What kind of code is this JSON for creating an image?

This is just a standard JSON format! It represents a grid of pixels, where each pixel’s position is defined by its column and row, and the color is specified as well. You’re right that it creates an image when decrypted. It’s data more than code, really. If you want to visualize it, you might consider using something like jq to make it easier to read, though it's pretty straightforward as it is. Just keep in mind, without extra context, there isn't much else to analyze here.

Honestly, the whole thing looks like a yellow square to me! If you're trying to draw it, each {"col":X,"row":Y} entry tells where to place a colored pixel. It's common to see data set up like this for graphics projects.

If you're tasked with drawing this image, all you need to do is parse it. Each entry shows the coordinates of pixels in a grid, along with the color value. You’ll want to use some programming language to handle that data and display it on the screen.