npm i encoding2decoding
const e2d = require('encoding2decoding');
e2d.encode('abc'); // Returns 101112
const { decode } = require('encoding2decoding');
e2d.decode('101112'); // Returns abc
This is similar to Micah Lindley's 'String2Num' however removes lots of the complication. Case sensitive not supported. Extremely leightweight, simple, and has zero dependencies.