const myArray = [{key1: "value1", key2: "value2"}, {key1: "value4", key2: "value8"}, {key1: "value1", key2: "value3"}, {key1: "value1", key2: "value32"}] if(myArray.some(e => e.key1 == 'value1')) { console.log('Exists'); } Run code snippet