Base UI Forms and Validation

Use this skill for Field, Fieldset, Form, and input family behavior.

Covered set

• Field, Fieldset, Form
• Input, Checkbox, Checkbox Group
• Number Field, Slider, Radio
• Switch, Toggle, Toggle Group

Routing cues

• "validation", "errors", "Field.Root", "validationMode", "onFormSubmit", "control", "label/description/error", "form state" → this skill

Source index

• https://base-ui.com/react/handbook/forms
• Component pages for each form family under https://base-ui.com/llms.txt

Maintenance

• Snapshot date: 2026-02-13
• Refresh cadence: quarterly
• Upstream changelog anchor: https://github.com/mui/base-ui/blob/master/CHANGELOG.md

References

• Forms patterns
• API and wrapper notes