Validations

You can use outher validation package but we recommend to use a simple package, 🧩 Zard is a schema validation and transformation library for Dart, inspired by the popular Zod library for JavaScript. With Zard, you can define schemas to validate and transform data easily and intuitively.

Zard


import 'package:zard/zard.dart';
 
final userSchema = z.map({
    'name': z.string().min(3).nullable(),
    'age': z.int().min(1).nullable(),
});
 
final user = {
    'name': 'John Doe',
    'age': 30,
};
 
final userData = schema.parse(user); // {name: John Doe, age: 30}

Zard + Darto


import 'package:darto/darto.dart';
import 'package:zard/zard.dart';
 
void main() {
  final app = Darto();
 
  app.post('/users', (Request req, Response res) async {
    final schema = z.map({
        'name': z.string().min(3).nullable(),
        'age': z.int().min(1).nullable(),
    });
 
    try {
        final data = await schema.parseAsync(req.body);
 
        return res.json(data);
    } catch (e) {
        return res.status(406).send(schema.getErrors());
    }
  });
 
  app.listen(3000, () {
    print('Server is running!');
  });
}

(Extra Package) Zard Darto Middleware

Validation middleware for Darto using Zard. Inspired by the zod-express-middleware package from the Node.js ecosystem, bringing a similar validation experience to Dart/Flutter servers. Look a package called zard-darto-middleware for more information.


app.post(
  '/users',
  validateRequestBody(z.map({
  'name': z.string().min(3),
  'email': z.string().email(),
  'age': z.int().min(18),
})),
  (Request req, Response res) {
    final body = req.$body; // Acccess validated body
 
    return res.json({'data': body});
  },
);