Scratchext

Scratchext is a framework for making Scratch 2.0 extensions in node.js.

How do I use it?

Clone the scratchext repository into your project directory.

$ cd your/project/directory
$ git clone https://github.com/queryselector/scratchext

Create a manifest file called extension.json. This file contains information about the extension and its blocks.

{
    "extensionName": "HelloWorld",
    "extensionPort": 12345,
    "blockSpecs": [
        [" ", "say hello", "greet"]
    ]
}

Then create extension.js, which contains the extension behavior.

require('./scratchext/scratchext').create({
    blocks: {
        greet: function () {
            console.log('Hello, world!');
        }
    }
});

Run the extension with Node…

$ sudo node extension.js

…and import the extension into Scratch by shift-clicking the File menu, selecting Import Experimental Extension, and choosing extension.json in the file dialog.

Your block will appear in the More Blocks category. Click it to say hello!

$ sudo node extension.js
Connected to Scratch as "HelloWorld", port 12345
Hello, world!

That's it! Check out the wiki for more tutorials and documentation.