     try {
         checkerRoot = fmt::format(
             "[{}/{}/mod.json]",
-            rawJson.contains("id") ? rawJson["id"].as_string() : "unknown.mod",
-            rawJson.contains("version") ? rawJson["version"].as<VersionInfo>().toVString() : "v0.0.0"
+            rawJson.contains("id") ? GEODE_UNWRAP(rawJson["id"].asString()) : "unknown.mod",
+            rawJson.contains("version") ? GEODE_UNWRAP(rawJson["version"].as<VersionInfo>()).toVString() : "v0.0.0"
         );
     }
     catch (...) { }
@@ -304,10 +304,10 @@ Result<ModMetadata> ModMetadata::Impl::createFromSchemaV010(ModJson const& rawJs
 Result<ModMetadata> ModMetadata::Impl::create(ModJson const& json) {
     // Check mod.json target version
     auto schema = about::getLoaderVersion();
-    if (json.contains("geode") && json["geode"].is_string()) {
+    if (json.contains("geode") && json["geode"].isString()) {
         GEODE_UNWRAP_INTO(
             schema,
-            VersionInfo::parse(json["geode"].as_string()).mapErr(
+            VersionInfo::parse(GEODE_UNWRAP(json["geode"].asString())).mapErr(
                 [](auto const& err) {
                     return fmt::format("[mod.json] has invalid target loader version: {}", err);
                 }
@@ -355,13 +355,9 @@ Result<ModMetadata> ModMetadata::Impl::create(ModJson const& json) {
 Result<ModMetadata> ModMetadata::Impl::createFromFile(std::filesystem::path const& path) {
     GEODE_UNWRAP_INTO(auto read, utils::file::readString(path));
 
-    std::string error;
-    auto res = matjson::parse(read, error);
-    if (error.size() > 0) {
-        return Err(std::string("Unable to parse mod.json: ") + error);
-    }
-
-    GEODE_UNWRAP_INTO(auto info, ModMetadata::create(res.value()));
+    GEODE_UNWRAP_INTO(auto info, ModMetadata::create(GEODE_UNWRAP(matjson::parse(read).mapErr([&](auto const& err) {
+        return fmt::format("Unable to parse mod.json: {}", err);
+    }))));
 
     auto impl = info.m_impl.get();
 
@@ -390,18 +386,13 @@ Result<ModMetadata> ModMetadata::Impl::createFromGeodeZip(file::Unzip& unzip) {
         })
     );
 
-    std::string error;
-    auto res = matjson::parse(std::string(jsonData.begin(), jsonData.end()), error);
-    if (error.size() > 0) {
-        return Err(std::string("Unable to parse mod.json: ") + error);
-    }
-    ModJson json = res.value();
+    ModJson json = GEODE_UNWRAP(matjson::parse(std::string(jsonData.begin(), jsonData.end())).mapErr([](auto const& err) {
+        return fmt::format("Unable to parse mod.json: {}", err);
+    }));
 
-    auto res2 = ModMetadata::create(json);
-    if (!res2) {
-        return Err("\"" + unzip.getPath().string() + "\" - " + res2.unwrapErr());
-    }
-    auto info = res2.unwrap();
+    auto info = GEODE_UNWRAP(ModMetadata::create(json).mapErr([&](auto const& err) {
+        return fmt::format("\"{}\" - {}", unzip.getPath().string(), err);
+    }));
     auto impl = info.m_impl.get();
     impl->m_path = unzip.getPath();
 
diff --git a/loader/src/loader/ModSettingsManager.cpp b/loader/src/loader/ModSettingsManager.cpp
index 494a26da..1ab4fb9e 100644
--- a/loader/src/loader/ModSettingsManager.cpp
+++ b/loader/src/loader/ModSettingsManager.cpp
@@ -124,16 +124,11 @@ public:
             // Store the value in an intermediary so if `save` fails the existing 
             // value loaded from disk isn't overwritten
             matjson::Value value;
-            try {
-                if (sett.v3->save(value)) {
-                    this->savedata[key] = value;
-                }
-                else {
-                    log::error("Unable to save setting '{}' for mod {}", key, this->modID);
-                }
+            if (sett.v3->save(value)) {
+                this->savedata[key] = value;
             }
-            catch(matjson::JsonException const& e) {
-                log::error("Unable to save setting '{}' for mod {} (JSON exception): {}", key, this->modID, e.what());
+            else {
+                log::error("Unable to save setting '{}' for mod {}", key, this->modID);
             }
         }
     }
@@ -209,11 +204,11 @@ Result<> ModSettingsManager::registerCustomSettingType(std::string_view type, Se
 }
 
