uniq-ish

Creates unique ids by generating a string of random characters of specified length.

For example:

console.log(randomId(2)) // 'Aa'  
console.log(randomId(10)) // '09aRq3zzy3'

Custom Validator

A validator function can be passed as a parameter to specify which output values cannot be emitted (very useful for ensuring uniqueness in a domain)

For example, to require your id have at least one 'a':

let r = randomId(5, id => id.indexOf('a'>= 0))

If the function fails after 100 attempts to produce a result it lengthens the number:

let iReallyWantThreeChars = id => id.length > 2
console.log(randomId(2, iReallyWantThreeChars)) ==> a0x, xb1, bb3, 000, ...  

Custom Character Set

By default characters are generated from the base62 set (a-zA-Z0-9).

You can pass your own character set instead, as a string of any length.

For example, to generate a random string of 10 'ABC#@' characters:

console.log(randomId(10,null,'ABCD##')) // @B#DD#@ABC