JSFiddle - React, Tailwind, and code Playground
HTML
<input id="filter[default][did.did]" value="10">
JavaScript
var did1 = $('#filter\\[default\\]\\[did\\.did\\]').val();
alert(did1)
<input id="filter[default][did.did]" value="10">
var did1 = $('#filter\\[default\\]\\[did\\.did\\]').val();
alert(did1)