diff --git a/d/.gitignore b/d/.gitignore
index 0158b86..8a14e5c 100644
--- a/d/.gitignore
+++ b/d/.gitignore
@@ -14,3 +14,4 @@ d-test-*
 *.o
 *.obj
 *.lst
+data.d
diff --git a/d/README.md b/d/README.md
index bb4782f..4e288bd 100644
--- a/d/README.md
+++ b/d/README.md
@@ -21,6 +21,11 @@ Algeria's college hierarchy dataset as a D package
 cd d && dub test
 ```
 
+- Build data:
+```sh
+cd d/build && dub
+```
+
 # Contribute
 
 Feel free to ask for help in [#kuliya](https://dzcode.slack.com/archives/C01C0155CKC) group chat
diff --git a/d/build/.gitignore b/d/build/.gitignore
new file mode 100644
index 0000000..1b2211d
--- /dev/null
+++ b/d/build/.gitignore
@@ -0,0 +1 @@
+build*
diff --git a/d/build/dub.json b/d/build/dub.json
new file mode 100644
index 0000000..af124f6
--- /dev/null
+++ b/d/build/dub.json
@@ -0,0 +1,6 @@
+{
+	"dependencies": {
+		"asdf": "~>0.7.17"
+	},
+	"name": "build"
+}
\ No newline at end of file
diff --git a/d/build/dub.selections.json b/d/build/dub.selections.json
new file mode 100644
index 0000000..416b9d5
--- /dev/null
+++ b/d/build/dub.selections.json
@@ -0,0 +1,9 @@
+{
+	"fileVersion": 1,
+	"versions": {
+		"asdf": "0.7.17",
+		"mir-algorithm": "3.22.1",
+		"mir-core": "1.7.1",
+		"silly": "1.1.1"
+	}
+}
diff --git a/d/build/source/app.d b/d/build/source/app.d
new file mode 100644
index 0000000..7b0349e
--- /dev/null
+++ b/d/build/source/app.d
@@ -0,0 +1,237 @@
+/++
+This module is responsible for generating the data file from the info.json files.
++/
+module app;
+
+import std.file : readText, write, exists, remove;
+import std.typecons : Nullable;
+import asdf;
+import std.stdio : writeln, File;
+import std.algorithm;
+import std.array;
+
+/++
+Data path to the info.json files
++/
+const string DATA_PATH = "../../_data/";
+/++
+Data D file to save the schema
++/
+const string DATA_FILE = "../source/kuliya/data.d";
+
+/++
+Kuliya types
++/
+enum Type
+{
+    UNIVERSITY,
+    ACADEMY,
+    PRIVATE_SCHOOL,
+    INSTITUTE,
+    FACULTY,
+    DEPARTMENT,
+    SPECIALTY,
+    SECTOR
+}
+
+/++
+Kuliya name
++/
+struct Name
+{
+    /// Arabic name
+    string ar;
+    /// English name
+    string en;
+    /// French name
+    string fr;
+}
+
+/++
+Kuliya terms
++/
+struct Terms
+{
+    /// Number of slots per year
+    int perYear;
+    /// Slots
+    int[] slots;
+}
+
+/++
+Kuliya schema
++/
+struct Schema
+{
+    /// Name
+    Name name;
+    /// Type
+    Type type;
+    /// Terms
+    @serdeOptional
+    Nullable!Terms terms;
+}
+
+/++
+Save schema to file
+Params:
+    schema = Schema to save
+    path = Path of the info.json file
++/
+void saveToFile(const Schema schema, string path) @trusted
+{
+    // remove ../_data/ prefix and /info.json suffix from path
+    const auto pathParts = path.splitter('/').array;
+    const auto filePath = pathParts[3 .. $ - 1].join("/");
+    // replace / with _ in filePath
+    const auto filePathUnderscored = filePath.replace("/", "_");
+    File file = File(DATA_FILE, "a");
+    file.writeln("immutable Schema ", filePathUnderscored, " = Schema(");
+    file.writeln("    Name(\"", schema.name.ar, "\", \"", schema.name.en, "\", \"", schema.name.fr, "\"),");
+    file.writeln("    Type.", schema.type, ",");
+    if (schema.terms.isNull)
+    {
+        file.writeln("    Terms.init");
+    }
+    else
+    {
+        // file.writeln("    Nullable!Terms({", schema.terms.get.perYear, ", [", schema.terms.get.slots.join(", "), "]});"); // no propery join on const(int[]) error
+        file.write("    Terms(", schema.terms.get.perYear, ", [", schema
+                .terms.get.slots[0]);
+        foreach (i, slot; schema.terms.get.slots[1 .. $])
