How can I customize Formik components in my React app?

How can I customize Formik components in my React app?

You can customize Formik components by using the Field component and passing custom props or using render props.

Can you give me an example of a custom input component?

Sure! You can create a custom input like this:

const CustomInput = ({ field, form, ...props }) => {
  return <input {...field} {...props} />;
};

Then use it in Formik like this:

<Field name="username" component={CustomInput} />

What about validation for the custom component?

You can handle validation by using Formik's validate prop or by integrating with a validation library like Yup.

How do I integrate Yup for validation?

You can integrate Yup by defining a validation schema and passing it to Formik like this:

import * as Yup from 'yup';

const validationSchema = Yup.object().shape({
  username: Yup.string().required('Username is required'),
});

<Formik
  validationSchema={validationSchema}
  ...
/>