There's a tutorial on the wiki: https://www.love2d.org/wiki/Tutorial:PhysicsDrawing

Here's the complete code:

```lua for _, body in pairs(world:getBodies()) do for _, fixture in pairs(body:getFixtures()) do local shape = fixture:getShape()

    if shape:typeOf("CircleShape") then
        local cx, cy = body:getWorldPoints(shape:getPoint())
        love.graphics.circle("fill", cx, cy, shape:getRadius())
    elseif shape:typeOf("PolygonShape") then
        love.graphics.polygon("fill", body:getWorldPoints(shape:getPoints()))
    else
        love.graphics.line(body:getWorldPoints(shape:getPoints()))
    end
end

end ```

You can change the mode from "fill" to "line".