Backend
Vapor 4.x — Server-Side Swift
Expert guidance for Vapor 4.x, the Swift server-side web framework built on SwiftNIO. Covers routing, Fluent ORM (models, migrations, relations, query builder), authentication (sessions, JWT, tokens), middleware, Content/Codable encoding, validation, WebSockets, Leaf templating, Redis-backed queues, testing with XCTVapor, Swift Package Manager project structure, async/await concurrency, Sendable conformance, error handling, and deployment (Docker, Linux, cloud). Activate for Vapor, server-side Swift, Fluent ORM, Swift web API, or Swift backend development. Do NOT activate for iOS, SwiftUI, Kitura, Perfect, or non-Swift web frameworks.