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# @lukeed/csprng  [](https://codecov.io/gh/lukeed/csprng)
> A tiny (~90B) isomorphic wrapper for `crypto.randomBytes` in Node.js and browsers.
***Why?***
This package allows you/dependents to import a cryptographically secure generator (CSPRNG) _without_ worrying about (aka, checking the runtime environment for) the different `crypto` implementations. Instead, by extracting a `random` function into a third-party/external package, one can rely on bundlers and/or module resolution to load the correct implementation for the desired environment.
In other words, one can include the browser-specific implementation when bundling for the browser, completely ignoring the Node.js code – or vice versa.
By default, this module is set up to work with Rollup, webpack, and Node's native ESM _and_ CommonJS path resolutions.
## Install
```
$ npm install --save @lukeed/csprng
```
## Usage
***General Usage***
```js
// Rely on bundlers/environment detection
import { random } from '@lukeed/csprng';
const array = random(12);
// browser => Uint8Array(12) [...]
// Node.js => <Buffer ...>
```
***Specific Environment***
```js
// Choose the "browser" implementation explicitly.
//=> ! NOTE ! Will break in Node.js environments!
import { random } from '@lukeed/csprng/browser';
const array = random(1024);
//=> Uint8Array(1024) [...]
// ---
// Choose the "node" implementation explicitly.
//=> ! NOTE ! Will break in browser environments!
import { random } from '@lukeed/csprng/node';
const array = random(1024);
//=> <Buffer ...>
```
## API
### random(length)
Returns: `Buffer` or `Uint8Array`
Returns a typed array of given `length`.
#### length
Type: `Number`
The desired length of your output TypedArray.
## Related
- [uid](https://github.com/lukeed/uid) - A tiny (134B) and fast utility to randomize unique IDs of fixed length
- [@lukeed/uuid](https://github.com/lukeed/uuid) - A tiny (230B), fast, and cryptographically secure UUID (V4) generator for Node and the browser
## License
MIT © [Luke Edwards](https://lukeed.com)