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# uid-safe
[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-version-image]][node-version-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]
URL and cookie safe UIDs
Create cryptographically secure UIDs safe for both cookie and URL usage.
This is in contrast to modules such as [rand-token](https://www.npmjs.com/package/rand-token)
and [uid2](https://www.npmjs.com/package/uid2) whose UIDs are actually skewed
due to the use of `%` and unnecessarily truncate the UID.
Use this if you could still use UIDs with `-` and `_` in them.
## Installation
```sh
$ npm install uid-safe
```
## API
```js
var uid = require('uid-safe')
```
### uid(byteLength, callback)
Asynchronously create a UID with a specific byte length. Because `base64`
encoding is used underneath, this is not the string length. For example,
to create a UID of length 24, you want a byte length of 18.
```js
uid(18, function (err, string) {
if (err) throw err
// do something with the string
})
```
### uid(byteLength)
Asynchronously create a UID with a specific byte length and return a
`Promise`.
**Note**: To use promises in Node.js _prior to 0.12_, promises must be
"polyfilled" using `global.Promise = require('bluebird')`.
```js
uid(18).then(function (string) {
// do something with the string
})
```
### uid.sync(byteLength)
A synchronous version of above.
```js
var string = uid.sync(18)
```
## License
[MIT](LICENSE)
[npm-image]: https://img.shields.io/npm/v/uid-safe.svg
[npm-url]: https://npmjs.org/package/uid-safe
[node-version-image]: https://img.shields.io/node/v/uid-safe.svg
[node-version-url]: https://nodejs.org/en/download/
[travis-image]: https://img.shields.io/travis/crypto-utils/uid-safe/master.svg
[travis-url]: https://travis-ci.org/crypto-utils/uid-safe
[coveralls-image]: https://img.shields.io/coveralls/crypto-utils/uid-safe/master.svg
[coveralls-url]: https://coveralls.io/r/crypto-utils/uid-safe?branch=master
[downloads-image]: https://img.shields.io/npm/dm/uid-safe.svg
[downloads-url]: https://npmjs.org/package/uid-safe