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+# Grocy {#module-services-grocy}
+
+[Grocy](https://grocy.info/) is a web-based self-hosted groceries
+& household management solution for your home.
+
+## Basic usage {#module-services-grocy-basic-usage}
+
+A very basic configuration may look like this:
+```
+{ pkgs, ... }:
+{
+  services.grocy = {
+    enable = true;
+    hostName = "grocy.tld";
+  };
+}
+```
+This configures a simple vhost using [nginx](#opt-services.nginx.enable)
+which listens to `grocy.tld` with fully configured ACME/LE (this can be
+disabled by setting [services.grocy.nginx.enableSSL](#opt-services.grocy.nginx.enableSSL)
+to `false`). After the initial setup the credentials `admin:admin`
+can be used to login.
+
+The application's state is persisted at `/var/lib/grocy/grocy.db` in a
+`sqlite3` database. The migration is applied when requesting the `/`-route
+of the application.
+
+## Settings {#module-services-grocy-settings}
+
+The configuration for `grocy` is located at `/etc/grocy/config.php`.
+By default, the following settings can be defined in the NixOS-configuration:
+```
+{ pkgs, ... }:
+{
+  services.grocy.settings = {
+    # The default currency in the system for invoices etc.
+    # Please note that exchange rates aren't taken into account, this
+    # is just the setting for what's shown in the frontend.
+    currency = "EUR";
+
+    # The display language (and locale configuration) for grocy.
+    culture = "de";
+
+    calendar = {
+      # Whether or not to show the week-numbers
+      # in the calendar.
+      showWeekNumber = true;
+
+      # Index of the first day to be shown in the calendar (0=Sunday, 1=Monday,
+      # 2=Tuesday and so on).
+      firstDayOfWeek = 2;
+    };
+  };
+}
+```
+
+If you want to alter the configuration file on your own, you can do this manually with
+an expression like this:
+```
+{ lib, ... }:
+{
+  environment.etc."grocy/config.php".text = lib.mkAfter ''
+    // Arbitrary PHP code in grocy's configuration file
+  '';
+}
+```