How to Use Custom Validation Patterns

Validation helps catch missing or invalid responses before a document is saved. It should guide the user rather than block them with an unclear message.

Practical procedure

1. 1. Mark a field required only when essential.
2. 2. Add length or range limits.
3. 3. Write a specific error message.
4. 4. Test valid and invalid values.
5. 5. Provide an alternative for unusual cases.

Common mistakes

In practice, the most common issues are: too many required fields, ambiguous labels, no test with a real document, relying on color alone, saving data without an explicit user decision. Each can be caught before publishing by using the preview and form checker.

Final review

• Does every field have a label?
• Are technical field names unique?
• Can the form be completed with a keyboard?
• Do error messages explain how to fix the issue?
• Was the selected export opened and checked?

Formularz.podziel.pl lets you design the entire project locally, check it and export it without creating an account.

Open the form builder