+        {
+            file.write(", ", slot);
+        }
+        file.writeln("])");
+    }
+    file.writeln(");");
+    file.writeln();
+    file.close();
+}
+
+/++
+Parse info.json file to Schema struct
+Params:
+    path = Path of the info.json file
+Returns:
+    Schema
++/
+Schema parseInfoJson(string path) @trusted
+{
+    const auto data = readText(path);
+    Schema schema;
+    schema = asdf.deserialize!Schema(data);
+    return schema;
+}
+
+/++
+Walk through directories and parse info.json files
+Params:
+    path = Path of the directory
++/
+void walkDirs(string path) @trusted
+{
+    import std.file : DirEntry, dirEntries, isDir, isFile, SpanMode;
+
+    foreach (entry; dirEntries(path, SpanMode.shallow, false))
+    {
+        if (isDir(entry.name))
+        {
+            walkDirs(entry.name);
+        }
+        else if (isFile(entry.name) && entry.name.endsWith("info.json"))
+        {
+            const auto schema = parseInfoJson(entry.name);
+            saveToFile(schema, entry.name);
+        }
+    }
+}
+
+/++
+Prepare data file with the schema structure
++/
+void prepareDataFile() @trusted
+{
+    File file = File(DATA_FILE, "w");
+    file.writeln("// This is an auto generated file, do not edit it!");
+    file.writeln("module kuliya.data;");
+    file.writeln();
+    file.writeln("import std.typecons : Nullable;");
+    file.writeln();
+    file.writeln("/++");
+    file.writeln("Kuliya types");
+    file.writeln("+/");
+    file.writeln("enum Type");
+    file.writeln("{");
+    file.writeln("    UNIVERSITY,");
+    file.writeln("    ACADEMY,");
+    file.writeln("    PRIVATE_SCHOOL,");
+    file.writeln("    INSTITUTE,");
+    file.writeln("    FACULTY,");
+    file.writeln("    DEPARTMENT,");
+    file.writeln("    SPECIALTY,");
+    file.writeln("    SECTOR");
+    file.writeln("}");
+    file.writeln();
+    file.writeln("/++");
+    file.writeln("Kuliya name");
+    file.writeln("+/");
+    file.writeln("struct Name");
+    file.writeln("{");
+    file.writeln("    /// Arabic name");
+    file.writeln("    string ar;");
+    file.writeln("    /// English name");
+    file.writeln("    string en;");
+    file.writeln("    /// French name");
+    file.writeln("    string fr;");
+    file.writeln("}");
+    file.writeln();
+    file.writeln("/++");
+    file.writeln("Kuliya terms");
+    file.writeln("+/");
+    file.writeln("struct Terms");
+    file.writeln("{");
+    file.writeln("    /// Number of slots per year");
+    file.writeln("    int perYear;");
+    file.writeln("    /// Slots");
+    file.writeln("    int[] slots;");
+    file.writeln("}");
+    file.writeln();
+    file.writeln("/++");
+    file.writeln("Kuliya schema");
+    file.writeln("+/");
+    file.writeln("struct Schema");
+    file.writeln("{");
+    file.writeln("    /// Name");
+    file.writeln("    Name name;");
+    file.writeln("    /// Type");
+    file.writeln("    Type type;");
+    file.writeln("    /// Terms");
+    file.writeln("    Nullable!Terms terms;");
+    file.writeln();
+    file.writeln("    this(Name name, Type type, Terms terms)");
+    file.writeln("    {");
+    file.writeln("        this.name = name;");
+    file.writeln("        this.type = type;");
+    file.writeln("        this.terms = Nullable!Terms(terms);");
+    file.writeln("    }");
+    file.writeln("}");
+    file.writeln();
+    file.close();
+}
+
+void main() @trusted
+{
+    try
+    {
+        if (exists(DATA_FILE))
+            remove(DATA_FILE);
+        prepareDataFile();
+        walkDirs(DATA_PATH);
+    }
+    catch (Exception e)
+    {
+        writeln("Error: ", e.msg);
+        return;
+    }
+}