Why NanoID Is Replacing UUID: Features, Advantages, and Limitations

Understanding NanoID and Its Usage

For JavaScript, generating UUID or NanoID is straightforward thanks to dedicated NPM packages. Install the NanoID library with npm i nanoid and import it:

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

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

NanoID is roughly seven years younger than UUID and already has more GitHub stars. NPM trend graphs show a sharp rise for NanoID compared to the flat progress of UUID.

1. NanoID Is Only 108 Bytes Large

NanoID is about 4.5 times smaller than UUID and has no external dependencies, reducing bundle size by roughly 35%.

The reduced size directly impacts data transfer and storage, making a noticeable difference as applications scale.

2. More Secure

Many random generators rely on the insecure Math.random() . NanoID, however, uses the crypto module and the Web Crypto API, providing stronger security.

It also employs a uniform algorithm instead of a simple random % alphabet approach.

3. Fast and Compact

NanoID is 60% faster than UUID and uses only 21 characters instead of UUID’s 36.

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz-

It supports 14 programming languages, including C#, Go, Rust, Swift, and more.

4. Compatibility

NanoID works with libraries such as PouchDB, CouchDB, WebWorkers, Rollup, React, and React‑Native. You can generate an ID directly in the terminal with npx nanoid .

5. Custom Alphabet

Developers can define a custom alphabet and ID length:

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

In this example the alphabet is ABCDEF1234567890 and the ID length is 12.

6. No Third‑Party Dependencies

Because NanoID has no external dependencies, it remains stable and autonomous over time, keeping bundle size low and avoiding dependency‑related issues.

Limitations and Future Focus

Experts note that NanoID’s main drawback is reduced human readability, which can make debugging harder, though it is still shorter than UUID.

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

Looking Ahead

NanoID is becoming the most popular unique‑ID generator in the JavaScript ecosystem, with many developers preferring it over UUID.

"Using the default alphabet, NanoID can generate over 2.2 million IDs per second; with a custom alphabet, over 1.8 million per second."

Based on personal experience, the author recommends NanoID for future projects due to its compact size, URL‑friendliness, security, and speed.