zapier_code_create_medium_post.js

var mediumIntegrationToken = "REPLACE_WITH_YOUR_MEDIUM_INTEGRATION_TOKEN";
// That's it. No need to edit anything else below.

// split the comma-separated tags string into an array then remove any whitespace
var tagsArray = input.medium_tags.split(',');

for (var i = 0; i < tagsArray.length; i++) { 
  tagsArray[i] = tagsArray[i].trim();
}


var data = JSON.stringify({
  "title": input.medium_title,
  "contentFormat": "html",
  "content": input.medium_content,
  "canonicalUrl": input.medium_url,
  "publishStatus": input.medium_publish_status,
  "tags": tagsArray
});

// Look up the author id
fetch('https://api.medium.com/v1/me', {
  method: 'GET',
  headers: {
    'Authorization': 'Bearer ' + mediumIntegrationToken
  }
})
.then(function(res) {
  return res.json();
})
.then(function(body) {
  return body.data.id;
})
.then(function(authorId) {
  // Now create the medium post
  var apiUrl = 'https://api.medium.com/v1/users/' + authorId + '/posts';
  
  fetch(apiUrl, {
    method: 'POST',
    body: data,
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer ' + mediumIntegrationToken
    }
  })
  .then(function(res) {
    return res.json();
  })
  .then(function(body) {
    var output = body.data;
	  callback(null, output);
  })
  .catch(callback);
});

Updated to allow sending to the drafts folder via publishStatus.

• The data can some times become mangled (if you embed an SVG for example).
• The data is also missing a feature image (there is no way to send this, unless you have special permission).
• The data is missing a subtitle and description that need to be manually added.

All simple and quick to do before publishing so pushing to drafts may be preferable.