JSPM

Check if a GitHub repo exists

CLI to Check if a GitHub repo exists

Utility functions that emulate CoffeeScript existence operator

A simple wrapper around an object that will warn when you access keys that aren't defined (using the magic of ES6 Proxies)

Checks existence of email addressesi including MX, telnet and regex validation

Test whether a path exists on the filesystem.

A variable lives here

Check whether an email address exists.

API Client for Proof of Existence

Verify email address by checking MX records and SMTP connection.