OvO

OvO is a Dart-first schema declaration and validation library.

Introduction

OvO is a Dart-first schema declaration and validation library. We use the technical term "Schema" to define any data type, from simple single data (for example: string/int, etc.) to complex nested Map.

OvO is designed to be as user-friendly and developer-friendly as possible, with the goal of eliminating tedious type checking and object deserialization. It is easy to compose complex data structure validation using simple declaration validation.

several important aspects

• A fun walkthrough of Dart type extensions
• Simple and chained interface calls
• Can be used on any Dart platform (Dart, Web, Flutter)

Installation

We are more aggressive and use higher versions of Dart stable versions as much as possible.

Install from command line

dart pub add ovo

Install from pubspec.yaml

dependencies:
  ovo: latest

Basic Usage

Create a simple string schema:

import 'package:ovo/ovo.dart' as ovo;

// Create a schema for string.
final schema = ovo.string();

// Parsing
await schema.parse('Hello World'); // => 'Hello World'
await schema.parse(123); // => throws OvoError

// Safe parsing, don't throw error.
await schema.safeParse('Hello World'); // => OvoSuccess<String>('Hello World')
await schema.safeParse(123); // => OvoFailure<String>('Expected a string, but received a int')

Creating an JSON schema:

import 'package:ovo/ovo.dart' as ovo;

final schema = ovo.json({
    'name': ovo.string(),
});

await schema.parse({
    'name': 'John',
}); // => {'name': 'John'}