JSFiddle - React, Tailwind, and code Playground

HTML

<input value="111"> //similar
<input value="222">
<input value="111"> //similar
<input value="333">

JavaScript

var duplicatefound = false;
    $('input').each(function(index, item){
        if (duplicatefound) return;
        val = $(item).val();
        if ($('input[value="' + val + '"]').length < 2) return;
        duplicatefound = true;
        alert('There are similar values');
    });