 Result<> ModSettingsManager::load(matjson::Value const& json) {
-    if (json.is_object()) {
+    if (json.isObject()) {
         // Save this so when custom settings are registered they can load their 
         // values properly
-        m_impl->savedata = json.as_object();
-        for (auto const& [key, _] : json.as_object()) {
+        m_impl->savedata = json;
+        for (auto const& [key, _] : json) {
            m_impl->loadSettingValueFromSave(key);
         }
     }
diff --git a/loader/src/loader/PatchImpl.cpp b/loader/src/loader/PatchImpl.cpp
index 4f30a73e..c483613f 100644
--- a/loader/src/loader/PatchImpl.cpp
+++ b/loader/src/loader/PatchImpl.cpp
@@ -104,7 +104,7 @@ uintptr_t Patch::Impl::getAddress() const {
 }
 
 matjson::Value Patch::Impl::getRuntimeInfo() const {
-    auto json = matjson::Object();
+    auto json = matjson::Value::object();
     json["address"] = std::to_string(reinterpret_cast<uintptr_t>(m_address));
     json["original"] = m_original;
     json["patch"] = m_patch;
diff --git a/loader/src/loader/updater.hpp b/loader/src/loader/updater.hpp
index 07a96b7f..31641b93 100644
--- a/loader/src/loader/updater.hpp
+++ b/loader/src/loader/updater.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <string>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <Geode/loader/Event.hpp>
 
 namespace geode::updater {
diff --git a/loader/src/platform/windows/IPC.cpp b/loader/src/platform/windows/IPC.cpp
index 7c2a1514..42ad4cb7 100644
--- a/loader/src/platform/windows/IPC.cpp
+++ b/loader/src/platform/windows/IPC.cpp
@@ -21,7 +21,11 @@ void ipcPipeThread(HANDLE pipe) {
     if (ReadFile(pipe, buffer, sizeof(buffer) - 1, &read, nullptr)) {
         buffer[read] = '\0';
 
-        std::string reply = ipc::processRaw((void*)pipe, buffer).dump();
+        auto res = ipc::processRaw((void*)pipe, buffer).dump();
+        if (!res) {
+            log::warn("Failed to process IPC message: {}", res.unwrapErr());
+        }
+        std::string reply = res.unwrapOr("");
 
         DWORD written;
         WriteFile(pipe, reply.c_str(), reply.size(), &written, nullptr);
diff --git a/loader/src/server/Server.cpp b/loader/src/server/Server.cpp
index ed53871f..49867ffd 100644
--- a/loader/src/server/Server.cpp
+++ b/loader/src/server/Server.cpp
@@ -172,24 +172,23 @@ static Result<matjson::Value, ServerError> parseServerPayload(web::WebResponse c
         return Err(ServerError(response.code(), "Response was not valid JSON: {}", asJson.unwrapErr()));
     }
     auto json = std::move(asJson).unwrap();
-    if (!json.is_object()) {
+    if (!json.isObject()) {
         return Err(ServerError(response.code(), "Expected object, got {}", jsonTypeToString(json.type())));
     }
-    auto obj = json.as_object();
-    if (!obj.contains("payload")) {
-        return Err(ServerError(response.code(), "Object does not contain \"payload\" key - got {}", json.dump()));
+    if (!json.contains("payload")) {
+        return Err(ServerError(response.code(), "Object does not contain \"payload\" key - got {}", json.dump().unwrapOr("?")));
     }
-    return Ok(obj["payload"]);
+    return Ok(json["payload"]);
 }
 
 static ServerError parseServerError(web::WebResponse const& error) {
     // The server should return errors as `{ "error": "...", "payload": "" }`
     if (auto asJson = error.json()) {
         auto json = asJson.unwrap();
-        if (json.is_object() && json.contains("error")) {
+        if (json.isObject() && json.contains("error") && json["error"].isString()) {
             return ServerError(
                 error.code(),
-                "{}", json.get<std::string>("error")
+                "{}", json["error"].asString().unwrapOr("Unknown (no error message)")
             );
         }
         else {
@@ -267,8 +266,8 @@ Result<ServerModVersion> ServerModVersion::parse(matjson::Value const& raw) {
     // Verify target GD version
     auto gd_obj = root.needs("gd");
     std::string gd = "0.000";
-    if (gd_obj.has(GEODE_PLATFORM_SHORT_IDENTIFIER)) {
-        gd = gd_obj.has(GEODE_PLATFORM_SHORT_IDENTIFIER). get<std::string>();
+    if (gd_obj.hasNullable(GEODE_PLATFORM_SHORT_IDENTIFIER)) {
+        gd = gd_obj.hasNullable(GEODE_PLATFORM_SHORT_IDENTIFIER). get<std::string>();
     }
 
