Get All Angular 2 Form Errors

get_all_erros.ts

  getAllErrors(form: FormGroup | FormArray): { [key: string]: any; } | null {
    let hasError = false

    const result = Object.keys(form.controls).reduce((acc, key) => {
      const control = form.get(key)
      const errors = (control instanceof FormGroup || control instanceof FormArray)
          ? this.getAllErrors(control)
          : control.errors
      if (errors) {
        acc[key] = errors
        hasError = true
      }
      return acc
    }, {} as { [key: string]: any; })

    return hasError ? result : null
  }