Why NanoID Is Faster, Smaller, and Safer Than UUID – A Deep Dive

Introduction

UUID is one of the most commonly used universal identifiers in software development, but in recent years alternatives have emerged.

Among them, NanoID is a major competitor to UUID.

This article discusses NanoID's features, highlights, and limitations to help understand when to use it.

Understanding NanoID and Its Usage

For JavaScript, generating UUID or NanoID is straightforward via their respective NPM packages.

Install the NanoID library with npm i nanoid and use it in your project:

import { nanoid } from 'nanoid';
model.id = nanoid();

NanoID receives over 11.75 million weekly NPM downloads and runs about 60% faster than UUID.

It is younger than UUID by about seven years and has more GitHub stars.

The main difference lies in the alphabet used: NanoID uses a larger alphabet, allowing shorter IDs with the same uniqueness as longer UUIDs.

NanoID is only 108 bits

Compared to UUID, NanoID is 4.5 times smaller and has no dependencies, reducing size by about 35%.

Smaller size leads to more compact data transmission and storage, which becomes noticeable as applications scale.

Security

Most random generators rely on insecure Math.random(), but NanoID uses the crypto module and Web Crypto API, making it more secure.

It also employs a uniform algorithm rather than a simple random % alphabet approach.

Performance and Compactness

NanoID is 60% faster than UUID and uses only 21 characters compared to UUID's 36.

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz-

It supports 14 programming languages, including C#, C++, Dart, Go, Java, Python, Rust, Swift, and more.

Compatibility

It works with PouchDB, CouchDB, WebWorkers, Rollup, React, and React Native.

You can generate IDs in the terminal with npx nanoid, provided Node.js is installed.

In Redux Toolkit you can import NanoID directly:

import { nanoid } from '@reduxjs/toolkit';
console.log(nanoid()); // 'dgPXxUz_6fWIQBD8XmiSy'

Custom Alphabet

NanoID allows developers to define a custom alphabet and ID size:

import { customAlphabet } from 'nanoid';
const nanoid = customAlphabet('ABCDEF1234567890', 12);
model.id = nanoid();

No Third‑Party Dependencies

Because NanoID has no external dependencies, it remains stable and its package size stays minimal over time.

Limitations and Future Focus

Experts on StackOverflow note no major drawbacks, though the IDs are less human‑readable, which can hinder debugging.

Using NanoID as a primary key with a clustered index may cause performance issues because the IDs are not sequential.

Looking Ahead

NanoID is becoming the most popular unique‑ID generator in JavaScript, surpassing UUID in many developers' preferences.

Benchmarks show NanoID can generate over 2.2 million IDs per second with the default alphabet and over 1.8 million with a custom alphabet.

Given its small size, URL‑friendliness, security, and speed, the author recommends using NanoID instead of UUID for future projects.

Try NanoID in your next project and share your experience.