Check Packages

Returns `true` if the string is upper case only.

Returns `true` if the string is lower case only

Binary wrapper that makes your programs seamlessly available as local dependencies

Drop-in replacement for `fs.existsSync` with zero dependencies. Other libs I found either have crucial differences from fs.existsSync, or unnecessary dependencies. See README.md for more info.

Check if a binary is working

Determine if a filename and/or buffer is text or binary. Smarter detection than the other solutions.

Check if a Buffer/Uint8Array is a PNG image

Returns true if the value passed is all whitespace.

Node.js 0.12 fs.access() & fs.accessSync() ponyfill

Ensure a path doesn't contain null bytes

Check if a Buffer/Uint8Array is a JPEG image

A type checking library where each exported function returns either true or false and does not throw. Also added tests.

A simple Node.js module to check if a TCP port is already bound.

Returns true if a windows file path has invalid characters.

Returns true if a file path does not contain any invalid characters.

find undeclared identifiers and property accesses in a javascript file.

Check if a string is an IP address

Coalesce for JavaScript. Returns the first value that is not undefined or null.

Check if a Buffer/Uint8Array is a GZIP file

Binary wrapper for Flow - A static type checker for JavaScript