require(["esri/geometry/projection"], (projection) => { /* code goes here */ });
import * as projection from "@arcgis/core/geometry/projection.js";
esri/geometry/projection
A clientside projection engine for converting geometries from one SpatialReference to another. When projecting geometries the starting spatial reference must be specified on the input geometry. You can specify a specific geographic (datum) transformation for the project operation, or accept the default transformation if one is needed.
Known Limitations

The browser must support WebAssembly for the clientside engine to work.

Currently, only equationbased geographic transformations are supported.
Method Overview
Name  Return Type  Summary  Object 

GeographicTransformation  Returns the default geographic transformation used to convert the geometry from the input spatial reference to the output spatial reference. more details  projection  
GeographicTransformation[]  Returns a list of all geographic transformations suitable to convert geometries from the input spatial reference to the specified output spatial reference. more details  projection  
Boolean  Indicates if all dependencies of this module have been loaded. more details  projection  
Promise  Loads this module's dependencies. more details  projection  
GeometryGeometry[]  Projects a geometry or an array of geometries to the specified output spatial reference. more details  projection 
Method Details

getTransformation(inSpatialReference, outSpatialReference, extent){GeographicTransformation}

Returns the default geographic transformation used to convert the geometry from the input spatial reference to the output spatial reference. The default transformation is used when projecting geometries where the datum transformation is required but not specified in the
geographicTransformation
parameter.Known Limitations
 This method returns equationbased geographic transformations only.
 Geographic transformations are returned with their maximum number of steps. Currently, number of steps is limited to 2.
ParametersAutocasts from ObjectThe input spatial reference from which to project geometries. This is the spatial reference of the input geometries.
Autocasts from ObjectThe spatial reference to which you are converting the geometries.
extent ExtentoptionalAn extent used to determine the suitability of the returned transformation. The extent will be reprojected to the
inSpatialReference
if it has a different spatial reference.ReturnsType Description GeographicTransformation Returns the default geographic transformation for the given parameters. If no transformation is required or there are no suitable transformations, then null
is returned.

getTransformations(inSpatialReference, outSpatialReference, extent){GeographicTransformation[]}

Returns a list of all geographic transformations suitable to convert geometries from the input spatial reference to the specified output spatial reference. The list is ordered in descending order by suitability, with the most suitable being first in the list.
Known Limitations
 This method returns all the suitable equationbased geographic transformations.
 Geographic transformations are returned with their maximum number of steps. Currently, number of steps is limited to 2.
ParametersAutocasts from ObjectThe spatial reference that the geometries are currently using.
Autocasts from ObjectThe spatial reference to which you are converting the geometries to.
extent ExtentoptionalAn extent used to determine the suitability of the returned transformations. The extent will be reprojected to the input spatial reference if necessary.
ReturnsType Description GeographicTransformation[] Returns an array containing the maximum number the suitable geographic transformations that can be used to convert geometries between input and output spatial references. The list will be empty if the provided extent lies out of the area of use for the input spatial reference. Exampleconst cs1 = new SpatialReference({ wkid: 4272 //PE_GCS_ED_1950 }); const cs2 = new SpatialReference({ wkid: 4167 }); const extent = new Extent({ xmin: 186.0, ymin: 42.0, xmax: 179.0, ymax: 38.0 }); const geogtrans = projection.getTransformations(cs1, cs2, extent); geogtrans.forEach(function(geogtran, index) { geogtran.steps.forEach(function(step, index) { console.log("step wkid: ", step.wkid); }); });

isLoaded(){Boolean}

Indicates if all dependencies of this module have been loaded.
ReturnsType Description Boolean Returns true
if this module's dependencies have been loaded.

load(){Promise}

Loads this module's dependencies. This method must be called before projecting geometries.
ReturnsType Description Promise Resolves when the dependencies have been loaded.  See also
Exampleprojection.load().then(function() { // the projection module is loaded. Geometries can be reprojected. // projects each polygon in the array // project() will use the spatial reference of the first geometry in the array // as an input spatial reference. It will use the default transformation // if one is required when converting from input spatial reference // to the output spatial reference let outSpatialReference = new SpatialReference({ wkid: 53008 //Sphere_Sinusoidal projection }); polygonGraphics.forEach(function(graphic) { graphic.geometry = projection.project(graphic.geometry, outSpatialReference); }); });

Projects a geometry or an array of geometries to the specified output spatial reference. A default geographic transformation is used if not explicitly provided, but required. Use the getTransformation() method to find out which transformation is used by default for the given input and output spatial references.
Note that you must load this module before attempting to project geometries.
Known Limitations
This method uses the spatial reference of the first geometry as an input spatial reference. Therefore all geometries in the array must have the same spatial reference.
ParametersThe geometry or geometries to project.
Autocasts from ObjectThe spatial reference to which you are converting the geometries' coordinates.
geographicTransformation GeographicTransformationoptionalThe geographic transformation used to transform the geometries. Specify this parameter to project a geometry when the default transformation is not appropriate for your requirements.
ReturnsType Description Geometry  Geometry[] The result will be an array if an array of geometries is used as input. It will be a single geometry if a single geometry used as input. Examples// projects each polygon in the array // project() will use the spatial reference of the first geometry in the array // as an input spatial reference. It will use the default transformation // if one is required when converting from input spatial reference // to the output spatial reference let outSpatialReference = new SpatialReference({ wkid: 53008 //Sphere_Sinusoidal projection }); polygonGraphics.forEach(function(graphic) { graphic.geometry = projection.project(graphic.geometry, outSpatialReference); });
let outSpatialReference = { wkid: 54044 }; // projects an array of points let projectedPoints = projection.project(wgsPoints, outSpatialReference); projectedPoints.forEach(function(point) { console.log(point.x, point.y); });