Show HN: An online collaborative UML editor using PlantUML

Hi,<p>I built CollabUML after the need to work on designing systems with my peers, instead of screensharing, it&#x27;s simpler to go into a website and start collaborating, it saves bandwidth which can be a problem sometimes, and it allows your peers to do edits instead of just telling you want to modify.<p>After thinking a bit and talking with people, looks like it can be useful for system design interviews.<p>I&#x27;m still thinking how to evolve it, if you have any ideas, let me know.<p>Be aware that anyone can go to any board, hence, avoid placing private information.<p>Thanks.

The HackMD version of CodiMD[1] also supports this, letting you collaboratively edit a PlantUML diagram embedded in a Markdown document.<p>[1]: <a href="https:&#x2F;&#x2F;github.com&#x2F;hackmdio&#x2F;codimd" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;hackmdio&#x2F;codimd</a><p>Some improvement suggestions:<p><pre><code> * Implement shareable URLs (the session name should be in the URL). * Don&#x27;t immediately prompt a session name but explain the purpose of the website. * Link the PlantUML documentation.</code></pre>

Couldn&#x27;t resist myself from modifying the default diagram.<p><pre><code> CollabUML -&gt; You ++: Welcome to CollabUML, The collaborative UML editor return Sounds good, but How do I use it? CollabUML --&gt; You : Just share the url with anyone CollabUML --&gt; You : and start collaborating CollabUML -&gt; You ++: It&#x27;s very handy for designing systems with your peers return How does it works? CollabUML -&gt; You ++: It&#x27;s powered by https:&#x2F;&#x2F;plantuml.com \nBe sure to check their docs to see the wonderful things you can do\n Just like this sequence diagram return Awesome!</code></pre>

I get an error about the browser not supporting cookies. In the browser console I get this:<p><pre><code> A cookie associated with a cross-site resource at http:&#x2F;&#x2F;64.225.122.27&#x2F; was set without the `SameSite` attribute. It has been blocked, as Chrome now only delivers cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application&gt;Storage&gt;Cookies and see more details at https:&#x2F;&#x2F;www.chromestatus.com&#x2F;feature&#x2F;5088147346030592 and https:&#x2F;&#x2F;www.chromestatus.com&#x2F;feature&#x2F;5633521622188032. </code></pre> Chrome Version 80.0.3987.163 (Official Build) (64-bit) on a Apple MacOS

All I am getting is :<p><pre><code> TypeError: pad.collabClient is null in http:&#x2F;&#x2F;64.225.122.27:9001&#x2F;javascripts&#x2F;lib&#x2F;ep_etherpad-lite&#x2F;static&#x2F;js&#x2F;pad.js?callback=require.define at line 3&#x27;</code></pre>

Friendly tip: you should sanitize your inputs &#x2F; ouput.

Cool idea! Really like UML and am sad that it doesn&#x27;t get used as often as it should.

I&#x27;m curious as to how it gets usernames as I never input that anywhere.

Opened from a mobile and it doesn&#x27;t seem to work.