What are subscriptions?

Q: What are subscriptions?

type Subscription { reviewCreated: Review } Similarly, a subscription is initiated using the subscription keyword as the operation type: subscription NewReviewCreated { reviewCreated { rating commentary } }

Difficulty: 6/10

real-time data, WebSocket transport, authorization

Subscriptions in GraphQL allow clients to receive real-time updates when certain events occur on the server. They are typically used for implementing features like live notifications, chat applications, or real-time data feeds. Subscriptions use WebSocket connections to push updates to clients as soon as relevant events occur.

Subscription fields are defined exactly as Query and Mutation fields are, but using the subscription root operation type instead:

Scenario Questions

0-2 years experience

2-5 years experience

1You added a subscription for order status updates, but after deploying, some users never receive the updates. Walk me through how you would debug the issue.

Follow-up Questions