Multiple Instances of Swiper on Same page

multiple_swiper.js

if ($('.swiper-container').length > 0) { //some-slider-wrap-in
    let swiperInstances = [];
    $(".swiper-container").each(function(index, element){ //some-slider-wrap-in
        const $this = $(this);
        $this.addClass("instance-" + index); //instance need to be unique (ex: some-slider)
        $this.parent().find(".swiper-pagination").addClass("pagination-" + index);
        $this.parent().find(".swiper-button-prev").addClass("prev-" + index); //prev must be unique (ex: some-slider-prev)
        $this.parent().find(".swiper-button-next").addClass("next-" + index); //next must be unique (ex: some-slider-next)
        swiperInstances[index] = new Swiper(".instance-" + index, { //instance need to be unique (ex: some-slider)
            // your settings ...
            navigation: {
                prevEl: ".prev-" + index,  //prev must be unique (ex: some-slider-prev)
                nextEl: ".next-" + index, //next must be unique (ex: some-slider-next)
            },
            pagination: {
                el: '.pagination-' + index,
                type: 'bullets',
                clickable: true
            },
        });
    });

    // Now you can call the update on a specific instance in the "swiperInstances" object
    // e.g.
    swiperInstances[3].update();
    //or all of them
    setTimeout(function () {
        for (const slider of swiperInstances) {
            slider.update();
        }
    }, 50);
}


<div class="swiper-container">
    <div class="swiper-wrapper">
        <div class="swiper-slide">Slide 1</div>
        <div class="swiper-slide">Slide 2</div>
        <div class="swiper-slide">Slide 3</div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
</div>

Also, this is not need:

if ($('.swiper-container').length > 0) { //some-slider-wrap-in

First you are looping over elements you find here:

$(".swiper-container").each(function(index, element){

So, if there is no element nothing will be run.
Also, you can remove jquery and use plain js. You will have one problem less. :)