Image Upload in Android

You should to find where error occurs: before writeFile call or before middleware call. Also it's good to enhance your question with detailes: what actually happens and where process fails, does it create file or not, etc.

There could be several issues:

• Body is too big (100K for body-parser if I'm right).
• Body is corrupted (use md5 hash to ensure)

1. Android client code (not tested!):  
2.   
3.  public static void postData(Bitmap imageToSend) {  
4.         try  
5.         {  
6.             URL url = new URL("http://myserver/myapp/upload-image");  
7.             HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
8.             conn.setRequestMethod("POST");  
9.   
10.             conn.setDoInput(true);  
11.             conn.setDoOutput(true);  
12.   
13.             conn.setRequestProperty("Connection", "Keep-Alive");  
14.             conn.setRequestProperty("Cache-Control", "no-cache");  
15.   
16.             conn.setReadTimeout(35000);  
17.             conn.setConnectTimeout(35000);  
18.   
19.             // directly let .compress write binary image data  
20.             // to the output-stream  
21.             OutputStream os = conn.getOutputStream();  
22.             imageToSend.compress(Bitmap.CompressFormat.JPEG, 100, os);  
23.             os.flush();  
24.             os.close();  
25.   
26.             System.out.println("Response Code: " + conn.getResponseCode());  
27.   
28.             InputStream in = new BufferedInputStream(conn.getInputStream());  
29.             Log.d("sdfs", "sfsd");  
30.             BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(in));  
31.             String line = "";  
32.             StringBuilder stringBuilder = new StringBuilder();  
33.             while ((line = responseStreamReader.readLine()) != null)  
34.                 stringBuilder.append(line).append("\n");  
35.             responseStreamReader.close();  
36.   
37.             String response = stringBuilder.toString();  
38.             System.out.println(response);  
39.   
40.             conn.disconnect();  
41.         }  
42.         catch(MalformedURLException e) {  
43.             e.printStackTrace();  
44.         }  
45.         catch(IOException e) {  
46.             e.printStackTrace();  
47.         }  
48. }  
49. Node.js, Express code:  
50.   
51. function rawBody(req, res, next) {  
52.     var chunks = [];  
53.   
54.     req.on('data', function(chunk) {  
55.         chunks.push(chunk);  
56.     });  
57.   
58.     req.on('end', function() {  
59.         var buffer = Buffer.concat(chunks);  
60.   
61.         req.bodyLength = buffer.length;  
62.         req.rawBody = buffer;  
63.         next();  
64.     });  
65.   
66.     req.on('error', function (err) {  
67.         console.log(err);  
68.         res.status(500);  
69.     });  
70. }  
71.   
72. app.post('/upload-image', rawBody, function (req, res) {  
73.   
74.     if (req.rawBody && req.bodyLength > 0) {  
75.   
76.         // TODO save image (req.rawBody) somewhere  
77.   
78.         // send some content as JSON  
79.         res.send(200, {status: 'OK'});  
80.     } else {  
81.         res.send(500);  
82.     }  
83.   
84. });