This simple tool allow you to easily compose your tile maps and generate some javascript code that you can copy into your game to generate the tile map. You can find the source code on GitHub. For a quick introduction look at the video below.
This is a very simple html file you can use as a starting point for your projects. To use it just copy it to a folder then update the script
tag to point to your copy of gamequery. You may want to put the javascript code in an external file instead of the inline tag.