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_The default is \"non-secure\", which uses `Math.random` to produce UUIDs._\n* [`@lukeed/uuid/secure`](#lukeeduuidsecure)
_The \"secure\" mode produces cryptographically secure (CSPRNG) UUIDs using the current environment's `crypto` module._\n\n> **Important:**
Version `1.0.0` only offered a \"secure\" implementation.
In `v2.0.0`, this is now exported as the `\"@lukeed/uuid/secure\"` entry.\n\nAdditionally, this module is preconfigured for native ESM support in Node.js with fallback to CommonJS. It will also work with any Rollup and webpack configuration.\n\n\n## Install\n\n```\n$ npm install --save @lukeed/uuid\n```\n\n## Modes\n\nThere are two \"versions\" of `@lukeed/uuid` available:\n\n#### `@lukeed/uuid`\n> **Size (gzip):** 231 bytes
\n> **Availability:** [CommonJS](https://unpkg.com/@lukeed/uuid/dist/index.js), [ES Module](https://unpkg.com/@lukeed/uuid/dist/index.mjs), [UMD](https://unpkg.com/@lukeed/uuid/dist/index.min.js)\n\nRelies on `Math.random`, which means that, while faster, this mode **is not** cryptographically secure.
Works in Node.js and all browsers.\n\n#### `@lukeed/uuid/secure`\n> **Size (gzip):** 235 bytes
\n> **Availability:** [CommonJS](https://unpkg.com/@lukeed/uuid/secure/index.js), [ES Module](https://unpkg.com/@lukeed/uuid/secure/index.mjs), [UMD](https://unpkg.com/@lukeed/uuid/secure/index.min.js)\n\nRelies on the environment's `crypto` module in order to produce cryptographically secure (CSPRNG) values.
Works in all versions of Node.js. Works in all browsers with [`crypto.getRandomValues()` support](https://caniuse.com/#feat=getrandomvalues).\n\n\n## Usage\n\n```js\nimport { v4 as uuid } from '@lukeed/uuid';\nimport { v4 as secure } from '@lukeed/uuid/secure';\n\nuuid(); //=> '400fa120-5e9f-411e-94bd-2a23f6695704'\nuuid(); //=> 'cd6ffb4d-2eda-4c84-aef5-71eb360ac8c5'\n\nsecure(); //=> '8641f70e-8112-4168-9d81-d38170bfa612'\nsecure(); //=> 'd175fabc-2a4d-475f-be56-29ba8104c2f2'\n```\n\n\n## API\n\n### uuid.v4()\nReturns: `string`\n\nCreates a new Version 4 (random) [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUID.\n\n\n## Benchmarks\n\n> Running on Node.js v12.18.4\n\n```\nValidation:\n ✔ String.replace(Math.random)\n ✔ String.replace(crypto)\n ✔ uuid/v4\n ✔ @lukeed/uuid\n ✔ @lukeed/uuid/secure\n\nBenchmark:\n String.replace(Math.random) x 381,358 ops/sec ±0.31% (93 runs sampled)\n String.replace(crypto) x 15,842 ops/sec ±1.16% (86 runs sampled)\n uuid/v4 x 1,259,600 ops/sec ±0.45% (91 runs sampled)\n @lukeed/uuid x 6,384,840 ops/sec ±0.22% (95 runs sampled)\n @lukeed/uuid/secure x 5,439,096 ops/sec ±0.23% (98 runs sampled)\n```\n\n> Running on Chrome v85.0.4183.121\n\n```\nValidation:\n ✔ String.replace(Math.random)\n ✔ uuid/v4\n ✔ @lukeed/uuid\n ✔ @lukeed/uuid/secure\n\nBenchmark:\n String.replace(Math.random) x 313,213 ops/sec ±0.58% (65 runs sampled)\n uuid/v4 x 302,914 ops/sec ±0.94% (64 runs sampled)\n @lukeed/uuid x 5,881,761 ops/sec ±1.29% (62 runs sampled)\n @lukeed/uuid/secure x 852,939 ops/sec ±0.88% (65 runs sampled)\n```\n\n## Performance\n\nThe reason why this UUID.V4 implementation is so much faster is two-fold:\n\n1) It composes an output with hexadecimal pairs (from a cached dictionary) instead of single characters.\n2) It allocates a larger Buffer/ArrayBuffer up front (expensive) and slices off chunks as needed (cheap).\n\nThe `@lukeed/uuid/secure` module maintains an internal ArrayBuffer of 4096 bytes, which supplies **256** `uuid.v4()` invocations. However, the default module preallocates **256** invocations using less memory upfront. Both implementations will regenerate its internal allocation as needed.\n\nA larger buffer would result in higher performance over time, but I found this to be a good balance of performance and memory space.\n\n## License\n\nMIT © [Luke Edwards](https://lukeed.com)","users":{}}