Best way to paginate with Mongoose and Node.js

I am currently studying mongoose and I am building a pagination system. I made two codes, but I am wondering which one is the best way to do what I want in terms of performance and everything.

Script 1:

app.get("/:page",(req,res)=>{
            post.find({}).then((data)=>{
                let per_page = 2; // set how many posts per page
                let num_page = Number(req.params.page);
                let max_pages = Math.ceil(data.length/per_page);
                if(num_page == 0 || num_page > max_pages){
                    res.render('404');
                }else{
                    let starting = per_page*(num_page-1)
                    let ending = per_page+starting
                    res.render('posts', {posts:data.slice(starting,ending), pages: max_pages, current_page: num_page});
                }
            });
    });

      

        
        
        
      

    

Script 2:

app.get("/:page",(req,res)=>{
        post.count({}, (err, len)=>{
            let per_page = 2;  // set how many posts per page
            let num_page = Number(req.params.page);
            let max_pages = Math.ceil(len/per_page);
            if(num_page == 0 || num_page > max_pages){
                res.render('404');
            }else{
                let starting = per_page*(num_page-1);
                let ending = per_page+starting;
                let promise = post.find({}).limit(per_page).skip(starting);
                promise.then((data)=>{
                    res.render('posts', {posts:data, pages: max_pages, current_page: num_page});
                });
            }
        });
    });