Learn Blockly - 10 Code Examples & CST Typing Practice Test
Blockly is an open-source visual block-based programming library developed by Google. It allows developers to embed a drag-and-drop block coding editor inside web or mobile apps, enabling users to create logic visually without writing text code.
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Learn BLOCKLY with Real Code Examples
Updated Nov 25, 2025
Learning Path
Learn Blockly basics
Understand XML toolbox configuration
Customize blocks and categories
Add code generators
Build full no-code apps
Skill Improvement Plan
Week 1: Embed Blockly
Week 2: Toolbox customization
Week 3: Custom blocks
Week 4: Code generators
Week 5: Themes and plugins
Interview Questions
What is Blockly and who created it?
How does Blockly generate code?
Difference between toolbox and workspace?
How do you create custom blocks?
Compare Blockly with Scratch or Node-RED.
Cheat Sheet
Blockly.inject() -> create workspace
workspaceToCode() -> generate code
XML -> save & load workspace
Custom blocks via Blockly.Blocks
Generators via Blockly.JavaScript / Python
Books
Blockly Essentials
Building Visual Programming Tools with Blockly
No-Code App Development with Blockly
Blockly for Education
Custom Blocks and Generator Design
Tutorials
Embedding Blockly in a web page
Creating custom blocks
Generating JavaScript code
Saving and loading workspace
Building no-code apps with Blockly
Official Docs
https://developers.google.com/blockly
https://github.com/google/blockly
Community Links
Blockly GitHub Discussions
Google Developer Groups
StackOverflow - Blockly tag
YouTube Blockly tutorials
Community plugins and forks
Community Support
Google Blockly forums
GitHub discussions
StackOverflow
Blockly developer samples
Open-source community plugins
Frequently Asked Questions about Blockly
What is Blockly?
Blockly is an open-source visual block-based programming library developed by Google. It allows developers to embed a drag-and-drop block coding editor inside web or mobile apps, enabling users to create logic visually without writing text code.
What are the primary use cases for Blockly?
Educational coding tools. Visual workflow builders. Robotics interfaces. No-code/low-code platforms. Logic editors for AI/automation apps
What are the strengths of Blockly?
Highly customizable and embeddable. Can generate real executable code. Supports complex logic visually. Great for education and no-code tools. Large community and Google backing
What are the limitations of Blockly?
Requires developer setup (not plug-and-play like Scratch). Must design your own blocks for advanced use. Generated code may need cleanup. Not ideal for very large programs. Performance may drop with huge workspaces
How can I practice Blockly typing speed?
CodeSpeedTest offers 10+ real Blockly code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.