diff --git a/.vscode/settings.json b/.vscode/settings.json
index 0172d50e4..6dc2f2d86 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -10,7 +10,8 @@
         "${workspaceFolder}/build/third_party/minizip/install/include",
         "${workspaceFolder}/build/third_party/nanoflann/install/include",
         "${workspaceFolder}/build/third_party/pybind11/install/include",
-        "${workspaceFolder}/build/third_party/spdlog/install/include"
+        "${workspaceFolder}/build/third_party/spdlog/install/include",
+        "${workspaceFolder}/build/third_party/json/install/include"
     ],
     "C_Cpp.default.browse.path": [
         "${workspaceFolder}/include",
@@ -23,7 +24,8 @@
         "${workspaceFolder}/build/third_party/minizip/install/include",
         "${workspaceFolder}/build/third_party/nanoflann/install/include",
         "${workspaceFolder}/build/third_party/pybind11/install/include",
-        "${workspaceFolder}/build/third_party/spdlog/install/include"
+        "${workspaceFolder}/build/third_party/spdlog/install/include",
+        "${workspaceFolder}/build/third_party/json/install/include"
     ],
     "files.watcherExclude": {
         "${workspaceFolder}/build/**": true
diff --git a/cmake/ConfigureJson.cmake b/cmake/ConfigureJson.cmake
new file mode 100644
index 000000000..e49762b18
--- /dev/null
+++ b/cmake/ConfigureJson.cmake
@@ -0,0 +1,27 @@
+#
+# Copyright (c) 2019 - 2026 Geode-solutions. All rights reserved.
+#
+
+
+set(JSON_PATH ${PROJECT_BINARY_DIR}/third_party/json)
+set(JSON_INSTALL_PREFIX ${JSON_PATH}/install)
+ExternalProject_Add(json
+    PREFIX ${JSON_PATH}
+    SOURCE_DIR ${JSON_PATH}/src
+    BINARY_DIR ${JSON_PATH}/build
+    STAMP_DIR ${JSON_PATH}/stamp
+    GIT_REPOSITORY https://github.com/nlohmann/json
+    GIT_TAG v3.11.3
+    GIT_SHALLOW ON
+    GIT_PROGRESS ON
+    CMAKE_GENERATOR ${CMAKE_GENERATOR}
+    CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
+    CMAKE_ARGS
+        -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+        -DCMAKE_INSTALL_MESSAGE=LAZY
+        -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    CMAKE_CACHE_ARGS
+        -DCMAKE_INSTALL_PREFIX:PATH=${JSON_INSTALL_PREFIX}
+        -DJSON_BuildTests:BOOL=OFF
+        -DJSON_MultipleHeaders:BOOL=ON
+)
diff --git a/cmake/ConfigureOpenGeode.cmake b/cmake/ConfigureOpenGeode.cmake
index 08dfbf08b..b2db56de9 100644
--- a/cmake/ConfigureOpenGeode.cmake
+++ b/cmake/ConfigureOpenGeode.cmake
@@ -56,6 +56,7 @@ ExternalProject_Add(opengeode
         -DPYBIND11_INSTALL_PREFIX:PATH=${PYBIND11_INSTALL_PREFIX}
         -DPYBIND11_PYTHON_VERSION:STRING=${PYTHON_VERSION}
         -DCMAKE_INSTALL_PREFIX:PATH=${OpenGeode_PATH_INSTALL}
+        -DJSON_INSTALL_PREFIX:PATH=${JSON_INSTALL_PREFIX}
     BINARY_DIR ${OpenGeode_PATH_BIN}
     DEPENDS
         abseil
@@ -66,6 +67,7 @@ ExternalProject_Add(opengeode
         minizip
         nanoflann
         spdlog
+        json
         ${bindings}
 )
 
diff --git a/cmake/OpenGeode.cmake b/cmake/OpenGeode.cmake
index 7c67b18e4..68ba4ae98 100644
--- a/cmake/OpenGeode.cmake
+++ b/cmake/OpenGeode.cmake
@@ -35,6 +35,7 @@ find_package(earcut_hpp REQUIRED CONFIG NO_DEFAULT_PATH PATHS ${EARCUT_INSTALL_P
 find_package(minizip-ng REQUIRED CONFIG NO_DEFAULT_PATH PATHS ${MINIZIP_INSTALL_PREFIX})
 find_package(nanoflann REQUIRED CONFIG NO_DEFAULT_PATH PATHS ${NANOFLANN_INSTALL_PREFIX})
 find_package(spdlog REQUIRED CONFIG NO_DEFAULT_PATH PATHS ${SPDLOG_INSTALL_PREFIX})
+find_package(nlohmann_json REQUIRED CONFIG NO_DEFAULT_PATH PATHS ${JSON_INSTALL_PREFIX})
 find_package(Threads REQUIRED)
 
 # Install OpenGeode third-parties
@@ -45,6 +46,7 @@ install(
         ${BITSERY_INSTALL_PREFIX}/
         ${GDAL_INSTALL_PREFIX}/
         ${PROJ_INSTALL_PREFIX}/
+        ${JSON_INSTALL_PREFIX}/
     DESTINATION
         .
     COMPONENT
diff --git a/cmake/OpenGeodeConfig.cmake.in b/cmake/OpenGeodeConfig.cmake.in
index 9aa673860..5222dd224 100644
--- a/cmake/OpenGeodeConfig.cmake.in
+++ b/cmake/OpenGeodeConfig.cmake.in
@@ -47,6 +47,7 @@ if(library_type STREQUAL "STATIC_LIBRARY")
     find_dependency(minizip-ng)
     find_dependency(nanoflann)
     find_dependency(spdlog)
+    find_dependency(nlohmann_json)
 endif()
 
 set(CMAKE_CXX_STANDARD @OPENGEODE_CXX_STANDARD@)
diff --git a/cmake/SuperBuild.cmake b/cmake/SuperBuild.cmake
index aa0e3bf62..463b354b4 100644
--- a/cmake/SuperBuild.cmake
+++ b/cmake/SuperBuild.cmake
@@ -58,6 +58,7 @@ include(${PROJECT_SOURCE_DIR}/cmake/ConfigureSpdlog.cmake)
 include(${PROJECT_SOURCE_DIR}/cmake/ConfigureSQLite.cmake)
 include(${PROJECT_SOURCE_DIR}/cmake/ConfigurePROJ.cmake)
 include(${PROJECT_SOURCE_DIR}/cmake/ConfigureGDAL.cmake)
+include(${PROJECT_SOURCE_DIR}/cmake/ConfigureJson.cmake)
 
 if(OPENGEODE_WITH_PYTHON OR INCLUDE_PYBIND11)
     include(${PROJECT_SOURCE_DIR}/cmake/ConfigurePybind11.cmake)
diff --git a/include/geode/basic/input.hpp b/include/geode/basic/input.hpp
index 5b981de22..8fb46c363 100644
--- a/include/geode/basic/input.hpp
+++ b/include/geode/basic/input.hpp
@@ -23,6 +23,8 @@
 
 #pragma once
 
+#include <absl/algorithm/container.h>
+
 #include <geode/basic/common.hpp>
 #include <geode/basic/io.hpp>
 #include <geode/basic/logger.hpp>