$ npm install node-code-generator
var CodeGenerator = require('node-code-generator');
var generator = new CodeGenerator();
var pattern = 'ABC#+';
var howMany = 100;
var options = {};
// Generate an array of random unique codes according to the provided pattern:
var codes = generator.generateCodes(pattern, howMany, options);
In the pattern, the following characters are replaced:
#
with a single numeric character*
with a single alphanumeric character (excluding ambiguous letters and numbers)#+
with a variable number of numeric characters (the number of characters depends on how many codes we need to generate and on the sparsity option)*+
with a variable number of alphanumeric characters (the number of characters depends on how many codes we need to generate and on the sparsity option)
Name | Default | Description |
---|---|---|
sparsity |
1 |
How sparse should the generated set be? The default setting generates a dense set, but probably if you are generating vouchers you want to provide an higer number to avoid consecutive (guessable) codes |
existingCodesLoader |
function(pattern) { return []; } |
Provide a function that returns an array of previously generated codes for this pattern to avoid duplicates |
alphanumericChars |
123456789ABCDEFGHJKLMNPQRSTUVWXYZ |
Characters that will be substituted to * |
numericChars |
0123456789 |
Characters that will be substituted to # |
alphanumericRegex |
/\*(?!\+)/g |
Regular expression to match * |
numericRegex |
/#(?!\+)/g |
Regular expression to match # |
alphanumericMoreRegex |
/\*\+/g |
Regular expression to match *+ |
numericMoreRegex |
/#\+/g |
Regular expression to match #+ |
The library also exposes the simple randomChars(allowedChars, howMany)
function to simply generate random strings (based on Math.random(), so don't use it where security matters!
Fork -> Branch -> Pull request!
MIT (see LICENSE)