diff --git a/app/index.js b/app/index.js
index c7e2475..c58bd1e 100644
--- a/app/index.js
+++ b/app/index.js
@@ -24,6 +24,7 @@ client.on("beforeLogin", () =>
 
 client.on("ready", () => {
 	parseLinksInGuilds().then(doGuildIteration);
+	require("./legacy-upgrader.js")(); //upgrade legacy json into new database format
 });
 
 client.on("message", message => {
diff --git a/app/legacy-upgrader.js b/app/legacy-upgrader.js
new file mode 100644
index 0000000..2010ed7
--- /dev/null
+++ b/app/legacy-upgrader.js
@@ -0,0 +1,28 @@
+const NewGuildData = require("./models/guild-data.js");
+const NewFeedData = require("./models/feed-data.js");
+const FileSystem = require("fs");
+
+module.exports = function () {
+	if (!FileSystem.existsSync("./guilds.json"))
+		return;
+
+	const legacyJson = require("../guilds.json");
+
+	for (let guildID of Object.keys(legacyJson)) {
+		const guildData = NewGuildData.create({ guildID });
+
+		for (let feed of legacyJson[guildID].feeds) {
+			guildData.feeds.push(NewFeedData.create({
+				feedID: feed.id,
+				url: feed.url,
+				roleID: feed.roleID,
+				cachedLinks: feed.cachedLinks,
+				maxCacheSize: feed.maxCacheSize
+			}));
+		}
+
+		guildData.save();
+	}
+
+	FileSystem.unlinkSync("./guilds.json");
+};
\ No newline at end of file