diff --git a/src/env.zig b/src/env.zig
new file mode 100644
index 0000000..73854dd
--- /dev/null
+++ b/src/env.zig
@@ -0,0 +1,45 @@
+const std = @import("std");
+
+pub const Env = struct {
+    data_dir: []const u8,
+    pub fn init(allocator: std.mem.Allocator, env_map: *const std.process.Environ.Map) !Env {
+        const data_dir = if (env_map.get("XDG_DATA_HOME")) |xdg_data_home|
+            try std.fmt.allocPrint(allocator, "{s}/zos", .{xdg_data_home})
+        else blk: {
+            const home = env_map.get("HOME").?;
+            break :blk try std.fmt.allocPrint(
+                allocator,
+                "{s}/.local/share/zos",
+                .{home},
+            );
+        };
+        return .{ .data_dir = data_dir };
+    }
+
+    pub fn deinit(env: Env, allocator: std.mem.Allocator) void {
+        allocator.free(env.data_dir);
+    }
+};
+
+test "Validate that missing xdg data dir is default" {
+    const allocator = std.testing.allocator;
+    var env_map = std.process.Environ.Map.init(allocator);
+    defer env_map.deinit();
+
+    try env_map.put("HOME", "/home/aselimov");
+    const env: Env = try .init(allocator, &env_map);
+    defer env.deinit(allocator);
+    std.debug.print("{s}", .{env.data_dir});
+    try std.testing.expect(std.mem.eql(u8, env.data_dir, "/home/aselimov/.local/share/zos"));
+}
+
+test "Validate that xdg data dir sets data dir" {
+    const allocator = std.testing.allocator;
+    var env_map = std.process.Environ.Map.init(allocator);
+    try env_map.put("XDG_DATA_HOME", "/home/aselimov/share");
+    defer env_map.deinit();
+
+    const env: Env = try .init(allocator, &env_map);
+    defer env.deinit(allocator);
+    try std.testing.expect(std.mem.eql(u8, env.data_dir, "/home/aselimov/share/zos"));
+}
diff --git a/src/notes/model.zig b/src/notes/model.zig
new file mode 100644
index 0000000..0bd3889
--- /dev/null
+++ b/src/notes/model.zig
@@ -0,0 +1,25 @@
+const std = @import("std");
+const Note = @This();
+
+name: []const u8,
+tags: []const []const u8,
+path: []const u8,
+
+pub fn init() Note {
+    return .{ .name = "", .tags = .empty, .path = "" };
+}
+
+test "Parse from json" {
+    const allocator = std.testing.allocator;
+    const json_string = "{\"name\": \"test\", \"tags\":[\"tag1\", \"tag2\"], \"path\":\"/path/to/test\"}";
+
+    const result = try std.json.parseFromSlice(Note, allocator, json_string, .{});
+    defer result.deinit();
+
+    const expect = std.testing.expect;
+
+    try expect(std.mem.eql(u8, "test", result.value.name));
+    try expect(std.mem.eql(u8, "tag1", result.value.tags[0]));
+    try expect(std.mem.eql(u8, "tag2", result.value.tags[1]));
+    try expect(std.mem.eql(u8, "/path/to/test", result.value.path));
+}