How do I convert array of objects to object in javascript?

I have an array of objects:

let userDetail = [{id: "12347442", name: "ZarNi" , age: 23}
{id: "2435457", name: "Michael" , age: 13},
{id: "8639503", name: "John" , age: 18}
]

I filtered this array into this:

let filteredUser = userDetail.filter(user => user.id === "12347442");

I need to put object to react state. so I've written like this:

this.setState({user: {...filteredUser}});

When I took the console for user state,I've got the result like this:

console.log(this.state.user);

Result => {0:{id: "12347442", name: "ZarNi" , age: 23}} as a result;

I don't want Key 0. I just want to get object like this

{id: "12347442", name: "ZarNi" , age: 23}