Check if a string is an IP address
MIT License
Check if a string matches the name of a Node.js builtin module
Check if a URL is relative
Check if servers are reachable
Check whether a website is up or down
Regular expression for matching IP addresses
Get your public IP address - very fast!
Check if the internet connection is up
Get your public IP address
Check if a local or remote port is reachable
Check if a string is HTML
Check if a string is a valid JavaScript identifier
Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc
Check if a string is a URL
Get your internal IP address