     if (gd != "*") {
@@ -288,11 +287,11 @@ Result<ServerModVersion> ServerModVersion::parse(matjson::Value const& raw) {
     res.metadata.setIsAPI(root.needs("api").get<bool>());
 
     std::vector<ModMetadata::Dependency> dependencies {};
-    for (auto& obj : root.has("dependencies").items()) {
+    for (auto& obj : root.hasNullable("dependencies").items()) {
         // todo: this should probably be generalized to use the same function as mod.json
 
-        bool onThisPlatform = !obj.has("platforms");
-        for (auto& plat : obj.has("platforms").items()) {
+        bool onThisPlatform = !obj.hasNullable("platforms");
+        for (auto& plat : obj.hasNullable("platforms").items()) {
             if (PlatformID::coveredBy(plat.get<std::string>(), GEODE_PLATFORM_TARGET)) {
                 onThisPlatform = true;
             }
@@ -304,7 +303,7 @@ Result<ServerModVersion> ServerModVersion::parse(matjson::Value const& raw) {
         ModMetadata::Dependency dependency;
         obj.needs("mod_id").mustBe<std::string>("a valid id", &ModMetadata::validateID).into(dependency.id);
         obj.needs("version").into(dependency.version);
-        obj.has("importance").into(dependency.importance);
+        obj.hasNullable("importance").into(dependency.importance);
 
         // Check if this dependency is installed, and if so assign the `mod` member to mark that
         auto mod = Loader::get()->getInstalledMod(dependency.id);
@@ -317,9 +316,9 @@ Result<ServerModVersion> ServerModVersion::parse(matjson::Value const& raw) {
     res.metadata.setDependencies(dependencies);
 
     std::vector<ModMetadata::Incompatibility> incompatibilities {};
-    for (auto& obj : root.has("incompatibilities").items()) {
+    for (auto& obj : root.hasNullable("incompatibilities").items()) {
         ModMetadata::Incompatibility incompatibility;
-        obj.has("importance").into(incompatibility.importance);
+        obj.hasNullable("importance").into(incompatibility.importance);
 
         auto modIdValue = obj.needs("mod_id");
 
@@ -362,8 +361,8 @@ Result<ServerModUpdate> ServerModUpdate::parse(matjson::Value const& raw) {
 
     root.needs("id").into(res.id);
     root.needs("version").into(res.version);
-    if (root.has("replacement")) {
-        GEODE_UNWRAP_INTO(res.replacement, ServerModReplacement::parse(root.has("replacement").json()));
+    if (root.hasNullable("replacement")) {
+        GEODE_UNWRAP_INTO(res.replacement, ServerModReplacement::parse(root.hasNullable("replacement").json()));
     }
 
     return root.ok(res);
@@ -400,9 +399,9 @@ Result<ServerModMetadata> ServerModMetadata::parse(matjson::Value const& raw) {
     root.needs("id").into(res.id);
     root.needs("featured").into(res.featured);
     root.needs("download_count").into(res.downloadCount);
-    root.has("about").into(res.about);
-    root.has("changelog").into(res.changelog);
-    root.has("repository").into(res.repository);
+    root.hasNullable("about").into(res.about);
+    root.hasNullable("changelog").into(res.changelog);
+    root.hasNullable("repository").into(res.repository);
     if (root.has("created_at")) {
         GEODE_UNWRAP_INTO(res.createdAt, ServerDateTime::parse(root.has("created_at").get<std::string>()));
     }
@@ -439,7 +438,7 @@ Result<ServerModMetadata> ServerModMetadata::parse(matjson::Value const& raw) {
         return Err("Mod '{}' has no (valid) versions", res.id);
     }
 
-    for (auto& item : root.has("tags").items()) {
+    for (auto& item : root.hasNullable("tags").items()) {
         res.tags.insert(item.get<std::string>());
     }
 
