You can paste a markdown file with JavaScript snippets here, see it rendered with the JS highlighted next to your text, and share it through a link that opens without an account.
Front-end and Node developers write a surprising amount of JavaScript that never lands in a repository: a reproduction for a bug report, a proposed fix pasted into a pull request description, a snippet explaining how a promise chain resolves, a handoff note for whoever picks up the ticket next. Chat tools tend to flatten that kind of message. Triple backticks may survive, but tables, nested lists and headings often do not, and a long callback ends up as one gray block that nobody reads carefully.
Opening the same text here gives it structure. The prose gets real headings and lists, and the JavaScript is shown with keywords, strings, template literals and comments in distinct colors, which makes it easier to spot a missing await or a variable that shadows another. Split view on a laptop lets you edit the markdown on the left while checking the result on the right.
When you are done, Share creates a read-only page and a separate edit link. Send the read-only one to reviewers and keep the edit link to yourself. The page is reachable only through its URL, is not indexed by search engines, and expires automatically after 15 days. Code is displayed, never run in the browser of whoever opens it.
How to view JavaScript in markdown
- Paste your markdown into the editor above, or edit the example.
- Wrap JavaScript code in a fenced block that starts with ```javascript.
- The preview shows the rendered document with the code highlighted (side by side on desktop; switch to Preview on a phone).
- Select Share to get a read-only link that anyone can open without an account.
Frequently asked questions
Does the short js tag work?
Yes. Both ```javascript and ```js get JavaScript highlighting. Tags that are not registered, for example ```jsx or ```mjs, display the code as plain monospaced text.
Is the JavaScript in a document executed when someone opens it?
No. Code blocks are treated as text to display with colors. Raw HTML and script tags written outside a code block are not rendered either; they appear as text.
Will highlighting survive if I export the document?
Export .md gives back your original markdown. Export .html produces a single self-contained file, but code blocks in that file are not syntax-highlighted, so for colored code send the read-only link instead.