If you're wondering how to implement this, here's a quick example to get you off the ground. Make your own custom copy of MatterRenderer (as liabru stated). Then in the render.bodies function there is a loop that is responsible for rendering each individual body (should be around line 616) include the following at the end immediately after c.globalAlpha = 1; (around line 706)

c.globalAlpha=1;
//Here's the custom part
if(part.render.text)
{
	//30px is default font size
	var fontsize = 30;
	//arial is default font family
	var fontfamily = part.render.text.family || "Arial"; 
	//white text color by default
	var color = part.render.text.color || "#FFFFFF";

	if(part.render.text.size)
		fontsize = part.render.text.size;
	else if(part.circleRadius)
		fontsize = part.circleRadius/2;

	var content = "";
	if(typeof part.render.text == "string")
		content = part.render.text;
	else if(part.render.text.content)
		content = part.render.text.content;

	c.textBaseline="middle";
	c.textAlign="center";
	c.fillStyle=color;
	c.font = fontsize+'px '+fontfamily;
	c.fillText(content,part.position.x,part.position.y);
}

Then in your code instead of importing Matter.Renderer import your custom renderer, and use as follows :

//an example using a circle
Bodies.circle(x,y,circleSize,{
	restitution:0.95,
	friction:0.05,
	density:0.0005,
	render:{
		fillStyle:"#C44D58",
		text:{
			content:"Test",
			color:"blue",
			size:16,
			family:"Papyrus",
		},
	},
});

Or you can just set render.text to a string and the rest will be set to the defaults we defined in the custom renderer.

This is an overly simplified solution and the following issues still exist

There is no wrapping or automatic sizing of text - we can't measure text so we can't guarantee it won't overflow.
For similar reasons we can't be sure the text will be centered perfectly.

Is there anyway to render text in Matter.js? #321

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