massCode Development

A free, open-source code snippet manager to create, organize, and instantly access your personal snippet library.

Organization

Organize your snippets with multi-level folders and tags. Each snippet can contain multiple fragments (tabs), giving you fine-grained control over structure and grouping.

Editor

Built on CodeMirror with .tmLanguage grammars for syntax highlighting.

Supports over 600 grammars, with 160+ available out of the box.
Integrated Prettier for clean, consistent code formatting.

Real-time HTML & CSS Preview

Write and instantly preview HTML and CSS snippets. Perfect for prototyping, testing ideas, or quick visual checks.

Markdown

Full Markdown support with syntax highlighting, tables, lists, and more.

Integrated Mermaid for dynamic diagrams and charts.

Presentation Mode

Turn a sequence of snippets into a presentation. Useful for classrooms, team meetings, conference talks, or simply walking through your own notes.

Mindmap

Generate mind maps from Markdown. Fast, intuitive, and ideal for structuring and visualizing ideas.

JSON Visualizer

Visualize and explore your JSON data with an interactive graph view. Perfect for quickly inspecting complex responses, APIs, or configuration files.

Beautiful Screenshots

Export snippets as polished images with customizable themes and backgrounds.

Developer Tools

Handy built-in utilities for everyday dev tasks:

Text Tools: Case Converter, Slug Generator, URL Parser
Crypto & Security: Hash/HMAC, Password Generator, UUID
Encoders/Decoders: URL, Base64, JSON ⇄ TOML/XML/YAML, Text ⇄ ASCII/Binary/Unicode, Color Converter

Integrations

Extend your workflow with:

VS Code Extension: zen mode snippet search, instant insertion, and save selected code as snippets.
Raycast Extension: quick snippet access directly from Raycast.

Thanks for supporting massCode 🙏