Get all validation errors for Angular FormGroup, FormRecord, or FormArray

get-form-validation-errors.ts

import { 
  FormGroup,
  FormRecord,
  FormArray,
  ValidationErrors 
} from '@angular/forms';

export function getFormValidationErrors(form: FormGroup|FormRecord|FormArray, path ?: string = '$') {

  const result = [];
  const formErrors: (ValidationErrors|null|undefined) = form.errors;
  if (formErrors) {
     Object.entries(formErrors).forEach( ([keyError, message]) => {
        result.push({
          'control': 'form',
          'error': keyError,
          'value': message,
          'path': path
        });
      });
  }
  if (form instanceof FormArray) {
    form.controls.forEach( ([control, index]) => {
      if (control instanceof FormGroup || control instanceof FormRecord || control instanceof FormArray) {
        result.push(...getFormValidationErrors(control, `${path}.[${index}]`))
      } else {
        const controlErrors: (ValidationErrors|null|undefined) = control.errors;
        if (controlErrors) {
          Object.entries(controlErrors).forEach( ([keyError, message]) => {
            result.push({
              'control': key,
              'error': keyError,
              'value': message,
              'path': `${path}.[${index}].${key}`
            });
          });
        }
      }
    });
  } else {
    Object.entries(form.controls).forEach( ([key, control]) => {
      if (control instanceof FormGroup || control instanceof FormRecord || control instanceof FormArray) {
        result.push(...getFormValidationErrors(control, `${path}.${key}`))
      } else {
        const controlErrors: (ValidationErrors|null|undefined) = control.errors;
        if (controlErrors) {
          Object.entries(controlErrors).forEach( ([keyError, message]) => {
            result.push({
              'control': key,
              'error': keyError,
              'value': message,
              'path': `${path}.${key}`
            });
          });
        }
      }
    });
  }
  return result;
}

Switching from Object.keys to Object.entries and adding recursion for nested forms.

Added form-level validation errors

Added JSONPath path, in case the recursion gets deep.