GraphQL Subscriptions
To notify the client when messages are added to a channel, we’ll use GraphQL subscriptions, which allow the client to make a query and be notified of new results in the case of specific, server-side events. In our implementation of the server, we’ll use an Express server with WebSockets for pushing updates to the client.

In this tutorial, we’ll first add a subscription that notifies the client about new messages. Next, we’ll add a field to our GraphQL schema and implement a resolver for the subscription. Finally, we’ll use an in-memory pub-sub object that will handle passing along notifications about added messages.

#graphql #subscriptions #graphql server