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<!DOCTYPE html> <html> <body> <p>How to create a JavaScript object array.</p> <p id="demo"></p> <script> var employees = [ { "firstName":"John", "lastName":"Doe" }, { "firstName":"Anna", "lastName":"Smith" }, { "firstName":"Peter", "lastName":"Jones" } ]; employees[0]["firstName"] = "Gilbert"; document.getElementById("demo").innerHTML = employees[0].firstName + " " + employees[0].lastName; </script> </body> </html>