How about a small usage example?

[Aditya94A]

The readme doesn't say much. I had to look up the format of the json file to find out that I have to loop over it and check if email.includes(arrayItem).

Since it is a library, perhaps adding a small helper method would be a good idea?

[filiptronicek]

I think this is a good idea, upon looking around the web I found this could help:

function validateEmailNotDisposable(mailHost) {
    fetch(`https://open.kickbox.com/v1/disposable/${mailHost}`)
      .then(response => response.json())
      .then(obj => obj.disposable && alert("Not valid!"))
}

[karlhorky]

Also added one in this PR:

• Add ESM and demo code #964