Formik isValid not working

1. How do I know if my Formik has errors?
2. How do you validate a form in react using Formik?
3. What is the use of Yup in react?

How do I know if my Formik has errors?

Checking for Errors

The way that Formik handles errors is that the returned error structure should map an error message to same structure as your values. In our case we have a single level object with a firstName key. So if our value below is set like this, then our error should map accordingly.

How do you validate a form in react using Formik?

import React from 'react'; import useFormik from 'formik'; const SignupForm = () => // Pass the useFormik() hook initial form values and a submit function that will // be called when the form is submitted const formik = useFormik( initialValues: email: '', , onSubmit: values => alert(JSON.

What is the use of Yup in react?

Yup is a JavaScript schema builder for value parsing and validation. Define a schema, transform a value to match, validate the shape of an existing value, or both. Yup schema is extremely expressive and allows modelling complex, interdependent validations, or value transformations.