Cursor
ui
Form Validation Logic Removed by Cursor
After Cursor refactored your form code, client-side validation was removed. Forms now accept invalid input and submit it to the server, wasting resources and potentially causing errors.
Validation functions or checks were deleted during the refactoring.
Error Messages You Might See
Form submitted with empty fields
Invalid email accepted
No validation errors shown
Server rejects invalid data
Common Causes
- Validation functions deleted as 'dead code'
- Form submit handler no longer calls validate()
- Input onChange handlers not updating validation state
- Validation error messages not displaying
- HTML5 validation attributes removed
How to Fix It
Add validation function: function validate(data) { if (!data.email) return 'Email required'; }. Call on form submit. Show errors: {errors.email && <span>{errors.email}</span>}. Use libraries: react-hook-form, formik. Add HTML5: <input required type='email' />.
Real developers can help you.
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Daniel Vázquez
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Get HelpFrequently Asked Questions
What's the difference between client and server validation?
Client validation is UX (immediate feedback). Server validation is security (trust no client). Always validate both.
What validation library should I use?
react-hook-form for performance, Formik for features, Yup/Zod for schema validation. Choose based on needs.