Markdown Editor

Overview

Create a real-time Markdown editor with a side-by-side editing and preview pane. As the user types Markdown, the preview updates instantly. Add toolbar buttons for common formatting, file save/load via localStorage, and export capabilities.

Markdown editors are one of the most practical portfolio projects because every developer uses Markdown daily for README files, documentation, and note-taking. Building one from scratch demonstrates that you understand text processing pipelines, real-time rendering, and security concerns like XSS prevention through HTML sanitization.

The technical challenges are deceptively rich. You need to debounce the parsing to avoid blocking the main thread on every keystroke, implement a resizable split-pane layout with drag-to-resize, synchronize scroll positions between two panes with different content heights, and handle cursor position preservation when toolbar buttons inject formatting syntax. Each of these is a practical skill that transfers to other editor-style applications.

Interviewers appreciate this project because the scope is clear, the result is immediately usable, and the implementation reveals your frontend engineering depth. Discussions about debouncing vs throttling, XSS prevention, Web Workers for heavy computation, and collaborative editing extensions give you rich material for technical conversations.

Interview questions

• Should I build my own Markdown parser?
• How do I implement scroll sync?
• How do I handle large documents?
• What security concerns exist?
• How do I preserve cursor position when toolbar buttons insert formatting?
• How do I implement the tab key for indentation?

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