1) I have downloaded sample NodeJS integration sample zip
2) Extracted 3 files
 to the same folder including instructions.txt
3) From command prompt 
C:\AdminPortal>node main.js
 4) Browser request 
http:\\127.0.0.1:8080 or http:\\localhost:8080 requests
 5) Error Message 
C:\AdminPortal>node main.js
_http_outgoing.js:642
    throw new TypeError(‘First argument must be a string or Buffer’);
    ^
TypeError: First argument must be a string or Buffer
    at write_ (_http_outgoing.js:642:11)
    at ServerResponse.write (_http_outgoing.js:617:10)
    at ReadFileContext.callback (C:\express\AdminPortal\main.js:6:9)
    at FSReqWrap.readFileAfterOpen [as oncomplete] (fs.js:420:13)