diff --git a/.gitignore b/.gitignore
index f5adaf3..c1c5439 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,6 @@ result*
 
 # Misc
 .direnv
+
+# Build
+build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc7edb2..d723887 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,13 +6,34 @@ project(
         C
 )
 
-set(CMAKE_C_STANDARD 23)
-set(CMAKE_C_STANDARD_REQUIRED ON)
-set(CMAKE_C_EXTENSIONS OFF)
-
-add_executable(
+add_library(
     ${PROJECT_NAME}
-    main.c
     json.c
 )
+target_include_directories(
+    ${PROJECT_NAME}
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)
+set_target_properties(
+    ${PROJECT_NAME}
+    PROPERTIES
+        C_STANDARD 23
+        C_STANDARD_REQUIRED ON
+        C_EXTENSIONS OFF
+)
+
+install(TARGETS ${PROJECT_NAME} DESTINATION lib)
+install(FILES json.h DESTINATION include)
+
+option(BUILD_EXAMPLE "Build the example" OFF)
+if(BUILD_EXAMPLE)
+    add_subdirectory(example)
+endif()
+
+option(BUILD_TESTS "Build unit tests" OFF)
+if(BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(tests)
+endif()
 
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
new file mode 100644
index 0000000..ce84f81
--- /dev/null
+++ b/example/CMakeLists.txt
@@ -0,0 +1,22 @@
+add_executable(
+    example
+    main.c
+)
+set_target_properties(
+    example
+    PROPERTIES
+        C_STANDARD 23
+        C_STANDARD_REQUIRED ON
+        C_EXTENSIONS OFF
+)
+target_link_libraries(
+    example
+    PRIVATE
+        json
+)
+target_include_directories(
+    example
+    PRIVATE
+        ${CMAKE_SOURCE_DIR}
+)
+
diff --git a/example/main.c b/example/main.c
new file mode 100644
index 0000000..529b86f
--- /dev/null
+++ b/example/main.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+#include <json.h>
+
+int main()
+{
+    auto json = json_init(stdout, INDENT_2);
+
+    json_begin_object(&json);
+    {
+        json_add_object_field(&json, "array");
+        json_begin_array(&json);
+        {
+            json_add_string(&json, "element");
+            json_add_long(&json, 5l);
+            json_add_double(&json, 3.14);
+            json_add_bool(&json, true);
+            json_add_null(&json);
+        }
+        json_end_array(&json);
+    }
+    json_end_object(&json);
+
+    json_free(&json);
+}
+
diff --git a/flake.nix b/flake.nix
index 4cc5a94..b2df353 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,7 +15,7 @@
     flake-utils.lib.eachDefaultSystem (system:
     let
       pkgs = nixpkgs.legacyPackages.${system};
-      pname = "hello-world"; #package name
+      pname = "json"; #package name
       version = "0.0.1";
       src = ./.;
       buildInputs = with pkgs; [
diff --git a/main.c b/main.c
deleted file mode 100644
index 3a8a6f6..0000000
--- a/main.c
+++ /dev/null
@@ -1,50 +0,0 @@
-#include <stdio.h>
-
-#include "json.h"
-
-typedef struct Info {
-    int id;
-    const char* description;
-    bool enabled;
-} Info;
-
-#define INFO_LEN 2
-static const Info infos[INFO_LEN] = {
-    (Info){
-        .id = 0,
-        .description = "test",
-        .enabled = true,
-    },
-    (Info){
-        .id = 1,
-        .description = "Hello, World!",
-        .enabled = false,
-    },
-};
-
-int main()
-{
-    auto json = json_init(stdout, INDENT_2);
-
-    json_begin_array(&json);
-    for (int i = 0; i < INFO_LEN; i++) {
-        auto info = infos[i];
-
-        json_begin_object(&json);
-        {
-            json_add_object_field(&json, "id");
-            json_add_long(&json, info.id);
-
-            json_add_object_field(&json, "description");
-            json_add_string(&json, info.description);
-
-            json_add_object_field(&json, "enabled");
-            json_add_bool(&json, info.enabled);
-        }
-        json_end_object(&json);
-    }
-    json_end_array(&json);
-
-    json_free(&json);
-}
-
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
new file mode 100644
index 0000000..39b5967
--- /dev/null
+++ b/tests/CMakeLists.txt
@@ -0,0 +1,34 @@
+include(FetchContent)
+
+FetchContent_Declare(
+    Unity
+        GIT_REPOSITORY https://github.com/ThrowTheSwitch/Unity.git
+        GIT_TAG v2.6.1
+)
+FetchContent_MakeAvailable(Unity)
+
+add_executable(
+    json_test
+    json_test.c
+)
+set_target_properties(
+    json_test
+    PROPERTIES
+        C_STANDARD 23
+        C_STANDARD_REQUIRED ON
+        C_EXTENSIONS OFF
+)
+target_link_libraries(
+    json_test
+    PRIVATE
+        json
+        unity::framework
+)
+target_include_directories(
+    json_test
+    PRIVATE
+        ${CMAKE_SOURCE_DIR}
+)
+
+add_test(NAME json_test COMMAND json_test)
+
diff --git a/tests/json_test.c b/tests/json_test.c
new file mode 100644
index 0000000..37cc98f
--- /dev/null
+++ b/tests/json_test.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <unity.h>
+
+#include <json.h>
+
+static FILE* tmp = nullptr;
+static char buffer[256];
+
+static Json json;
+
+void setUp()
+{
+    tmp = tmpfile();
+    TEST_ASSERT_NOT_NULL(tmp);
+
+    json = json_init(tmp, MINIFIED);
+}
+
+void tearDown()
+{
+    json_free(&json);
+
+    if (tmp) {
+        fclose(tmp);
+        tmp = nullptr;
+    }
+}
+
+void test_json_add_string()
+{
+    json_add_string(&json, "string");
+    fflush(tmp);
+    rewind(tmp);
+
+    char buffer[256];
+    auto n = fread(buffer, 1, sizeof(buffer) - 1, tmp);
+    buffer[n] = '\0';
+
+    TEST_ASSERT_EQUAL_STRING("\"string\"", buffer);
+}
+
+int main()
+{
+    UNITY_BEGIN();
+    {
+        RUN_TEST(test_json_add_string);
+    }
+    return UNITY_END();
+}
+