Existence Packages

Checks existence of email addresses

Checks existence of E-Mail DNS MX records.

Check for the existential value of a variable. Assign value by default.

The missing existential operator for JavaScript. Returns true unless a variable is null or undefined

Check whether an email address exists.

Stimulus controller to remove elements from the dom, and be notified with an event when they are added.

A monadic wrapper for dealing with existence

A library written in Typescript which tries to check if an email address really exists

Check if an SMTP server accepts emails to a given address.

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

Tests whether a path exists on the filesystem.

Verify email address by checking MX records and SMTP connection.

Validate that referenced documents exist in Mongoose.

API Client for Proof of Existence

Checks existence of email addresses

All things created by God

Methods which simplify checking whether or not AWS resources exist.

Check if a GitHub repo exists

CLI to Check if a GitHub repo exists

AWS Infrastructure as Code with Node.js