Check for the existential value of a variable. Assign value by default.
Checks existence of E-Mail DNS MX records.
A variable lives here
Check if a value exists at a nested property path
Check for the existential value of a variable/object. Assign one if the value doesn't exist.
A monadic wrapper for dealing with existence
All things created by God
API Client for Proof of Existence
CLI util for Proof of Existence
Check if an SMTP server accepts emails to a given address.
Tests whether a path exists on the filesystem.
A library written in Typescript which tries to check if an email address really exists
run useful tests on your arrays or hashes of arrays or hashes
Verify email address by checking MX records and SMTP connection.
Check if a GitHub repo exists
Check whether an email address exists.