Introducing Query-based Security Rules

Firebase Realtime Database query-based rules add a query variable to security rules, enabling developers to restrict read access according to query parameters such as ordering, ranges, equality filters, and result limits. For example, rules can require clients to order records by key and retrieve no more than a specified number of entries, preventing broader or differently structured queries from succeeding. The feature can also simplify database designs by allowing per-user access controls on a flat collection: records can contain a user ID field, while rules require authenticated users to query by that field and match their own ID. Query-based rules work alongside existing security rules, allowing teams to adopt them incrementally, and are available through Firebase tools including the console emulator and official documentation.

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