diff --git a/README.md b/README.md
index 035d73b..9ad2f7c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,19 @@
 # snatch-server
 Snatch backend node server base on expressjs.
+
+This is the backend of [Snatch](https://github.com/ZhichengChen/snatch), Snatch is a Sketch plugin that upload layer to CDN directly.
+
+## Usage
+
+Install the dependencies
+
+```bash
+npm install
+```
+
+Once the installation is done, you can run the server:
+
+```bash
+node index.js
+```
+
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..52b6a05
--- /dev/null
+++ b/index.js
@@ -0,0 +1,40 @@
+const express = require('express');
+const app = express();
+const bodyParser = require('body-parser');
+const sharp = require('sharp');
+
+app.use(bodyParser.urlencoded({extended: false, limit: '50mb'}))
+app.use(bodyParser.json({limit:'50mb'}))
+
+const boostSize = {
+	'pic_wheel': [353, 353, 'png'],
+	'pic_arrow': [45, 60, 'png'],
+	'btn_luckydraw': [292, 77, 'png'],
+	'bg_blue': [360, 640, 'jpg']
+}
+
+app.post('/', function(req, res) {
+	const size = boostSize[req.body.name];
+	if (!size) {
+		return res.send('Name invalid!');
+	}
+	let buff = new Buffer(req.body.image, 'base64');
+	let resize = sharp(buff)
+					.resize(size[0], size[1]);
+	if (size[2]=='jpg') {
+		resize = resize.jpeg();
+	} else {
+		resize = resize.png({adaptiveFiltering: true})
+	}
+	resize.toFile(req.body.name+'.'+size[2], (err) => { 
+		if (err) {
+			return res.send(err);
+		} else {
+			return res.send('Upload Success!');
+		}
+	});
+});
+
+app.listen(3000, function(){
+	console.log('ok.');
+});
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..59a7141
--- /dev/null
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "snatch-server",
+  "version": "1.0.0",
+  "description": "Snatch backend node server base on expressjs.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "chenzhicheng.com",
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.18.3",
+    "express": "^4.16.4",
+    "sharp": "^0.22.0"
+  }
+}