Markdown vs. Marked: One Is a Language, One Is a Parser—Here's How to Use Both

Front-end developers routinely confuse the two, and the distinction shapes how content pipelines are built. Knowing that Marked is a parser—not a language—saves wasted time hunting for a Markdown interpreter or expecting Markdown itself to render HTML, and it flags the security gap of unsanitized user-supplied Markdown.

Names collide in the front-end world: Markdown and Marked sound interchangeable, but they sit on opposite sides of the content pipeline. Markdown is a lightweight markup language for structuring text with symbols, while Marked is a JavaScript library that converts that Markdown text into HTML. The distinction matters because they are not competing alternatives—they work together.

A typical flow starts with Markdown-authored content, passes it through `marked.parse()`, and serves the resulting HTML to the browser. Marked ships as an npm package and targets JavaScript environments, whereas Markdown itself has no dependency on any language. The choice is a question of role: write content in Markdown, parse it with Marked when the project runs on JS.

One practical warning stands out: Marked does not sanitize HTML by default. Any Markdown coming from user input can carry malicious tags or scripts into the generated HTML. The article recommends piping the output through DOMPurify before inserting it into the page, with the decision to sanitize hinging on the content's source and display context.