A drawing app is a classic project that brings together many core skills you have learned about the canvas. In this app, you give users the ability to draw freeform lines directly on the canvas using the mouse. By responding to mouse events, you can let users sketch, doodle, or even create more complex artwork. Useful features often include changing the color or thickness of the lines, and providing a button to clear the canvas so users can start over. These features make the app interactive and engaging, while also giving you hands-on practice with canvas drawing, event handling, and UI controls.

To make your drawing app more flexible and fun, you can let users change the color and thickness of the lines. You do this by updating the strokeStyle property for color and the lineWidth property for thickness before drawing. For example, you might use color pickers or sliders in your user interface to let users select their preferences, and then update these properties on the canvas context before each stroke. If you want to provide a way to clear the canvas, simply call ctx.clearRect(0, 0, canvas.width, canvas.height) when the user clicks a Clear button. This erases everything, giving users a fresh start.