React Formik : how to use custom onChange and onBlur

You’ll need to remove the first handleBlur from Formik as blur event is only valid on the field level and do something like the following in your Field element:

<Field
    component={MyInput}
    name="email"
    type="email"
    onBlur={e => {
        // call the built-in handleBur
        handleBlur(e)
        // and do something about e
        let someValue = e.currentTarget.value
        ...
    }}
/>

See https://github.com/jaredpalmer/formik/issues/157