keyed_form

Schema

Validate untyped data with composable pure-Dart rules, then optionally generate typed models and field references.

Keyed Form Schema is a pure-Dart validation layer. You can use it on its own; code generation is an optional workflow for typed immutable models and references.

dart 
import 'package:keyed_form_schema/keyed_form_schema.dart';

final schema = ks.object({
  'email': ks.string().email(),
  'age': ks.int().min(18),
});

final errors = schema.validateMap({'email': 'person@example.com', 'age': 17});

validateMap returns keyed errors for invalid fields; it does not require generated classes or Flutter. Start with the builder and rule catalog, then see objects and collections, refinements and async validation, and code generation. For variant-shaped data, see discriminated unions.