Lodash Functions are not properly working for me

var _= require('lodash');

var _= require('lodash/core');

var fp = require('lodash/fp');


var array = require('lodash/array');
app.get('/home/:Titleid', function (req, res) {
  let TitleId=_.lowerCase(req.params.Titleid);
})

This is My code I have installed and properly required lodash in my project but still it is giving error "TypeError: _.lowerCase is not a function"