Query a feature layer (SQL)

A feature layer can contain a large number of features. To access a subset of the features, you can execute a SQL or spatial query, or both at the same time. You can also return the attributes, geometry, or both attributes and geometry for each record. SQL and spatial queries are useful when a feature layer is very large and you just want to access a subset of the data.

In this tutorial, you access and query a hosted feature layer with a SQL where clause and only return the first record.

Prerequisites

You need a free ArcGIS developer account to access your dashboard and API keys. The API key must be scoped to access the services used in this tutorial.

Steps

Create a new pen

  1. If you are using the CDN libraries, to get started.

Make the request

Copy and paste the code below, following the steps to make a request to the feature service.

  1. Reference the ArcGIS REST JS libraries either through CDN, ES Modules, or Node JS.

  2. Set the apiKey with the API key from your dashboard.

  3. Define the parameters needed for the request.

  4. Call the feature service and handle the results.

CDNES ModulesNode JS
Add line.Change lineAdd line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.
                                                    
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>ArcGIS REST JS</title>
  <style>
    body {
      font-family: monospace;
      color: white;
    }
    pre {
      overflow: auto;
      padding: 1rem;
    }
    body,pre{
      background: #000000;
    }
  </style>
</head>
<body>
  <pre id="result"></pre>

  <!-- require ArcGIS REST JS libraries from https://unpkg.com -->
  <script src="https://unpkg.com/@esri/arcgis-rest-request@3.0.0/dist/umd/request.umd.js"></script>
  <script src="https://unpkg.com/@esri/arcgis-rest-auth@3.0.0/dist/umd/auth.umd.js"></script>
  <script src="https://unpkg.com/@esri/arcgis-rest-feature-layer@3.0.0/dist/umd/feature-layer.umd.js"></script>
  <script>
    /* when including ArcGIS REST JS all exports are available
    from the same arcgisRest global */

    const apiKey = "YOUR-API-KEY";

    const authentication = new arcgisRest.ApiKey({
      key: apiKey
    });

    arcgisRest.queryFeatures({
      url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0",
      where: "UseType = 'Residential'",
      resultRecordCount: 1,
      authentication
    })
      .then(response => {
        console.log(response.features);
        document.getElementById("result").textContent = JSON.stringify(response.features, null, 2);
      });

  </script>

</body>
</html>

Result

The request will return the following :

What's next?

Learn how to use additional ArcGIS location services in these tutorials: