# @turf/kinks

# kinks

Takes a [linestring](http://geojson.org/geojson-spec.html#linestring), [multi-linestring](http://geojson.org/geojson-spec.html#multilinestring), [multi-polygon](http://geojson.org/geojson-spec.html#multipolygon), or [polygon](http://geojson.org/geojson-spec.html#polygon) and returns [points](http://geojson.org/geojson-spec.html#point) at all self-intersections.

**Parameters**

-   `featureIn` **[Feature](http://geojson.org/geojson-spec.html#feature-objects)<([LineString](http://geojson.org/geojson-spec.html#linestring) \| [MultiLineString](http://geojson.org/geojson-spec.html#multilinestring) \| [MultiPolygon](http://geojson.org/geojson-spec.html#multipolygon) \| [Polygon](http://geojson.org/geojson-spec.html#polygon))>** input feature

**Examples**

```javascript
var poly = turf.polygon([[
  [-12.034835, 8.901183],
  [-12.060413, 8.899826],
  [-12.03638, 8.873199],
  [-12.059383, 8.871418],
  [-12.034835, 8.901183]
]]);

var kinks = turf.kinks(poly);

//addToMap
var addToMap = [poly, kinks]
```

Returns **[FeatureCollection](http://geojson.org/geojson-spec.html#feature-collection-objects)<[Point](http://geojson.org/geojson-spec.html#point)>** self-intersections

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---

This module is part of the [Turfjs project](http://turfjs.org/), an open source
module collection dedicated to geographic algorithms. It is maintained in the
[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
PRs and issues.

### Installation

Install this module individually:

```sh
$ npm install @turf/kinks
```

Or install the Turf module that includes it as a function:

```sh
$ npm install @turf/turf
```