# scratchfoundation/scratch-blocks

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2,750 stars · 1,534 forks · JavaScript · Apache-2.0

## Links

- GitHub: https://github.com/scratchfoundation/scratch-blocks
- Homepage: https://scratch.mit.edu/developers
- awesome-repositories: https://awesome-repositories.com/repository/scratchfoundation-scratch-blocks.md

## Description

Scratch-blocks is a block-based visual programming library and framework used to create graphical programming interfaces. It provides a visual environment that translates interlocking blocks into executable code, serving as a foundation for educational coding interfaces and visual programming languages.

The project is implemented as a customized extension of the Google Blockly ecosystem. It enables the development of domain-specific languages through a drag-and-drop interface, supporting the creation of custom block libraries and no-code tool development.

The framework handles the structural mechanisms of block-based systems, including constraint-based snapping, coordinate-based positioning, and event-driven input. It manages program state through JSON-based serialization and uses schema-driven definitions to determine block appearance and connectivity.

## Tags

### Education & Learning Resources

- [Educational Programming Environments](https://awesome-repositories.com/f/education-learning-resources/learning-platforms-infrastructure/educational-infrastructure/educational-tools/educational-programming-environments.md) — Serves as a foundation for integrated platforms that teach software development concepts through visual block editors.

### Part of an Awesome List

- [Block-Based Visual Interfaces](https://awesome-repositories.com/f/awesome-lists/devtools/block-based-visual-interfaces.md) — Implements a drag-and-drop interlocking block editor for building logic without manual coding.

### Development Tools & Productivity

- [Blockly Extensions](https://awesome-repositories.com/f/development-tools-productivity/blockly-extensions.md) — Implemented as a specialized extension of the Google Blockly ecosystem for educational scripting.
- [Visual Programming Tools](https://awesome-repositories.com/f/development-tools-productivity/platforms-runtimes-language-services/development-platforms/low-code-visual-builders/visual-programming-tools.md) — Provides an environment for creating graphical programming interfaces that define application logic through interlocking blocks. ([source](https://scratch.mit.edu/developers))
- [Visual Block Designers](https://awesome-repositories.com/f/development-tools-productivity/visual-block-designers.md) — Provides an interface for designing specialized graphical components that represent specific functions in a visual language.
- [Visual Language Frameworks](https://awesome-repositories.com/f/development-tools-productivity/visual-language-frameworks.md) — Provides a framework for defining the shapes, behaviors, and input fields of custom blocks for domain-specific languages.
- [No-Code Platforms](https://awesome-repositories.com/f/development-tools-productivity/no-code-platforms.md) — Enables the development of software that allows non-programmers to build complex workflows using a visual block system.

### Programming Languages & Runtimes

- [Block-Based Code Generators](https://awesome-repositories.com/f/programming-languages-runtimes/block-based-code-generators.md) — Translates visual arrangements of interlocking blocks into executable source code for beginners and students.
- [Block-Based Coding Libraries](https://awesome-repositories.com/f/programming-languages-runtimes/block-based-coding-libraries.md) — Provides a comprehensive framework for creating visual programming languages that translate block arrangements into executable code.

### Software Engineering & Architecture

- [Visual Block Schemas](https://awesome-repositories.com/f/software-engineering-architecture/configuration-driven-schemas/visual-block-schemas.md) — Uses configuration-driven schemas to define the visual appearance and connectivity rules of programming blocks.
- [JSON Serializers](https://awesome-repositories.com/f/software-engineering-architecture/abstract-syntax-tree-tools/internal-tree-representations/json-serializers.md) — Converts nested block hierarchies into structured JSON trees for saving and loading program state.

### User Interface & Experience

- [Workspace Coordinate Management](https://awesome-repositories.com/f/user-interface-experience/coordinate-based-position-calculators/workspace-coordinate-management.md) — Manages a global 2D workspace coordinate system for free-form movement, zooming, and panning of visual blocks.
- [Event-Driven Input Handlers](https://awesome-repositories.com/f/user-interface-experience/form-and-input-management/input-handling/event-driven-input-handlers.md) — Utilizes a centralized event system to map mouse and keyboard inputs to mutations of visual programming blocks.
- [Block Snapping Logic](https://awesome-repositories.com/f/user-interface-experience/snap-points/block-snapping-logic.md) — Implements constraint-based snapping to ensure programming blocks align correctly during drag-and-drop interactions.