@@ -705,16 +704,16 @@ ServerRequest<std::unordered_set<std::string>> server::getTags(bool useCache) {
                     return Err(payload.unwrapErr());
                 }
                 matjson::Value json = payload.unwrap();
-                if (!json.is_array()) {
+                if (!json.isArray()) {
                     return Err(ServerError(response->code(), "Expected a string array"));
                 }
 
                 std::unordered_set<std::string> tags;
-                for (auto item : json.as_array()) {
-                    if (!item.is_string()) {
+                for (auto item : json) {
+                    if (!item.isString()) {
                         return Err(ServerError(response->code(), "Expected a string array"));
                     }
-                    tags.insert(item.as_string());
+                    tags.insert(item.asString().unwrap());
                 }
                 return Ok(tags);
             }
diff --git a/loader/src/server/Server.hpp b/loader/src/server/Server.hpp
index b801f8d7..110f4e8f 100644
--- a/loader/src/server/Server.hpp
+++ b/loader/src/server/Server.hpp
@@ -4,7 +4,7 @@
 #include <Geode/DefaultInclude.hpp>
 #include <Geode/utils/web.hpp>
 #include <chrono>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <vector>
 
 using namespace geode::prelude;
diff --git a/loader/src/utils/JsonValidation.cpp b/loader/src/utils/JsonValidation.cpp
index 1f1df324..f0a936aa 100644
--- a/loader/src/utils/JsonValidation.cpp
+++ b/loader/src/utils/JsonValidation.cpp
@@ -168,6 +168,19 @@ JsonExpectedValue JsonExpectedValue::has(std::string_view key) {
     }
     return JsonExpectedValue(m_impl.get(), m_impl->scope[key], key);
 }
+JsonExpectedValue JsonExpectedValue::hasNullable(std::string_view key) {
+    if (this->hasError()) {
+        return JsonExpectedValue();
+    }
+    if (!this->assertIs(matjson::Type::Object)) {
+        return JsonExpectedValue();
+    }
+    m_impl->knownKeys.insert(std::string(key));
+    if (!m_impl->scope.contains(key) || m_impl->scope[key].isNull()) {
+        return JsonExpectedValue();
+    }
+    return JsonExpectedValue(m_impl.get(), m_impl->scope[key], key);
+}
 JsonExpectedValue JsonExpectedValue::needs(std::string_view key) {
     if (this->hasError()) {
         return JsonExpectedValue();
@@ -190,7 +203,7 @@ std::vector<std::pair<std::string, JsonExpectedValue>> JsonExpectedValue::proper
         return std::vector<std::pair<std::string, JsonExpectedValue>>();
     }
     std::vector<std::pair<std::string, JsonExpectedValue>> res;
-    for (auto& [k, v] : m_impl->scope.as_object()) {
+    for (auto& [k, v] : m_impl->scope) {
         res.push_back(std::make_pair(k, JsonExpectedValue(m_impl.get(), v, k)));
     }
     return res;
@@ -211,7 +224,7 @@ size_t JsonExpectedValue::length() {
     if (!this->assertIs(matjson::Type::Array)) {
         return 0;
     }
-    return m_impl->scope.as_array().size();
+    return m_impl->scope.size();
 }
 JsonExpectedValue JsonExpectedValue::at(size_t index) {
     if (this->hasError()) {
@@ -220,15 +233,14 @@ JsonExpectedValue JsonExpectedValue::at(size_t index) {
     if (!this->assertIs(matjson::Type::Array)) {
         return JsonExpectedValue();
     }
-    auto& arr = m_impl->scope.as_array();
-    if (arr.size() <= index) {
+    if (index >= m_impl->scope.size()) {
         this->setError(
             "array expected to have at least size {}, but its size was only {}",
-            index + 1, arr.size()
+            index + 1, m_impl->scope.size()
         );
         return JsonExpectedValue();
     }
-    return JsonExpectedValue(m_impl.get(), arr.at(index), std::to_string(index));
+    return JsonExpectedValue(m_impl.get(), m_impl->scope[index], std::to_string(index));
 }
 std::vector<JsonExpectedValue> JsonExpectedValue::items() {
     if (this->hasError()) {
@@ -239,7 +251,7 @@ std::vector<JsonExpectedValue> JsonExpectedValue::items() {
     }
     std::vector<JsonExpectedValue> res;
     size_t i = 0;
-    for (auto& v : m_impl->scope.as_array()) {
+    for (auto& v : m_impl->scope) {
         res.push_back(JsonExpectedValue(m_impl.get(), v, std::to_string(i++)));
     }
     return res;
diff --git a/loader/src/utils/VersionInfo.cpp b/loader/src/utils/VersionInfo.cpp
index 0c5c9658..069f674b 100644
--- a/loader/src/utils/VersionInfo.cpp
+++ b/loader/src/utils/VersionInfo.cpp
@@ -4,7 +4,7 @@
 
