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<!DOCTYPE html> <html> <body> <p>How to loop through all properties in a JSON object.</p> <p id="demo"></p> <script> var myObj = { "name":"John", "age":30, "car":null }; for (x in myObj) { document.getElementById("demo").innerHTML += x + "<br>"; } </script> </body> </html>	How to loop through all properties in a JSON object.