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# freeport-async
Finds an available port for your application to use.
You can specify a range where to look for an available port.
And can also find a range of available ports for you to use.
You can also be used to test to see if a given port is available.
All functions are async and return Promises.
## Usage
### Basic
```js
let freeportAsync = require("freeport-async");
let portICanUse = await freeportAsync();
```
### Advanced
```js
let freeportAsync = require("freeport-async");
let portIn9000Range = await freeportAsync(9000);
let portAvailableForAnyOrLocalhost = await freeportAsync(9000, {
hostnames: [null, "localhost"]
});
let isPort5000Available = await freeportAsync.availableAsync(5000);
let listOf5ConsecutiveAvailablePorts = await freeportAsync.rangeAsync(5);
let freeRangeIn12000Range = await freeportAsync.rangeAsync(3, 12000);
```
## Important Note
Note that this code just finds available ports, but doesn't reserve them in any way.
This means that if you have other code that might be looking for a port in the same range at the same time, you could run into issues.
Also, if you call `freeportAsync` twice in a row, it will often return the same port number twice. If you want to find two (or more) ports you can use, you need to call `freeportAsync.rangeAsync(<number-of-ports>, [startSearchFrom])`.
See also https://gist.github.com/mikeal/1840641
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