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T4cC0re/uuid4.js

Created June 19, 2016 14:17
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Generate a valid UUID v4 using nodejs' CSPRNG
Raw
uuid4.js
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
.replace(
/[xy]/g,
char => {
const rnd = parseInt(
require('crypto')
.randomBytes(1) // get one byte
.toString('hex')// encode it to hex
.slice(0, 1), // slice to one char
16
); //parse int (ranges from 0-15)
// mask y value and return as hex
return ((char == 'x') ? rnd : (rnd & 0x3 | 0x8)).toString(16);
}
);
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