crpyto.random

uid

A tiny (134B) and fast utility to randomize unique IDs of fixed length

Fast object IDs. Available for Node.js and the browser.
Generate randomized output strings of fixed length using lowercase alphanumeric characters (a-z0-9).

Notice: Please note that this is not a cryptographically secure (CSPRNG) generator.

Additionally, this module is delivered as:

• CommonJS: dist/index.js
• ES Module: dist/index.mjs
• UMD: dist/index.min.js

Install

$ npm install --save uid

Usage

import uid from 'uid';
 
// length = 11 (default)
uid(); //=> 'fsm2vsgo1pr'
uid(); //=> 'gf34sezvoh6'
 
// customize length
uid(16); //=> 'zbb6cc3ay26omrdz'
uid(25); //=> 'lljjmo3f39rnjudsgqvzta1rb'
uid(32); //=> 'yrfiw88qlq1fgpm40lguz6u43gksfj4a'

API

uid(length?)

Returns: String

Creates a new random identifer of fixed length.

length

Type: Number
Default: 11

Then length of the output string.

Important: Your risk of collisions decreases with longer strings!

Benchmarks

Running on Node.js v10.13.0

Validation (length = 11):
  ✔ hashids/fixed        (example: "QWjnegYbwZ1")
  ✔ nanoid/non-secure    (example: "o9SPLfEtDMB")
  ✔ nanoid               (example: "BbgkcjUV8fg")
  ✔ uid                  (example: "5j2t6tmjboz")
Benchmark (length = 11):
  hashids/fixed        x    358,452 ops/sec ±2.04% (95 runs sampled)
  nanoid/non-secure    x  4,855,107 ops/sec ±0.33% (96 runs sampled)
  nanoid               x    493,479 ops/sec ±0.42% (96 runs sampled)
  uid                  x  5,034,240 ops/sec ±0.24% (94 runs sampled)


Validation (length = 25):
  ✔ cuid                 (example: "ck7dod7qj0000ws7c5cmmh5mc")
  ✔ hashids/fixed        (example: "r9JOyLkQWjnegYbwZ1p0GDXNm")
  ✔ nanoid/non-secure    (example: "aIrSCUwGMsMSZ-1xnSB8myg0X")
  ✔ nanoid               (example: "51jS9SkdKG5lXW5Yg3L4juzuT")
  ✔ uid                  (example: "k0gd21k1p2y7qgwmgrgspo4uy")
Benchmark (length = 25):
  cuid                 x    160,075 ops/sec ±1.35% (90 runs sampled)
  hashids/fixed        x    337,598 ops/sec ±0.13% (98 runs sampled)
  nanoid/non-secure    x  2,246,032 ops/sec ±0.31% (96 runs sampled)
  nanoid               x    431,758 ops/sec ±0.71% (98 runs sampled)
  uid                  x  2,417,171 ops/sec ±0.33% (96 runs sampled)


Validation (length = 36):
  ✔ uuid/v1              (example: "e3304870-5e48-11ea-93a8-0d27db144950")
  ✔ uuid/v4              (example: "8f18bfb3-45f9-4c14-b949-87ed98cc41c1")
  ✔ hashids/fixed        (example: "EVq3Pr9JOyLkQWjnegYbwZ1p0GDXNmRBlAxg")
  ✔ @lukeed/uuid         (example: "c47bd63e-7975-47a6-96c2-ea6744c4e0c2")
  ✔ nanoid/non-secure    (example: "4yBHuV2LX1z6uYF2htLIq1dBK-Bqt4r-Il-Q")
  ✔ nanoid               (example: "I01YCalTULD9SorD6lWzDp30hL1_JbULU8UR")
  ✔ uid                  (example: "599tis8bq39vxc95vkfxxr80gwi1mnhuiorz")
Benchmark (length = 36):
  uuid/v1              x  1,485,783 ops/sec ±0.27% (97 runs sampled)
  uuid/v4              x    331,019 ops/sec ±0.86% (91 runs sampled)
  hashids/fixed        x    314,980 ops/sec ±2.07% (96 runs sampled)
  @lukeed/uuid         x  6,355,015 ops/sec ±0.43% (94 runs sampled)
  nanoid/non-secure    x  1,658,583 ops/sec ±0.23% (95 runs sampled)
  nanoid               x    402,224 ops/sec ±0.15% (97 runs sampled)
  uid                  x  1,719,753 ops/sec ±0.24% (95 runs sampled)

Related

• hexoid - A slightly larger (190B) but extremely fast variant of this module with a different API
• @lukeed/uuid - A tiny (230B), fast, and cryptographically secure UUID (V4) generator for Node and the browser

Credits

Thank you Matthew Mueller for gifting the uid name on npm.
This module was previously known as foid (fast object IDs).

License

MIT © Luke Edwards