Cover image for A beautiful open source comments for your blog

A beautiful open source comments for your blog

skorotkiewicz profile image Sebastian Korotkiewicz ・2 min read


You don't need a server to host your comment system, you can easily host Kucos on Vercel and database on Mongo Atlas where 500mb is for free (for comments it is a lot space :)).

Kucos is focused on complete user privacy and data security, that' s why commenting is completely anonymous, no account is needed.

Kucos is written entirely in JavaScript, backend in NodeJS with MongoDB (Mongoose) and frontend in pure JS. Source of Kucos can be found on GitHub kucosjs/kucos, I invite you to test the demo on this page, also I'm happy to see pull requests with your fixes or new features :)

A simple Markdown is also available, here you can check out the available Markdown.

Available functions:

  • Writing new comments
  • Reply to comments
  • Fast quote comments (select text and click Reply)
  • Hidding/showing children comments
  • Voting on comments
  • Markdown text formatting
  • Adding Kudos under post
  • Edit own comments within an hour
  • Simple moderation of comments by the website owner Screenshot
  • Checking whether a comment is spam. (Akismet)
  • Fast and lightweight code highlighting in comments

Add Kucos to your website

To add Kucos to your website you only need to add two additional lines.

<div id="comments"></div>
<script src="http://localhost:3000/min/kucos.min.js"></script>


Installation of Kucos is very simple, you need to download the source code then rename the config.example.js file to config.js and fill it in correctly.

$ git clone https://github.com/kucosjs/kucos
$ mv config.example.js config.js
$ vim config.js

Now all you have to do is npm install, run the command gulp and node index.js to start the server.

$ npm install
$ gulp
$ node index.js

Posted on by:

skorotkiewicz profile

Sebastian Korotkiewicz


IT Geek interested in all the things! System administration, web development and more!


Open source comments and kudos server for static websites


markdown guide

Looks like a good idea. I just tried your demo and there's no way to undo an accidental up/down vote?


No, you can't undo your vote.