Avoid adding duplicate values to array

I have an array with below values.

const array1 = [
      { id: "1111" },
      { id: "2222" },
      { id: "3333"},
      { id: "4444"},
      { id: "5555"}
    ];

Suppose I want to add {“id” : “1111”} once again or any other duplicate {key:value} pair, then how to prevent it from adding in the array ?

Please help on this.