Introduction

What is Decoval?

Decoval is a decorator-driven validation pattern that allows you to add validation rules directly to the properties of TypeScript classes, simplifying data control and increasing code readability and reusability.

• Clean syntax: rules as notes, easy to read.
• Separation of concerns: validation in the model, not in the logic.
• Reusable: Easy to create and apply custom validators.
• Scalable: ideal for projects with lots of data and rules.

Try It Out

This example uses Decoval decorators to validate a User model with strict input rules: username requires a number and no spaces, password needs a special character and no spaces, and status must be a boolean. Ideal for secure login or account creation flows.

import { DvText, DvBoolean, decoValidation } from "decoval";
 
class User {
  @DvText({ noSpaces: true, number: true })
  username!: string;
 
  @DvText({ emailProviders: ["gmail.com", "yandex.com"] })
  email!: string;
 
  @DvText({ noSpaces: true, specialChar: true })
  password!: string;
 
  @DvBoolean()
  status!: boolean;
}
 
const user = new User();
user.username = "alberto2003";
user.email = "next@gmail.com";
user.password = "nextjs@google";
user.status = true;
 
decoValidation(user).then(console.log).catch(console.log);

What Makes Decoval Different?

Decoval offers a modern and elegant approach to data validation with decorators. With clean syntax, native TypeScript integration, support for country-specific validations, and ease of creating custom validators, it combines organization, scalability, and flexibility. Without relying on external schemas or heavy libraries, Decoval is ideal for APIs, web applications, and enterprise systems that require clear, reusable, and model-centric rules.

Main Features

Decoval is designed to provide a streamlined and powerful solution for data validation, ensuring maintainability, flexibility, and scalability. Here’s what makes it stand out:

Decoval vs Class Validator

A basic comparison between Decoval and Class Validator, focusing on simplicity, performance, and developer experience when working with data validation using decorators in TypeScript.

Feature Comparison