You can try this const list = [ { "a": "2", "ss": [ { "name": "pourush", "age": "25" }, { "name": "Mak", "age": "25" } ] }, { "b": "3", "ss": [ { "name": "James", "age": "19" }, { "name": "shaun", "age": "20" } ] } ] console.log(list.map(function(m) { return m.ss;} ).flat())