Get an html attribute in node.js -

say have button like

<form action="/action1" method ="post"> <button type="submit" id="button1"> click me </button> </form> 

i want value stored in attributes (in case "id") , this

app.post('/action1', function (req, res) { var buttonid = req.id // part dont understand }); 

how fill in line

var buttonid =  

thank you

the posted data not include id attribute. can set name and/or value attribute , part of post request. e.g.

<button type="submit" name="button1">click me</button> 

to posted data in express here: express js form data