Parseus is a javascript library written in Typescript which allow marshall/unmarshall JSON into class instance. This library is able to run in NodeJS, Typescript or any JS platform. API Docs

Usage Javascript (ESNEXT)

class Person {
  @Field({ type: 'string', name: 'person_name' })
  name

  @Field({ readOnly: true, name: 'person_age', type: 'number' })
  age

  @Field({ name: 'person_last_name', type: 'string' })
  lastName

  @Field({ name: 'person_gender', default: 'M', type: 'string' })
  gender

  @Field({ name: 'person_created_at', type: 'date' })
  createdAt
}

const data = {
  person_name: 'Jhon',
  person_last_name: 'Smith',
  person_age: 25,
  person_created_at: '2018-01-01T12:00:00.000Z'
}
/**
 *  Returns an instance of Person like
 * {
 *   name:'Jhon',
 *   lastName: 'Smith',
 *   age: 25,
 *   gender: 'M',
 *   createdAt: Mon Jan 01 2018 08:00:00 GMT-0400 (Atlantic Standard Time) {}
 * }
 **/

const person = Parseus.decode(data).to(Person)
person.gender = 'F'
person.age = 18
person.name = 'Sara'

/**
 * The second parameter is optional, but if
 * the class instance has been mutated
 * we should pass the original class for references
 *
 * Returns an object with the next structure { [key:string]: any }
 * {
 *   "person_name": "Sara",
 *   "person_last_name": "Smith",
 *   "person_age": 18,
 *   "person_gender": F,
 *   "person_created_at": "2018-01-01T12:00:00.000Z"
 * }
 **/
const personMarshalled = Parseus.encode(person, Person)

Usage Typescript

class Person {
  @Field({ type: 'string', name: 'person_name' })
  name?: string

  @Field({ readOnly: true, name: 'person_age' })
  age?: number

  @Field({ name: 'person_last_name' })
  lastName?: string

  @Field({ name: 'person_gender', default: 'M' })
  gender?: string

  @Field({ name: 'person_created_at', type: 'date' })
  createdAt?: Date
}

const data = {
  person_name: 'Jhon',
  person_last_name: 'Smith',
  person_age: 25,
  person_created_at: '2018-01-01T12:00:00.000Z'
}
/**
 *  Returns an instance of Person like
 * {
 *   name:'Jhon',
 *   lastName: 'Smith',
 *   age: 25,
 *   gender: 'M',
 *   createdAt: Mon Jan 01 2018 08:00:00 GMT-0400 (Atlantic Standard Time) {}
 * }
 **/

const person = Parseus.decode(data).to(Person)
person.gender = 'F'
person.age = 18
person.name = 'Sara'

/**
 * The second parameter is optional, but if
 * the class instance has been mutated
 * we should pass the original class for references
 *
 * Returns an object with the next structure { [key:string]: any }
 * {
 *   "person_name": "Sara",
 *   "person_last_name": "Smith",
 *   "person_age": 18,
 *   "person_gender": F,
 *   "person_created_at": "2018-01-01T12:00:00.000Z"
 * }
 **/
const personMarshalled = Parseus.encode(person, Person)

1. Install the npm package:

   npm install parseus --save or using yarn yarn add parseus

2. You need to install reflect-metadata shim:

   npm install reflect-metadata --save or using yarn yarn add reflect-metadata

   and import it somewhere in the global place of your app:

   import 'reflect-metadata'

| Property | Description | Type | Default | | ----------- | ---------------------------------------------------------------------------------------------------------------------- | ------------ | -------- | | type | Field type. Must be one of the values from the FieldType | string | 'string' | | name | Key name in source object. if this value is not provided it takes the model field's name wrapped | string | - | | isVirtual | Indicates if field's value is ignored when marshall Object | boolean | false | | default | Indicates the initial field's value | any | - | | readOnly | Indicates if field's value is read only (freeze) | boolean | false | | fixed | The scale for a decimal (exact numeric) field, which represents the number of digits to the right of the decimal point | number | 6 | | transformer | Specifies a value transformer that is to be used to (un)marshall the current field when (un)marshall | ITransformer | - | | factory | Indicates the field's model class of target | class | - |

| Property | Description | Type | Default | | -------- | ---------------------------------------------------- | -------- | ------- | | to | Used to marshall data when writing to the new object | Function | - | | from | Used to unmarshall data when reading from object | Function | - |

| Property | Description | Type | Default | | -------- | ----------------------------- | ------------- | ------- | | key | key name in source object | string | - | | options | Field type options field's | IFieldOptions | - | | data | complete mapped source object | object | - |

Still in progress...