A free mod for Stardew Valley, by aedenthorn.
You can use this mod to quickly and easily edit your maps while in-game. It allows you to change existing tiles on the map to another tile in the same location.
It works by selecting a tile on the map, then scrolling down or up to select a different tile. The hotkeys for the scroll wheel and buttons are set by default, but you can change them from the settings.
There are two types of JSON files you can use:
The first one is per-save, which will save your edits and any other changes you make to a file. It will create a subfolder in the data folder of the mod.
The second one is global, and it will work on all the saves. It will create a subfolder in the mod folder. This is then divided into custom or single global.
The mod will work on all farm types and custom maps.