initial done

model.js

@@ -0,0 +1,24 @@
+const fs = require("fs");
+
+let urls = require("./model.json");
+
+function save(url, shortened) {
+  urls.push({url: url, shortened: shortened});
+  commit();
+}
+
+function commit() {
+  fs.writeFile("./model.json", JSON.stringify(urls));
+}
+
+function search(key) {
+  for (let model of urls) {
+    if (key == model.shortened) return model;
+  }
+  return null;
+}
+
+module.exports = {
+  save: save,
+  search: search,
+}