root: { conversations: { // conversations '-2h6WJbFPBxUs15iB15DnSAIRTyP2-1482823102860': { participants: { '2h6WJbFPBxUs15iB15DnSAIRTyP2': user, '1482823102860': user }, chats: { '-KZzCufnRDtS4h0q9fL': { content: '', time: '', user: {} } } }, ... }, user: { // online users '2h6WJbFPBxUs15iB15DnSAIRTyP2': user, ... } } 

git clone https://github.com/RaoHai/chat.git cd chat npm install npm start // enjoy :D