 #include <Geode/utils/VersionInfo.hpp>
 #include <Geode/utils/general.hpp>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 
 using namespace geode::prelude;
 
diff --git a/loader/src/utils/cocos.cpp b/loader/src/utils/cocos.cpp
index 3a8fa960..cfce8735 100644
--- a/loader/src/utils/cocos.cpp
+++ b/loader/src/utils/cocos.cpp
@@ -1,6 +1,6 @@
 #include <Geode/modify/LoadingLayer.hpp>
 #include <Geode/utils/cocos.hpp>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <charconv>
 #include <Geode/binding/CCTextInputNode.hpp>
 #include <Geode/binding/GameManager.hpp>
@@ -32,6 +32,7 @@ Result<cocos2d::ccColor3B, std::string> matjson::Serialize<ccColor3B>::fromJson(
         }
         return Ok(res.unwrap());
     }
+    return Err("Expected color to be array, object or hex string");
 }
 matjson::Value matjson::Serialize<ccColor3B>::toJson(cocos2d::ccColor3B const& value) {
     return matjson::makeObject({
@@ -68,6 +69,7 @@ Result<cocos2d::ccColor4B, std::string> matjson::Serialize<ccColor4B>::fromJson(
         }
         return Ok(res.unwrap());
     }
+    return Err("Expected color to be array, object or hex string");
 }
 
 matjson::Value matjson::Serialize<ccColor4B>::toJson(cocos2d::ccColor4B const& value) {
diff --git a/loader/src/utils/file.cpp b/loader/src/utils/file.cpp
index 5cba9d46..22037899 100644
--- a/loader/src/utils/file.cpp
+++ b/loader/src/utils/file.cpp
@@ -3,7 +3,7 @@
 #include <Geode/utils/file.hpp>
 #include <Geode/utils/map.hpp>
 #include <Geode/utils/string.hpp>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <fstream>
 #include <mz.h>
 #include <mz_os.h>
@@ -53,14 +53,10 @@ Result<std::string> utils::file::readString(std::filesystem::path const& path) {
 }
 
 Result<matjson::Value> utils::file::readJson(std::filesystem::path const& path) {
-    auto str = utils::file::readString(path);
-    if (!str)
-        return Err(str.unwrapErr());
-    std::string error;
-    auto res = matjson::parse(str.unwrap(), error);
-    if (error.size())
-        return Err("Unable to parse JSON: " + error);
-    return Ok(res.value());
+    auto str = GEODE_UNWRAP(utils::file::readString(path));
+    return matjson::parse(str).mapErr([&](auto const& err) {
+        return fmt::format("Unable to parse JSON: {}", err);
+    });
 }
 
 Result<ByteVector> utils::file::readBinary(std::filesystem::path const& path) {
diff --git a/loader/src/utils/web.cpp b/loader/src/utils/web.cpp
index 0cf732ec..4f872b36 100644
--- a/loader/src/utils/web.cpp
+++ b/loader/src/utils/web.cpp
@@ -3,7 +3,7 @@
 #include <filesystem>
 #include <fmt/core.h>
 #include <fstream>
-#include <matjson3.hpp>
+#include <matjson.hpp>
 #include <system_error>
 #define CURL_STATICLIB
 #include <curl/curl.h>
@@ -130,12 +130,9 @@ Result<std::string> WebResponse::string() const {
 }
 Result<matjson::Value> WebResponse::json() const {
     GEODE_UNWRAP_INTO(auto value, this->string());
-    std::string error;
-    auto res = matjson::parse(value, error);
-    if (error.size() > 0) {
-        return Err("Error parsing JSON: " + error);
-    }
-    return Ok(res.value());
+    return matjson::parse(value).mapErr([&](auto const& err) {
+        return fmt::format("Error parsing JSON: {}", err);
+    });
 }
 ByteVector WebResponse::data() const {
     return m_impl->m_data;
@@ -595,7 +592,8 @@ WebRequest& WebRequest::bodyString(std::string_view str) {
 }
 WebRequest& WebRequest::bodyJSON(matjson::Value const& json) {
     this->header("Content-Type", "application/json");
-    std::string str = json.dump(matjson::NO_INDENTATION);
+    // TODO: mat
+    std::string str = json.dump(matjson::NO_INDENTATION).unwrapOr("");
     m_impl->m_body = ByteVector { str.begin(), str.end() };
     return *this;
 }