Add Custom Server-Side Validation to Your Forms in WordPress

Perform your own server-side validation for submitted field values for forms in WordPress.

  • Server-side validation Perform your own validation of submitted field values.
  • Custom validation logic Add your own validation behavior for form submissions.
  • Field value validation Validate submitted field values on the server side.
  • WordPress filter hook Use the wsf_submit_field_validate filter hook.
  • Developer-friendly Built for custom validation implementations.
  • Examples available See the knowledge base article for descriptions and examples.

WS Form allows you to perform your own server-side validation of submitted field values.

For WordPress developers who need custom validation behavior, WS Form provides the wsf_submit_field_validate filter hook.

You can use that hook to add your own server-side form validation logic. Full descriptions and examples are available in the knowledge base article.

  • Validate on the server

    Perform validation of submitted field values with server-side logic.

  • Add your own rules

    Create your own validation behavior instead of relying only on default checks.

  • Use a filter hook

    WS Form provides the wsf_submit_field_validate WordPress filter hook for this feature.

  • Target submitted values

    Apply validation to the values submitted through your form fields.

  • Built for customization

    This feature supports custom validation implementations in WordPress.

  • Developer-focused control

    Use code-based validation when you need custom server-side checks.

  • Documentation included

    A dedicated knowledge base article covers this validation approach.

  • Examples to follow

    The knowledge base article includes examples for implementing custom server-side form validation.

Real Customer Reviews

Trusted by thousands of WordPress professionals.

  • It does an awesome job with a lot of features, from simple contact forms up to really complex forms for post management and user management. The support is awesome.

    piguinweb
  • Not only is the form plugin incredibly powerful and flexible – but it also comes with the best support in the industry!

  • I have been using WordPress since 2006. I’ve used hundreds of different plugins, including many of the popular (and not so popular) form plugins. Gravity forms is great. WS Form is better.

    thinkgobig

Frequently Asked Questions

Can WS Form perform custom server-side validation?

Yes. WS Form allows you to perform your own server-side validation of submitted field values.

What can I validate with this feature?

You can validate submitted field values on the server side.

How is custom server-side validation implemented in WS Form?

WS Form provides the wsf_submit_field_validate WordPress filter hook for custom server-side validation.

Is there a hook for server-side field validation?

Yes. The hook referenced for this feature is wsf_submit_field_validate.

How do I add custom server-side validation in WS Form?

Use the wsf_submit_field_validate filter hook. For a full description and examples, see the knowledge base article.