How can I use socket io for just server client communication?

Question

I would like to build a web page with interactive content.

I would like to use socket IO, but I've got a problem when I send two number from client to the server.

The server adds the two numbers and sends for every user (but I want just send back to the one user). I wouldn't like to store the users. So I would like to ask how can I build this example using NodeJS and Socket IO?

but the broadcast method is not good for me because send the message everyone else except me.but I want to send just a server and want to send the data for me back I don't want to send the data everyone. — Barbara Győri
– Barbara Győri, Commented Mar 15, 2019 at 13:56

bcg07 · Accepted Answer · 2019-03-15 15:23:04Z

if you look into socket.io docs, you will find out that you can specify the key for each message you send, for instance:

io.on('connection', function (socket) { // specify a clientId for each client you have, you may define it at the moment the connection starts. socket.emit(`news:${clientId}`, { hello: 'world' }); });

And, on the client side, you have:

socket.on(`news:${myClientId}`, function (data) { console.log(data); });

You may generate this id randomly by using many libraries, for instance Node-Forge.

Hope it helps! Feel free to ask further.

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