ShowdownJS is described as 'Showdown is a JavaScript Markdown to HTML converter, based on the original works by John Gruber. Showdown can be used client side (in the browser) or server side (with NodeJs)' and is an app in the development category. There are five alternatives to ShowdownJS for Self-Hosted. The best ShowdownJS alternative is Markdown-it, which is both free and Open Source. Other great apps like ShowdownJS are Markdeep, Snarkdown, Strapdown.js and Marked.js.
Markdown-it is a high-speed Markdown parser with 100% CommonMark support, extensions & syntax plugins.
Markdown-it is the most popular Self-Hosted alternative to ShowdownJS.
Markdown-it is the most popular Open Source & free alternative to ShowdownJS.
Markdeep is an encompassing JavaScript library for rendering Markdown in the browser. It requires no dependencies and directly supports advanced features like charts and diagrams, fenced code blocks, schedule lists and much more.
Snarkdown is a relatively simple Markdown parser written in JavaScript that's built for speed. It's fast because it's tiny (only 1kb), and uses a single, lengthy but efficient, regular expression for a tokenizer.
Create Markdown documents using JavaScript and Bootstrap themes. Strapdown.js makes it embarrassingly simple to create elegant Markdown documents. No server-side compilation required. Use it to quickly document your projects, create tutorials, home pages, etc.
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Complete tool with no dependencies !