Use Asynchronous Blur Validation while a Form is being Filled out using redux-form

During the user’s process of inputting, we can make an API call to present information to a user even before the form has been submitted. This can be useful because it means the user can find out about the validity of their information without filling out the entire form first. For example, we can tell the user whether or not their desired username is available immediately after they input it.