Tengo esto en mi front-end (html)

 <label for="sunday">Sunday</label> <input type="checkbox" id="sunday" name="sunday" value="1"> <label for="monday">Monday</label> <input type="checkbox" id="monday" name="monday" value="2"> <label for="tuesday">Tuesday</label> <input type="checkbox" id="tuesday" name="tuesday" value="3"> <label for="wednesday">Wednesday</label> <input type="checkbox" id="wednesday" name="wednesday" value="4"> <label for="thursday">Thursday</label> <input type="checkbox" id="thursday" name="thursday" value="5"> <label for="friday">Friday</label> <input type="checkbox" id="friday" name="friday" value="6"> <label for="saturday">Saturday</label> <input type="checkbox" id="saturday" name="saturday" value="7">

luego, en mi backend, quiero enviar los que han sido seleccionados en la base de datos. Así que estaba pensando en escribir algo como:

 var dates = { monday: req.body.monday, tuesday: req.body.tuesday, wednesday: req.body.wednesday, thursday: req.body.thursday, friday: req.body.friday, saturday: req.body.saturday, sunday: req.body.sunday } for (const item in dates) { console.log(item.value) if (item.value == undefined) { item = false console.log("undefined") } }