JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="savedInput"/>

JavaScript

$('#savedInput').autocomplete({
    source:JSON.parse(localStorage.previousInputs)
});
    
$('#savedInput').change(function(){
    
    if( localStorage.previousInputs == undefined ) {
        localStorage.previousInputs = JSON.stringify([]);
    }

    var prevArray = JSON.parse(localStorage.previousInputs);
    prevArray.push($(this).val());
    localStorage.previousInputs = JSON.stringify(prevArray);
    
    $('#savedInput').autocomplete({
        source:JSON.parse(localStorage.previousInputs)
    });
    
});