How to use built-in validators in Angular
Łukasz Holeczek
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Using Angular built-in validators provides robust form validation with minimal code, ensuring data quality and user experience consistency. As the creator of CoreUI with over 11 years of Angular development experience, I’ve implemented form validation extensively in enterprise applications and component libraries. From my expertise, the most effective approach is using Angular’s built-in validators with reactive forms for comprehensive validation coverage. These validators handle common validation scenarios while providing clear error feedback and accessibility support.
Use Angular built-in validators like Validators.required, Validators.email, and Validators.pattern with reactive forms.
import { FormBuilder, Validators } from '@angular/forms'
ngOnInit() {
this.userForm = this.fb.group({
email: ['', [Validators.required, Validators.email]],
age: ['', [Validators.required, Validators.min(18), Validators.max(120)]],
phone: ['', [Validators.required, Validators.pattern(/^\d{10}$/)]]
})
}
Here Validators.required ensures the field has a value, Validators.email validates email format, Validators.min(18) and Validators.max(120) set numeric range limits, and Validators.pattern(/^\d{10}$/) enforces a 10-digit phone number format. Multiple validators are combined in arrays, and validation runs automatically on user input. Access validation errors with userForm.get('email')?.errors to display appropriate error messages in the template.
Best Practice Note:
This is the same approach we use in CoreUI Angular components for consistent form validation across enterprise applications. Combine built-in validators with custom validators for comprehensive validation coverage, and always provide clear error messages for better user experience.
