A simple schema/attributes library built on top of modern JavaScript

Structure provides a simple interface which allows you to add attributes to your ES6 classes based on a schema, with validations and type coercion.

Use cases

You can use Structure for a lot of different cases, including:

  • Domain entities and value objects

  • Model business rules

  • Validation and coercion of request data

  • Map pure objects and JSON to your application classes

  • Add attributes to classes that you can't change the class hierarchy

What Structure is not:

  • It's not a database abstraction

  • It's not a Model of a MVC framework

  • It's not an attempt to simulate classic inheritance in JavaScript

Example usage

For each attribute on your schema, a getter and a setter will be created into the given class. It'll also auto-assign those attributes passed to the constructor.

const { attributes } = require('structure');

const User = attributes({
  name: String,
  age: {
    type: Number,
    default: 18,
  birthday: Date,
  class User {
    greet() {
      return `Hello ${}`;

/* The attributes "wraps" the Class, still providing access to its methods: */

const user = new User({
  name: 'John Foo',
});; // 'John Foo'
user.greet(); // 'Hello John Foo'

Last updated