Forms and Data

Form Validation in React

Validate user input with field-level and schema-based strategies for robust form workflows.

Validation approaches

Field-level validation (on change/blur)
Form-level validation (before submit)
Schema-based validation (Zod, Yup)

Simple validation example

tsx

const errors: string[] = [];
if (!email.includes('@')) errors.push('Email is invalid');
if (password.length < 8) errors.push('Password must be at least 8 characters');

React Hook Form with Zod (common stack)

Minimal re-renders
Strong TypeScript support
Scalable for complex forms

UX best practices

Show clear inline error messages
Validate early but not aggressively
Disable submit when invalid (where appropriate)

Next, we will integrate APIs.

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