WFS

main.js

import GeoJSON from 'ol/format/GeoJSON.js';
import Map from 'ol/Map.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import XYZ from 'ol/source/XYZ.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {bbox as bboxStrategy} from 'ol/loadingstrategy.js';

const vectorSource = new VectorSource({
  format: new GeoJSON(),
  url: function (extent) {
    return (
      'https://ahocevar.com/geoserver/wfs?service=WFS&' +
      'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +
      'outputFormat=application/json&srsname=EPSG:3857&' +
      'bbox=' +
      extent.join(',') +
      ',EPSG:3857'
    );
  },
  strategy: bboxStrategy,
});

const vector = new VectorLayer({
  source: vectorSource,
  style: {
    'stroke-width': 0.75,
    'stroke-color': 'white',
    'fill-color': 'rgba(100,100,100,0.25)',
  },
});

const key = 'Get your own API key at https://www.maptiler.com/cloud/';
const attributions =
  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
  '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';

const raster = new TileLayer({
  source: new XYZ({
    attributions: attributions,
    url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
    maxZoom: 20,
  }),
});

const map = new Map({
  layers: [raster, vector],
  target: document.getElementById('map'),
  view: new View({
    center: [-8908887.277395891, 5381918.072437216],
    maxZoom: 19,
    zoom: 12,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>WFS</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>

    <script type="module" src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "vector-wfs",
  "dependencies": {
    "ol": "9.1.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}