JSFiddle - React, Tailwind, and code Playground

HTML

<input type="range" min="10" max="10000" step="0.50" id="mensualite_slider" value="547.45" size="4" />
        <input type="text" name="mensualite" id="mensualite" value="547.45" size="4" />

JavaScript

$('#mensualite_slider').on('input', function(){
    $('#mensualite').val($('#mensualite_slider').val());
});

$('#mensualite').on('input', function(){
    $('#mensualite_slider').val($('#mensualite').val());
});