GraphQL Playground enabled by default in Apollo Server

Preventing accidental public access

Apollo Server exposes the GraphQL Playground UI and the introspection endpoint unless explicitly disabled. When a deployment is reachable over the internet, this default behavior can allow unauthenticated users to query the schema, discover sensitive fields, or execute costly operations.

Developers typically rely on middleware or custom context logic to enforce authentication, but the server itself does not automatically block unauthenticated requests or set restrictive CORS policies. This creates an uncertainty: is the Playground truly disabled when the configuration flag is omitted, and how does the server react to cross‑origin requests?

Given these ambiguities, we need to clarify the exact behavior and recommend secure defaults.

Unresolved questions

• What configuration options exist to disable the Playground and introspection by default in Apollo Server?
• How can CORS be configured to restrict cross‑origin access without inadvertently blocking legitimate internal clients?
• What is the recommended pattern for integrating authentication middleware that reliably blocks unauthenticated GraphQL queries?