{ claus.conrad }

Web development


  • Front-end Developer Interview Questions

    A list of helpful front-end related questions you can use to interview potential candidates, test yourself or completely ignore.

  • The Twelve-Factor App

    The twelve-factor app is a methodology for building software-as-a-service apps that:

    • Use declarative formats for setup automation, to minimize time and cost for new developers joining the project;
    • Have a clean contract with the underlying operating system, offering maximum portability between execution environments;
    • Are suitable for deployment on modern cloud platforms, obviating the need for servers and systems administration;
    • Minimize divergence between development and production, enabling continuous deployment for maximum agility;
    • And can scale up without significant changes to tooling, architecture, or development practices.
  • web.dev

    Guidance to build modern web experiences that work on any browser.

  • Open Web Docs - developing MDN documentation


  • httpstat.us

    This is a super simple service for generating different HTTP codes.

    It’s useful for testing how your own scripts deal with varying responses.

    Just add the status code you want to the URL, like this: httpstat.us/200

  • Clipboard Inspector

    A tool to help you explore the kinds of data available when you paste something on a web page, or drop something onto it.

  • Timestamp To Date Converter

    Convert timestamp to date or date to timestamp easily

  • time.is

    exact time for any time zone

  • placekitten

    A quick and simple service for getting pictures of kittens for use as placeholders in your designs or code. Just put your image size (width & height) after our URL and you’ll get a placeholder.

    Like this: https://placekitten.com/200/300 or: https://placekitten.com/g/200/300

  • PWA Builder

    Best SVG optimizer and minifier

  • Kaltura Video Cloud Platform

    Easy to use, typo tolerant and fast address autocomplete API to help you increasing the user experience on your address forms.

  • Marker.io

    Send feedback and bug reportswithout leaving your website

  • mail-tester.com

Test the Spammyness of your Emails




  • Amazon Web App Tester

    Want to see how your HTML5 Web App or mobile optimized website behaves on Fire TV, Fire TV Stick, Fire Phone, Fire Tablets, or Android devices? Use the Web App Tester to evaluate the customer experience of your app before you submit it and to debug directly on the devices. Using the Web App Tester you can quickly validate your implementation of Amazon In-App Purchasing API for JavaScript (requires Amazon’s Mobile SDK Tester).

  • Playwright

    Playwright enables reliable end-to-end testing for modern web apps.

Component libraries