JSPM

Check if the parameter is null

JSON isNull method

A utility function to fix and extend the built-in ''typeof'' operator of JavaScript.

A base class implementing basic value validators. E.g: isDefined, isNumber, etc... More validators to be added soon (isEmpty, isNull, isGreaterThan, isLessThan, isBoolean, isArray, etc...)

JavaScript library to check data types

A small set of functions to check value against a specific type