JSFiddle - React, Tailwind, and code Playground

JavaScript

var mapping = [     //response.mapping
    ["userOne", 1],
    ["userTwo", 2],
    ["userthree", 3],
    ["userfour", 4],

    ["personOne", 1],
    ["personTwo", 2],
    ["personOne", 3],
];
    
var jsonMapping = [];
for (var i = 0; i < mapping.length; i++) {
    jsonMapping.push(JSON.stringify(mapping[i]));
}
var captured_list_elm = ["personOne", 1];
var status = jsonMapping.indexOf(JSON.stringify(captured_list_elm));
alert("status= "+status);