diff --git a/parts/4/blogApp/src/app.js b/parts/4/blogApp/src/app.js
index 170b6ad..b6d10e1 100644
--- a/parts/4/blogApp/src/app.js
+++ b/parts/4/blogApp/src/app.js
@@ -1,19 +1,9 @@
 const express = require('express')
-const mongoose = require('mongoose')
-
+const db = require('./db')
 const app = express()
 
-const blogSchema = mongoose.Schema({
-  title: String,
-  author: String,
-  url: String,
-  likes: Number,
-})
+const Blog = db.Blog
 
-const Blog = mongoose.model('Blog', blogSchema)
-
-const mongoUrl = 'mongodb://localhost/bloglist'
-mongoose.connect(mongoUrl)
 
 app.use(express.json())
 
diff --git a/parts/4/blogApp/src/db.js b/parts/4/blogApp/src/db.js
new file mode 100644
index 0000000..d288a1d
--- /dev/null
+++ b/parts/4/blogApp/src/db.js
@@ -0,0 +1,15 @@
+const mongoose = require('mongoose')
+
+const blogSchema = mongoose.Schema({
+  title: String,
+  author: String,
+  url: String,
+  likes: Number,
+})
+
+const Blog = mongoose.model('Blog', blogSchema)
+
+const mongoUrl = 'mongodb://localhost/bloglist'
+mongoose.connect(mongoUrl)
+
+module.exports = {Blog}
\ No newline at end of file