node.js - Can't receive correct answer from Squareup API -

i'm trying send post message square create item

var postdata = {         "name": "milkshake",         "variations": [                         {                             "name": "small",                             "pricing_type": "fixed_pricing",                             "price_money": {                                                 "currency_code": "usd",                                                 "amount": 400                                             }                         }                     ]}  request.post({ uri:"https://connect.squareup.com/v1/me/items", headers:{'authorization': 'bearer ' + access_token,              'accept':        'application/json',              'content-type':  'application/json'}, body: querystring.stringify(postdata) },function(err,res,body){     console.log(res.statuscode);     console.log(body); }); 

but receive message square

{"type":"bad_request","message":"invalid json"} 

you're getting error because used querystring.stringify, produces url encoded request body. want json.stringify produce json encoded body. i.e:

request.post({ uri:"https://connect.squareup.com/v1/me/items", headers:{'authorization': 'bearer ' + access_token,              'accept':        'application/json',              'content-type':  'application/json'}, body: json.stringify(postdata) },function(err,res,body){     console.log(res.statuscode);     console.log(body); });