Geojson with multipolygons located in Italy projecting in the Red Sea

Question

I am trying to project my geometries, composed of multipolygons, in my openlayers map. When I do this my geometries are displayed in the Red Sea near Yemen. I have seen that it looks like the coodinates are inverted (lat and long inverted). I get my geometries from a geoJson and I don´t know how to solve this. This is my code:

var myview = new View({
  center: [15.450187402143, 41.18702782291],
  projection: 'EPSG:4326',
  zoom: 6
})

var mylayer = new TileLayer({
  source: new OSM()
})

var layer = [mylayer]

const map = new Map({
  target: 'map',
  layers: layer,
  view: myview
}); 


const vectorSource = new VectorSource({
  format: new ol.format.GeoJSON(),
  features: (new ol.format.GeoJSON()).readFeatures(geoJson, {dataProjection: 'EPSG:3857',
  featureProjection: map.getView().getProjection()})
  //EPSG:32633 - WGS 84 / UTM zone 33N
  //features: new GeoJSON().readFeatures(geoJson, {dataProjection: 'EPSG:4326', FeatureProjection: map.getView().getProjection()})
});

vectorSource.addFeatures((vectorSource.getFormat()).readFeatures(geoJson));
const vectorLayer = new VectorLayer({
  source: vectorSource
});

map.addLayer(vectorLayer);