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markjason-landing

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Landing page for markjason - a lightweight Markdown & JSON editor for macOS

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# markjason

<br>

**The fastest way to read specs, edit prompts, and manage configs.**

*Built for the only human tasks left in agentic coding.*

<br>

[Website](https://markjason.sh) · [Download](https://markjason.sh/#download) · [Report Issue](https://github.com/gijsverheijke/markjason-landing/issues)

<br>

</div>

---

## What is markjason?

A stupidly fast macOS app for Markdown, JSON, env, text, and source files.

If you work with AI and accumulate specs, configs, prompts, logs, and source files, you know the pain: opening a heavyweight IDE just to inspect one file, waiting for Electron apps to boot, or fighting with cluttered file browsers.

markjason is the antidote:

- ⚡ **Fast** — Native Swift, no Electron.
- 🎯 **Focused:** A single-file editor for the text and code files around your work, not another IDE.
- 🌙 **Dark mode only** — As nature intended.
- 💾 **Auto-save** — With clear feedback. Never lose work.
- 📁 **Lots of carefully crafted details** For the vibes.

---

## Install

1. **[Download the DMG](https://github.com/gijsverheijke/markjason-landing/releases/download/0.35/markjason-0.35.dmg)**
2. Drag markjason to Applications
3. Open and enjoy

---

## Features

### Open more of the files around your code
- Press ⌘O to open Markdown, JSON, env, text, and source-code files
- Supported source formats receive syntax highlighting
- Files with uncommon extensions open as plain text or detected JSON when their UTF-8 content is valid
- Binary and invalid text is rejected safely
- More reliable opening and retry behavior for iCloud and other macOS File Provider files

### Realtime updates
- Your agent edits AGENTS.md while you have it open? Boom, it's there in markjason
- You and your agent are editing at the same time and something drifts? Instant warning

### Uniquely crafted for vibecoding
- See full filepath and ballpark token count of the file with ⇧⌘I 
- Insta-copy filename with ⌃⌘C so you can paste it into your terminal
- Insta-copy markdown as image to share on messaging
- One-click copy of env keys and values to paste them to your other envs
- FAST! and low RAM (~1/5th of VS Code i.e. ~100megs)

### For Markdown
- Read mode toggle (⌘E)
- Task list checkboxes — `- [x]` and `- [ ]` render as proper checkboxes with strikethrough
- Syntax highlighting and persistent edit-mode font sizing from 10pt to 24pt
- Bold, italic, links, code formatting (⌘B, ⌘I, ⌘L, ⇧⌘C)
- Copy rendered preview as image (⇧⌘C in read mode)
- Markdown syntax guide (⇧⌘M)

### For JSON
- Real-time validation
- Jump to error location (⌥⌘J)
- Collapsible tree view in read mode
- Pretty formatting
- Sort keys alphabetically (⇧⌘K)
- Breadcrumb navigation — click any node, see the full path
- Copy JSON Pointer — right-click any value to copy its path
- Smart Paste — paste minified or broken JSON, it auto-formats and repairs
- Multi-line string editor — edit long string values inline in read mode

### For .env
- Clean key-value display
- One-click copy of keys and values

### Navigation
- **Outline panel (⌘⇧O)** — all headings as a clickable table of contents, highlights your current section as you scroll, Ctrl+Up/Down to jump between headings
- Sidebar file browser with pinned files (⌘D)
- Quick Open (⌘K) — fuzzy search across all recent files and tabs
- Tabs with drag reordering (⌘1-9 to switch)

---

## Keyboard Shortcuts

### Most Used
| Shortcut | Action |
|----------|--------|
| ⌘E | Toggle Preview/Raw mode |
| ⌘N | New file |
| ⌘⇧N | New from Clipboard |
| ⌘W | Close tab |
| ⌘/ | Show all shortcuts |
| ⌘+ / ⌘− | Increase / decrease editor text size |
| ⌘0 | Reset editor text size to 14pt |

### Navigation
| Shortcut | Action |
|----------|--------|
| ⌘K | Quick Open |
| ⌘⇧[ | Previous tab |
| ⌘⇧] | Next tab |
| ⌘1-9 | Switch to tab 1-9 |
| ⌃⌘S | Toggle sidebar |

### Editing (Markdown)
| Shortcut | Action |
|----------|--------|
| ⌘B | Bold (**text**) |
| ⌘I | Italic (*text*) |
| ⌘U | Underline |
| ⇧⌘X | Strikethrough |
| ⌘L | Insert link |
| ⇧⌘C | Inline code (\`code\`) |
| ⌥⇧⌘C | Code block |

### JSON
| Shortcut | Action |
|----------|--------|
| ⇧⌘K | Sort JSON keys (A→Z) |
| ⌥⌘J | Jump to JSON error |

### Files
| Shortcut | Action |
|----------|--------|
| ⌘O | Open file |
| ⌘S | Save |
| ⌘⇧S | Save As... |
| ⌘D | Toggle pin |
| ⌘F | Find in file |
| ⇧⌘I | Show file info |
| ⌃⌘C | Copy filename |

### JSON-specific
| Shortcut | Action |
|----------|--------|
| ⌥⌘J | Jump to JSON error |

---

## Design and UX

markjason's dark interface is meant to be easy on the eyes, and optimized for focus.

The logo `#{}` is a mashup of:
- `#` — Markdown heading syntax
- `{}` — JSON object syntax

Indicators in markjason are inspired by the Apollo Command Module. A warm, vintage light. I love them and I hope you will too.

---

## Requirements

- macOS 14.0 (Sonoma) or later
- Apple Silicon or Intel

---

## Why is this repo the landing page?

markjason itself is not open source. This repo hosts the landing page and the DMG releases. The setup is like this so the app can be completely free without any hosting costs (GitHub handles the downloads).

If you're interested in the source or want to contribute, feel free to open an issue or DM.

---

## About

Created by [Gijs Verheijke](https://gijs.substack.com) for people who read too many AI outputs.

Built with Swift and SwiftUI. No Electron. No dependencies. No drama.

---

## Feedback

Found a bug? Have a feature request?

→ [Open an issue](https://github.com/gijsverheijke/markjason-landing/issues)

---

**[markjason.sh](https://markjason.sh)**

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