leptos-error-handling

To handle Leptos server function errors safely, define an AppError enum implementing FromServerFnError to frame errors and prevent leaking internal details to the client. This approach maps domain errors into serializable, client-friendly messages.

Map SQLx database errors to HTTP responses in Axum by implementing the IntoResponse trait for your AppError enum. This translates sqlx::Error variants, such as RowNotFound to NotFound status codes, and logs database errors internally before returning safe HTTP responses.

Display validation errors to users in Leptos by returning an AppError::Validation variant from your server function. This returns a 422 HTTP status with helpful messages, which you can catch and render by wrapping your UI closures with the ErrorBoundary view component.

Yes, AppError must be Clone, Serialize, and Deserialize to work effectively with Leptos server functions. Serialization is required to transmit the error state cleanly across the WebAssembly client and server boundary for consistent rendering.

The best way to structure a unified error handling layer for Leptos and Axum is creating a single AppError domain enum. This centralizes error logic by implementing FromServerFnError for server functions and IntoResponse for Axum endpoints, ensuring consistent HTTP status codes and safe error bodies across both environments.