How to Build an Image Annotation Tool with JavaScript Canvas

Image annotation tools are used for labeling training data in machine learning, reviewing medical images, and marking up photos for feedback. Konva.js makes it easy to build these tools because of its built-in drag-and-drop, shape drawing, and event handling on canvas.

This demo shows a working image labeling system built with React and react-konva. Read the full case study about the development process.

The widget is made with React, Konva and react-konva libraries.

It is not required to use React for such apps. But it was used here because the main application (where the system was used) is made with React.