massCode is a cross-platform, open-source code snippet manager designed for developers who need a powerful yet simple way to store, organize, and reuse code fragments. Built with Electron, Vue, and CodeMirror, it combines the functionality of premium tools like SnippetsLab and Quiver with a completely free and extensible architecture. Whether you’re a solo developer managing personal scripts or part of a team needing quick access to common utilities, massCode offers a unified interface for snippets across languages and formats. Its rich feature set—including real-time HTML/CSS preview, Markdown with Mermaid diagrams, JSON visualization, and developer utilities—makes it ideal for prototyping, learning, and daily development workflows. The app is available for Windows, macOS, and Linux, with extensions for VS Code and Raycast to integrate seamlessly into your existing toolchain.
What You Get
- Multi-level folder and tag organization - Organize snippets with nested folders and tags for fine-grained categorization; each snippet can contain multiple code fragments (tabs) to group related code in one entry.
- 600+ syntax grammars with CodeMirror - Full syntax highlighting for over 600 languages via GitHub’s Linguist grammar library, with 160+ preloaded for immediate use without configuration.
- Integrated Prettier formatting - Automatically format code snippets with Prettier to maintain consistent styling across all languages and projects.
- Real-time HTML & CSS preview - Live rendering of HTML and CSS snippets with instant visual feedback, ideal for UI prototyping and debugging styles without a browser.
- Full Markdown support with Mermaid diagrams - Write Markdown with syntax highlighting, tables, lists; render dynamic charts and diagrams using Mermaid directly in the editor.
- Presentation mode - Turn a sequence of snippets into an interactive slideshow for teaching, team briefings, or conference talks with seamless transitions between code blocks.
- Mindmap generation from Markdown - Convert Markdown outlines into visual mind maps to structure ideas, plan architectures, or document systems intuitively.
- JSON Visualizer with interactive graph - Explore nested JSON data through an expandable tree view that highlights relationships and structure without manual parsing.
- Beautiful screenshot exports - Export any snippet as a high-quality, themable image with customizable backgrounds and fonts for documentation or sharing.
- Developer utility tools - Built-in text converters (case, slug), crypto functions (hash/HMAC, UUID, password generator), and encoders/decoders for Base64, URL, JSON/TOML/XML/YAML, and color formats.
- VS Code Extension integration - Search and insert snippets instantly from VS Code with a zen-mode interface; save selected code directly to massCode library.
- Raycast Extension integration - Access and insert snippets via Raycast’s quick launcher on macOS for frictionless workflow embedding.
Common Use Cases
- Building a multi-tenant SaaS dashboard with real-time analytics - Use massCode to store reusable HTML/CSS components, JSON response examples from APIs, and Mermaid diagrams of data flows—quickly recall and preview them during development.
- Creating a mobile-first e-commerce platform with 10k+ SKUs - Organize product-specific CSS snippets, JSON schema templates for inventory APIs, and utility functions (slug generators, UUIDs) in categorized folders for rapid iteration.
- Problem: Losing reusable code snippets across projects → Solution: massCode - Developers who copy-paste code between folders or GitHub gists can centralize all snippets in massCode with tags and search, reducing duplication and improving recall.
- DevOps teams managing microservices across multiple cloud providers - Store Terraform snippets, AWS CLI commands, Dockerfile templates, and JSON config examples in structured folders; export them as images for runbooks or Slack sharing.
Under The Hood
MassCode is a desktop application designed to help developers organize and manage code snippets, folders, and tags in a structured way. It provides a rich UI for snippet management with multi-language support and localization capabilities.
Architecture
The project follows a layered architecture with clear separation between the database layer, API routes, and DTOs for data transfer. It uses a monolithic structure with distinct modules for the Electron main process, API handling, and UI components.
- Modular structure separating main process, API routes, database logic, and UI components
- Strong use of DTOs (Data Transfer Objects) for API contracts and data validation
- Clear separation between core logic, database interactions, and user-facing components
Tech Stack
The project is built using a modern web stack with TypeScript and Vue.js for the frontend, integrated with Electron for desktop functionality. It leverages Elysia.js as its backend API framework and includes a variety of UI libraries for rich component design.
- Primary language: TypeScript with Vue 3 for frontend development
- Backend API built with Elysia.js, a lightweight framework for building APIs
- Database interactions handled through a custom DB layer with migrations
- Electron integration for cross-platform desktop application framework
Code Quality
The codebase demonstrates consistent style and structure, with strong typing and a modular organization. While error handling is present, it is not consistently applied across all modules.
- Extensive use of TypeScript types and Elysia DTOs for strong typing and validation
- Code follows a modular structure with clear separation of concerns
- Error handling is present but not uniformly implemented across all modules
What Makes It Unique
MassCode stands out for its structured API design, internationalization support, and integration of Elysia’s schema validation. These features distinguish it from conventional snippet managers.
- Type-safe API design with Elysia’s schema-based validation for robust data contracts
- Modular, reusable DTO patterns that enforce consistency across API resources
- Comprehensive internationalization support with extensive locale file integration
- Cross-platform desktop experience built with Electron while maintaining modular architecture