angular2 form

main.js

const fields = [
  {
    label: 'First Name',
    name: 'firstName',
    required: true,
    maxLength: 55
  },
  {
    label: 'Last Name',
    name: 'lastName',
    required: true,
    maxLength: 55,
  },
  {
    label: 'Phone',
    name: 'phone',
    required: false,
    maxLength: 10,
  }
]

let group: any = {};

fields.forEach(field => {
  group[field.code] = field.required ? new FormControl('', Validators.required)
                                     : new FormControl('');
});

const registrationGroup = new FormGroup(group);


<form [formGroup]="registrationGroup">
  <input *ngFor="let field of fields" [formControlName]="field.name">
  <div *ngIf="!registrationGroup.get(field.name).valid">
    Field not valid.
  </div>
</form>