JSFiddle - React, Tailwind, and code Playground

JavaScript

var arrayExample = 
[{"name":"Test1","id":[1]},
{"name":"Test2","id":[2]},
{"name":"Test3","id":[3]},
{"name":"Test4","id":[4]},
{"name":"Test5","id":[5]}];

function insertItem(obj,searchTerm){
    $.each(arrayExample,function(i,item){
      if(item.name == searchTerm){
           arrayExample.splice(i+1,0,obj); 
          return false;
      }
    });
}

insertItem({"name":"Test3.0001","id":[3,6]},"Test3");

console.log(arrayExample);