Light ECMAScript (JavaScript) Value Notation

 Levn is a library which allows you to parse a string into a JavaScript value
 based on an expected type. It is meant for short amounts of human entered data
 (eg. config files, command line arguments).
 .
 Levn aims to concisely describe JavaScript values in text, and allow for the
 extraction and validation of those values. Levn uses 'type-check' for its type
 format, and to validate the results.
 .
 How is this different than JSON? levn is meant to be written by humans only,
 is (due to the previous point) much more concise, can be validated against
 supplied types, has regex and date literals, and can easily be extended with
 custom types. On the other hand, it is probably slower and thus less efficient
 at transporting large amounts of data, which is fine since this is not its
 purpose.
 .
 Node.js is an event-based server-side JavaScript engine.