title: How can I launch this Agora WebRTC sample node.js server?
body: <p>I'm node.js beginner and try to use Agora WebRTC SDK with reading this document.</p>
  
  <p><a href="https://docs.agora.io/en/user_guide/communication/webrtc_user_guide_communication.html#qs-communication-webrtc" rel="nofollow noreferrer">https://docs.agora.io/en/user_guide/communication/webrtc_user_guide_communication.html#qs-communication-webrtc</a></p>
  
  <p>Regarding sever topic in this Document,
  At first, I used "npm install" command to make nodo_modules.
  Next, I check APP_ID and APP_CERTIFICATE in ./server/nodejs/DemoServer.js.
  But I could not find them. Where should I fill in the value of APP_ID and APP_CERTIFICATE in DemoServer.js? VENDER_KEY?</p>
  
  <p>WebRTC Sample code is located in this download link.(No plug-ins)
  <a href="https://www.agora.io/en/blog/download/" rel="nofollow noreferrer">https://www.agora.io/en/blog/download/</a></p>
  
  <p>Please help me to launch this sample.</p>