Pagination using MongoDB, Nunjucks, and Express

bundles.njk

        <small class="d-block text-right mt-3" style="padding-top: 30px;padding-bottom: 30px;">
        {% set current = current|int %}
        {% set pages = pages|int %}
            {% if pages > 0 %}
                <ul class="pagination text-center" style="position: absolute;left:50%;transform: translate(-50%,-50%);">
                    {% if current == 1 %}
                        <li class="page-item disabled"><a class="page-link">First</a></li>
                    {% else %}
                        <li class="page-item"><a class="page-link" href="/admin/bundles/1">First</a></li>
                    {% endif %}

                    {% if current > 5 %}
                        {% set i = current - 4 %}
                    {% else %}
                        {% set i = 1 %}
                    {% endif %}
                    
                    {% if i !== 1 %}
                        <li class="page-item disabled"><a class="page-link">...</a></li>
                    {% endif %}

                    {% set length = current + 4 %} 
                    {% for x in range(i, length) %}
                        {% if x <= pages %}
                            {% if x == current %}
                                <li class="page-item active"><a class="page-link">{{ x }}</a></li>
                            {% else %}
                                <li class="page-item"><a class="page-link" href="/admin/bundles/{{ x }}">{{ x }}</a></li>
                            {% endif %} 
                            {% if (x == current + 4) and (x < pages) %}
                                <li class="disabled page-item"><a class="page-link">...</a></li>
                            {% endif %}
                        {% endif %}
                    {% endfor %}
                    {% if current == pages %}
                        <li class="disabled page-item"><a class="page-link">Last</a></li>
                    {% else %}
                        <li class="page-item"><a class="page-link" href="/admin/bundles/{{ pages }}">Last</a></li>
                    {% endif %}
                </ul>
            {% endif %}
        </small>

route.js

    router.get('/bundles/:page', isAdmin, (req, res) => {

        let perPage = 2
        let page = req.params.page || 1

        discord.getRoles(settings.discord.bot_token, settings.discord.guild_id, async (err, roles) => {
            let rolesArr = roles.map(x => {
                x.color = intToRGB(x.color);
                return x;
            });
            Bundle
                .find({})
                .skip((perPage * page) - perPage)
                .limit(perPage)
                .exec((err, bundles) => {
                    Bundle.count().exec((err, count) => {
                        if (err) return next(err);

                        return res.render('admin/bundles', {
                            bundles: bundles,
                            roles: _.reject(rolesArr, (x) => {
                                return x.name == '@everyone' || x.managed;
                            }),
                            current: page,
                            pages: Math.ceil(count / perPage),
                            page: 'bundles',
                            max: Math.max
                        });
                    });
                });
        });

    });