I have used Penzu as my main journal app for many years. Recently when Apple launched its Journal app I have been looking at it and other competitors. Then I realized that I am not able to get my own data from Penzu. There is no reasonable Export function. So I found my own way to get my journal data. I could name this blog post to something like “How to export the unexportable”, or “How to intercept XHR requests in Puppeteer”, but my case is about Penzu, so I’ll stick to this particular title.

$.ajax is great, it hides much of the complexity. But sometimes we need to work with “raw” javascript :) So let’s look behind the scenes. The XMLHttpRequest (or just XHR) is used to open a connection to a server without a page reload. Internet Explorer calls it ActiveXObject and it differs in IE versions. Wikipedia article gives a good example how to create one constructor for all browsers: [sourcecode language=“javascript”]if (typeof XMLHttpRequest == “undefined”) XMLHttpRequest = function () { try { return new ActiveXObject(“Msxml2.

In one of my previous posts I showed how to retrieve data from listdata.svc with jQuery $.getJSON method. Getting data is very simple, listdata.svc provides a powerful restful interface with filtering, expanding and other features. Read the best and short introduction to listdata.svc by Suneet Sharma or a more detailed and technical article about filters, functions and operators by Mike Flasko at Microsoft with short examples here. Now back to listdata.