Convert and parse between Well-Known-Text (WKT) and GeoJSON

Using npm npm i wkt-parser-helper

Using pnpm pnpm i wkt-parser-helper

In CommonJS env

const { wktToGeojson } = require('wkt-parser-helper');

const geojson = wktToGeojson(
  'POLYGON ((-3.706512451171875 40.420074462890625, -3.70513916015625 40.420074462890625, -3.70513916015625 40.42144775390625, -3.706512451171875 40.42144775390625, -3.706512451171875 40.420074462890625))'
);

// geojson is a Polygon Geometry

Using imports

import { geojsonToWkt } from 'wkt-parser-helper';

const myFeature: Feature = {
  type: 'Feature',
  properties: {},
  geometry: {
    type: 'Polygon',
    coordinates: [
      [
        [-3.706512451171875, 40.420074462890625],
        [-3.70513916015625, 40.420074462890625],
        [-3.70513916015625, 40.42144775390625],
        [-3.706512451171875, 40.42144775390625],
        [-3.706512451171875, 40.420074462890625],
      ],
    ],
  },
};

const myFeatureAsWKT = geojsonToWkt(myFeature);

// myFeatureAsWKT is 'POLYGON ((-3.706512451171875 40.420074462890625, -3.70513916015625 40.420074462890625, -3.70513916015625 40.42144775390625, -3.706512451171875 40.42144775390625, -3.706512451171875 40.420074462890625))'

From v4.0.0 onwards, support for converting GeoJSON to WKB is dropped.

In v7.0.0, functions have been renamed:

const EMPTY_GEOMETRY_COLLECTION_WKT: 'GEOMETRYCOLLECTION EMPTY' =
  'GEOMETRYCOLLECTION EMPTY';

Defined in: index.ts:15

function featureCollectionToWkt(featureCollection: FeatureCollection): string;

Defined in: index.ts:42

Converts a GeoJSON FeatureCollection to WKT GeometryCollection

string

The GeoJSON converted to well known representation

function featureCollectionToWktList<P>(
  geojson: FeatureCollection<Geometry, P>
): P & object[];

Defined in: index.ts:83

Converts a GeoJSON FeatureCollection into an array of objects where each object contains a WKT string representing the geometry and the properties from the original GeoJSON feature

P & object[]

An array of objects where each object contains a wkt string representing the geometry and all the properties from the original GeoJSON feature

function featureToWkt(geojson: Feature): string;

Defined in: index.ts:33

Converts GeoJSON Feature to WKT

string

The GeoJSON converted to well known text representation

function geojson3dTo2d(geojson: GeoJSON): GeoJSON;

Defined in: index.ts:140

Parse a 3D GeoJSON into a 2D GeoJSON

GeoJSON

The GeoJSON as 2D

function geojsonToWkt(geojson: GeoJSON): string;

Defined in: index.ts:62

Shorthand to convert GeoJSON Features, Geometries or FeatureCollections to WKT

string

The GeoJSON as WKT

function geometryToWkt(geojson: Geometry): string;

Defined in: index.ts:23

Converts GeoJSON Geometry to WKT

string

The GeoJSON converted to well known text representation

function wkt3dTo2d(wkt: string): string;

Defined in: index.ts:195

Parse a Z WKT into a 2D WKT

string

The Z WKT as 2D WKT

function wktToGeojson(
  item: string,
  asFeature?: boolean,
  properties?: GeoJsonProperties
): Geometry | Feature<Geometry, GeoJsonProperties>;

Defined in: index.ts:100

Parse a WKT into a GeoJSON Feature or Geometry

Geometry | Feature<Geometry, GeoJsonProperties>

The WKT as GeoJSON