Originally a snippet manager, massCode has evolved into a local-first developer workspace that brings together reusable code, Markdown notes, API work, calculations, drawings and assorted programming utilities.
Snippets, notes and HTTP requests are stored as plain Markdown files with frontmatter metadata, making the vault readable outside the application and suitable for version control or synchronisation with other tools.
Development of massCode now makes substantial use of AI coding agents.
This is free and open source software.
Key Features
- Organize code snippets with multi-level folders, tags and multiple fragments.
- Provide more than 160 syntax grammars out of the box, with support for hundreds more through .tmLanguage files.
- Format code with Prettier, preview HTML and CSS, visualize JSON structures and export snippets as images.
- Create Markdown notes with task management, editable tables, internal links, callouts, Mermaid diagrams, mind maps, presentation mode and a notes graph.
- Send HTTP and GraphQL requests, exchange WebSocket messages, use environments and variables, run assertions and JavaScript tests, and generate request code.
- Import API collections from OpenAPI, Postman and Bruno.
- Use a math notebook for arithmetic, unit conversions, date calculations, currencies, functions and finance calculations.
- Create Excalidraw-powered drawings and embed them in notes.
- Access built-in developer utilities for hashing, HMACs, UUIDs, passwords, encoders, format conversion and text manipulation.
- Search workspaces and run common actions from a keyboard-driven command palette.
- Import snippets and notes from supported applications and clip content from web browsers into the local vault.
Website: github.com/massCodeIO/massCode
Support:
Developer: Anton Reshetov
License: GNU Affero General Public License v3.0
massCode is written in TypeScript. Learn TypeScript with our recommended free books and free tutorials.
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| massCode | Local-first developer workspace |
| The Way | Code snippets manager written in Rust |
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| boom | Manages your text snippets on the command line |
Read our verdict in the software roundup.
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