This example uses OpenLayers v10.9.0. The latest is v.
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#### geojson-vt integration

mapbox 8 vector 86 tiles 8 geojson 11

#####

Slice GeoJSON into vector tiles on the fly in the browser.

Example of slicing GeoJSON into vector tiles with the geojson-vt library.

##### main.js

    import geojsonvt from 'geojson-vt';
    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import GeoJSON from 'ol/format/GeoJSON.js';
    import VectorTileLayer from 'ol/layer/VectorTile.js';
    import Projection from 'ol/proj/Projection.js';
    import VectorTileSource from 'ol/source/VectorTile.js';

    // Converts geojson-vt data to GeoJSON
    const replacer = function (key, value) {
      if (!value || !value.geometry) {
        return value;
      }

      let type;
      const rawType = value.type;
      let geometry = value.geometry;
      if (rawType === 1) {
        type = 'MultiPoint';
        if (geometry.length == 1) {
          type = 'Point';
          geometry = geometry[0];
        }
      } else if (rawType === 2) {
        type = 'MultiLineString';
        if (geometry.length == 1) {
          type = 'LineString';
          geometry = geometry[0];
        }
      } else if (rawType === 3) {
        type = 'Polygon';
        if (geometry.length > 1) {
          type = 'MultiPolygon';
          geometry = [geometry];
        }
      }

      return {
        'type': 'Feature',
        'geometry': {
          'type': type,
          'coordinates': geometry,
        },
        'properties': value.tags,
      };
    };

    const layer = new VectorTileLayer({
      background: '#1a2b39',
      style: {
        'fill-color': ['string', ['get', 'COLOR'], '#eee'],
      },
    });

    const map = new Map({
      layers: [layer],
      target: 'map',
      view: new View({
        center: [0, 0],
        zoom: 2,
      }),
    });

    const url = 'https://openlayers.org/data/vector/ecoregions.json';
    fetch(url)
      .then(function (response) {
        return response.json();
      })
      .then(function (json) {
        const tileIndex = geojsonvt(json, {
          extent: 4096,
          debug: 1,
        });
        const format = new GeoJSON({
          // Data returned from geojson-vt is in tile pixel units
          dataProjection: new Projection({
            code: 'TILE_PIXELS',
            units: 'tile-pixels',
            extent: [0, 0, 4096, 4096],
          }),
        });
        const vectorSource = new VectorTileSource({
          tileUrlFunction: function (tileCoord) {
            // Use the tile coordinate as a pseudo URL for caching purposes
            return JSON.stringify(tileCoord);
          },
          tileLoadFunction: function (tile, url) {
            const tileCoord = JSON.parse(url);
            const data = tileIndex.getTile(
              tileCoord[0],
              tileCoord[1],
              tileCoord[2],
            );
            const geojson = JSON.stringify(
              {
                type: 'FeatureCollection',
                features: data ? data.features : [],
              },
              replacer,
            );
            const features = format.readFeatures(geojson, {
              extent: vectorSource.getTileGrid().getTileCoordExtent(tileCoord),
              featureProjection: map.getView().getProjection(),
            });
            tile.setFeatures(features);
          },
        });
        layer.setSource(vectorSource);
      });

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>geojson-vt integration</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": "geojson-vt",
      "dependencies": {
        "ol": "10.9.0",
        "geojson-vt": "^4.0.2"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }