diff --git a/concraft-sgjp-model.nix b/concraft-sgjp-model.nix
new file mode 100644
index 0000000..d268179
--- /dev/null
+++ b/concraft-sgjp-model.nix
@@ -0,0 +1,5 @@
+{fetchurl, ...}:
+fetchurl {
+  url = "https://zil.ipipan.waw.pl/Concraft?action=AttachFile&do=get&target=concraft-pl-model-SGJP-20220221.gz";
+  hash = "sha256-VcvdSkJwUhAgHroA0d/bH3QDjjO/2x8HqSuUvRgIN/4=";
+}
diff --git a/conmorfeusz.nix b/conmorfeusz.nix
index 31252e0..77c5484 100644
--- a/conmorfeusz.nix
+++ b/conmorfeusz.nix
@@ -1,38 +1,35 @@
 {
   self,
+  pkgs,
   stdenv,
   lib,
   writers,
+  writeScriptBin,
   nodejs,
   fetchurl,
-  model ? "",
+  model ? null,
   serverUrl ? "",
   local ? true,
   ...
-}: let
-  sgjpModel = fetchurl {
-    url = "https://zil.ipipan.waw.pl/Concraft?action=AttachFile&do=get&target=concraft-pl-model-SGJP-20220221.gz";
-    hash = "sha256-VcvdSkJwUhAgHroA0d/bH3QDjjO/2x8HqSuUvRgIN/4=";
-  };
+}:
+writeScriptBin "conmorfeusz" ''
+  #!/${nodejs}/bin/node
+  // Passed from Nix derivation config
+  const MORFEUSZ_ANALYSER_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_analyzer";
+  const MORFEUSZ_GENERATOR_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_generator";
+  const CONCRAFT_BIN="${self.packages.${stdenv.hostPlatform.system}.concraft-pl}/bin/concraft-pl";
+  const CONCRAFT_MODEL="${
+    if model != null
+    then model
+    else pkgs.callPackage ./concraft-sgjp-model.nix {}
+  }";
+  const CONCRAFT_SERVER_URL="${serverUrl}";
+  const CONCRAFT_MODE="${
+    if local
+    then "local"
+    else "remote"
+  }";
+  // =================================
 
-  targetModel =
-    if model == ""
-    then sgjpModel
-    else model;
-in
-  writers.makeScriptWriter {interpreter = "${nodejs}/bin/node";} "conmorfeusz" ''
-    // Passed from Nix derivation config
-    const MORFEUSZ_ANALYSER_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_analyzer";
-    const MORFEUSZ_GENERATOR_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_generator";
-    const CONCRAFT_BIN="${self.packages.${stdenv.hostPlatform.system}.concraft-pl}/bin/concraft-pl";
-    const CONCRAFT_MODEL="${targetModel}";
-    const CONCRAFT_SERVER_URL="${serverUrl}";
-    const CONCRAFT_MODE="${
-      if local
-      then "local"
-      else "remote"
-    }";
-    // =================================
-
-    ${builtins.readFile ./index.js}
-  ''
+  ${builtins.readFile ./index.js}
+''
diff --git a/index.js b/index.js
index 792626d..f7107d7 100755
--- a/index.js
+++ b/index.js
@@ -97,7 +97,7 @@ async function danalyse(input) {
   return await desambiguate(analysis);
 }
 
-function generate(text, ...tags) {  
+function generate(input, ...tags) {  
   const { stdout } = spawnSync(MORFEUSZ_GENERATOR_BIN, [], { input });
   
   const linePattern = /^\s?(?<opening>\[)?(?<segment>,|(.+?)),(?<lemma>,|(.+?)),(?<tags>[\w:.]+),(?<frequency>_|(.+?)),(?<qualifiers>_|(.+?))(?<ending>\])?$/;
diff --git a/module.nix b/module.nix
index ea8f50d..18f5d75 100644
--- a/module.nix
+++ b/module.nix
@@ -1,2 +1,67 @@
-{...}: {
+self: {
+  config,
+  system,
+  pkgs,
+  lib,
+  ...
+}: let
+  cfg = config.services.conmorfeusz;
+  morfeusz = self.packages.${system}.morfeusz;
+  concraft-pl = self.packages.${system}.concraft-pl;
+  conmorfeusz = self.packages.${system}.conmorfeusz;
+
+  serverConfig = cfg.server.config // {port = toString cfg.server.port;};
+in {
+  options.services.conmorfeusz = with lib; {
+    enable = mkEnableOption "conmorfeusz";
+
+    model = mkOption {
+      type = types.nullOr types.package;
+      description = "The target concraft-pl model";
+      default = null;
+    };
+
+    server = {
+      enable = mkEnableOption "concraft-pl server";
+      port = mkOption {
+        type = types.port;
+        description = "Port on which server should listen";
+        default = 8080;
+      };
+
+      config = mkOption {
+        type = types.attrs;
+        description = "CLI parameters of 'concraft-pl server' command";
+        default = {
+          inmodel = toString (pkgs.callPackage ./concraft-sgjp-model.nix {});
+        };
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [
+      morfeusz
+      concraft-pl
+      (conmorfeusz.override {
+        model = cfg.model;
+        local = !cfg.server.enable;
+        serverUrl =
+          if cfg.server.enable
+          then "http://localhost:${toString cfg.server.port}"
+          else null;
+      })
+    ];
+
+    systemd.services.conmorfeusz = lib.mkIf cfg.server.enable {
+      enable = true;
+      description = "Conmorfeusz";
+
+      wantedBy = ["multi-user.target"];
+
+      serviceConfig = {
+        ExecStart = "${concraft-pl}/bin/concraft-pl server ${lib.cli.toGNUCommandLineShell {} serverConfig}";
+      };
+    };
+  };
 }