This is the geoserver WFS.

GeoserverWFS.js

//Geoserver Web Feature Service
$.ajax('http://localhost:8080/geoserver/wfs',{
  type: 'GET',
  data: {
      service: 'WFS',
      version: '1.1.0',
      request: 'GetFeature',
      typename: 'tajikistan:country',
      CQL_FILTER: `name_rg='Centre'`,
      srsname: 'EPSG:4326',
      outputFormat: 'text/javascript',
      },
  dataType: 'jsonp',
  jsonpCallback:'callback:handleJson',
  jsonp:'format_options'
  });


function handleJson(data) {
    var a = L.geoJson(data).addTo(map);
    map.fitBounds(a.getBounds())
}