Nodejs generate short unique alphanumeric

Question

I would like to generate a short unique alphanumeric value to be used as confirmation codes for online purchases. I\'ve looking into https://github.com/broofa/node-uuid but the

Answer 1

IF each online purchase associated to Unique URL , you can use the backend of simple-short package,which don't require database connection, nor web services :

var shorten=require('simple-short');

shorten.conf({length:8}); // Default is 4. 

code1=shorten('http://store.com/purchase1');
code2=shorten('http://store.com/purchase2');
 //.. so on