js-nuid

JS NUID

A highly performant unique identifier generator.

Installation

Use the npm command:

$ npm install js-nuid

Basic Usage

<script src="../index.js"></script>

<script>
    n = new nuid.Nuid();
    for (let i = 0; i < 10; i++) {
        let pre = document.createElement("pre");
        let t = document.createTextNode(n.next());
        pre.appendChild(t);
        document.body.appendChild(pre);
    }
</script>

Performance

NUID needs to be very fast to generate and be truly unique, all while being entropy pool friendly. NUID uses 12 bytes of crypto generated data (entropy draining), and 10 bytes of pseudo-random sequential data that increments with a pseudo-random increment.

Total length of a NUID string is 22 bytes of base 36 ascii text, so 36^22 or 17324272922341479351919144385642496 possibilities.

Supported Browsers

The library uses crypto to generate random numbers. Current support for crypto can be found here: https://caniuse.com/#search=crypto.

If you want to target other browsers, you can shim an implementation of crypto.getRandomValues() such as the one below. However your performance and entropy will vary.

window.crypto.getRandomValues = function(array) {
    for(let i=0; i < array.length; i++) {
        array[i] = Math.floor(Math.random() * (255));
    }
};

Supported Node Versions

Our support policy for Nodejs versions follows Nodejs release support. We will support and build node-nats on even-numbered Nodejs versions that are current or in LTS.

License

Unless otherwise noted, the NATS source files are distributed under the Apache Version 2.0 license found in the LICENSE file.