fb-custom-audiences.js

// FB curl example
// curl \
//   -F 'pixel_id=<PIXEL_ID>' \
//   -F 'name=My New Website Custom Audience' \
//   -F 'subtype=WEBSITE' \
//   -F 'retention_days=15' \
//   -F 'rule={"url":{"i_contains":"shoes"}}' \
//   -F 'prefill=1' \
//   -F 'access_token=<ACCESS_TOKEN>' \
//   https://graph.facebook.com/v2.7/act_<AD_ACCOUNT_ID>/customaudiences

(function(){
  var req = new XMLHttpRequest();

  var pathparts = window.location.pathname.split('/');
  var endpath = pathparts[pathparts.length-1];

  var kvps = [
      {"pixel_id"       : "<PIXEL_ID>"}
    , {"name"           : endpath}
    , {"subtype"        : "WEBSITE"}
    , {"retention_days" : "15"}
    , {"rule"           : "{\"url\":{\"i_contains\":\"" + endpath + "\"}}"}
    , {"prefill"        : "1"}
    , {"access_token"   : "<ACCESS_TOKEN>"}
  ];

  var toStrings = function(obj) {
    return Object.keys(obj).map(function (key) {
      return key + '=' + obj[key];
    });
  }

  var toQuery = function(pv, cv, ci, arr) {
    return pv + '&' + cv
  }

  var post = kvps.map(toStrings).reduce(toQuery);

  req.open("POST", "https://graph.facebook.com/v2.7/act_<AD_ACCOUNT_ID>/customaudiences", true);

  req.onreadystatechange = function () {
    if (req.readyState != 4 || req.status != 200) return;
    console.log("unable to post");
  };

  req.send(post);
}).call(this);