jsonp ajax in google script

Question

I\'m trying to learn how to query for data from a local government data site (hoping I can teach my math students to do some data analysis). I\'m hoping to get the data and

Answer 1

Issue:

Whenever payload key is present in options/params argument of UrlFetchApp, the method is set to post by default. And any attempt to change the method to get is "silently" ignored. Other similar scripting platforms automatically convert the payload to url query parameters. But, UrlFetchApp silently changes the method to post and nothing else.

Solution:

Re-create the data object as a query string. For example, data:{x:1,y:2} should be changed to ?x=1&y=2 and appended to url.

Snippet:

function testapi() {
  var options = {
    method: 'get',
    // 'contentType': 'application/json',
    // 'payload' : data,//If set, method is ignored.
    headers: { Accept: '*/*', 'Content-Type': 'application/json' },
    muteHttpExceptions: true,
  };

  var url = 'https://data.gov.sg/api/action/datastore_search';
  //var url = 'https://httpbin.org/get'; test the method

  function objectToQueryParams(obj) {
    return (
      '?' +
      Object.entries(obj)
        .map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`)
        .join('&')
    );
  }
  var data = {
    resource_id: '1b702208-44bf-4829-b620-4615ee19b57c', // the resource id
    limit: 5, // get 5 results
    q: 'Yishun', // query for 'Yishun'
  };
  var query = objectToQueryParams(data);
  url += query;
  var response = UrlFetchApp.fetch(url, options).getContentText();
  Logger.log(response);
}

function objectToQueryParams(obj) {
  return (
    '?' +
    Object.entries(obj)
      .map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`)
      .join('&')
  );
}


var data = {
  resource_id: '1b702208-44bf-4829-b620-4615ee19b57c', // the resource id
  limit: 5, // get 5 results
  q: 'Yishun', // query for 'jones'
};
console.log(objectToQueryParams(data));

Related:

UrlSearchParams