CJB Item Spawner lets you press i on your keyboard (configurable) to open a menu to spawn items:

For non-English players, translations are included in the base mod. Contributions are welcome!

Install the latest version of SMAPI.
Download this mod and unzip it into Stardew Valley/Mods.
Run the game using SMAPI.

If you play on Android, use the optional download on the files tab instead of the latest version.

Load your save, then press the letter i on your keyboard to show the item spawner menu. Change item quality by clicking the [☆] quality button at the top.

To change the button, see key bindings on the wiki. (It covers Android too.)

If the menu doesn't open, see the pinned comment on the Posts tab.

Compatible with...
- Stardew Valley 1.5 or later;
- Linux, macOS, and Windows;
- single-player and multiplayer.
No known mod conflicts.

Source code
Release notes
Originally created by CJBok (maintained by Pathoschild since 2017)