javascript - How can i map client id with their respective sockets in node.js? -

good day all, i'm playing socket.io in nodejs,i'm working on chat application,on front end user has list of connected users if user clicks particular user list , sends message front-end so.

 sendmessage: function (event) {     if (event.keycode == 13) {          let target = event.target;         var msg = target.value;         //create object of chatschema          var packet={"chatid":"","userid":"","username":this.state.localusername,"message":msg,         "socketid":socket.id,"to":this.props.remoteusername};         console.log('packet: '+packet.message);         // socket.emit('chat mssg', msg, socket.id,packet);          socket.emit('chat mssg', packet);         // alert('pushing msg ');         var newlocalmsg = this.state.localstatemessages;         var allmsgs = this.state.allmessages;         var message = { "message": msg, "mesgtype": "local" };         allmsgs.push(message);         newlocalmsg.push(msg);         this.setstate({ localstatemessages: newlocalmsg, messagetype: 'local', allmessages: allmsgs });         target.value = '';       }   } 

the packet i'm sending server includes information user user message being sent along socketid of user sending message. on server side i'm handling event so

 socket.on('setup localuser',function(person){     console.log(person.firstname+' connected id:'+socket.id);     console.log(person);     //push socketid client[] along username;     clients.push({"socketid":socket.id,"username":person.firstname}); }) socket.on('chat mssg', function (packet) {     console.log(packet.username+' wants send message '+packet.to);     console.log(packet.username +':'+ packet.message );     //iterate through clients , find connected socket associated intended recipent , emit msg            var receiver=clients.find(function(client){                return client.username===packet.to;           })             io.sockets.connected[receiver.socket.id].emit('chat mssg',packet.username+ ':'+packet.message);           console.log(receiver.username);       console.log('socket id :' + socket.id); }) 

what i'm doing pushing each socketid along username array clients , on reception of event 'chat mssg' i'm iterating through clients array , trying find socket.id of user whom message sent , emit event on socketid doesn't work, doesn't print receiver.username console,the receiver variable goes undefined in case. tried clients.map() didn't me required intended recipient either. how can it? thank helping me :d