Annotation (COCO) — VS Code Extension

A visual bounding-box editor for COCO annotation files, built as a VS Code extension.

Features

• Visual bounding-box editor — open .coco or .coco.json files directly in VS Code with a custom editor
• Annotate from Explorer — right-click any image file to launch the annotation view
• Supported image formats — PNG, JPG, JPEG, WebP, BMP, GIF

Installation

From a .vsix file

code --install-extension coco-0.1.0.vsix

Or: Extensions sidebar → ... menu → Install from VSIX...

Usage

Open a COCO annotation file

Open any .coco or .coco.json file — the custom editor will launch automatically.

Annotate an image

Right-click any image file in the Explorer and select "Annotate with COCO".

File Format

This extension works with the COCO JSON format. Example structure:

{
  "images": [
    { "id": 1, "file_name": "images/photo.jpg", "width": 640, "height": 480 }
  ],
  "annotations": [
    {
      "id": 1,
      "image_id": 1,
      "category_id": 1,
      "bbox": [x, y, width, height]
    }
  ],
  "categories": [
    { "id": 1, "name": "cat" }
  ]
}

Requirements

• VS Code ^1.85.0

License

MIT