formik-yup-react-native

name	formik-yup-react-native
description	Formik + Yup for React Native. TextInput integration, mobile validation UX, error timing. Use when building mobile forms with validation, handling keyboard/focus UX, or wiring Yup schemas to Formik in RN.
kb-sources	["wiki/software-engineering/formik-yup-rn"]
updated	"2026-04-18T00:00:00.000Z"

Formik + Yup for React Native

Form validation for React Native.

When to Use

• Forms with 3+ fields
• Email/password validation
• Mobile error UX
• Keyboard field navigation

Foundation: react-redux-spa-patterns (Formik/Yup basics)

TextInput vs HTML

Critical: TextInput uses onChangeText={handleChange('field')}, not onChange={handleChange}.

Web	React Native
onChange + name attribute	onChangeText + explicit field arg
Auto-submit on Enter	Manual keyboard handling

Error UX Timing

Show When	Why
On Blur	Time to complete input
On Change (after touch)	Immediate correction feedback
On Submit	Catch incomplete

Pattern: {errors.field && touched.field && <Text>{errors.field}</Text>}

Anti-Patterns

Anti-Pattern	Pattern
Manual validation	Use Yup schemas
Errors before touch	Check touched.field first
Duplicate submits	disabled={isSubmitting}
Hidden keyboard inputs	Wrap in KeyboardAvoidingView

reference.md: Field components, keyboard dismissal, async validation, KeyboardAvoidingView setup examples.md: Complete forms, TextInput patterns, Yup schemas, field navigation, real-world code