CJB Cheats Menu lets you press P (configurable) to show a full cheats menu:

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

Load your save, then press P on your keyboard to show the cheats menu. Press the button when no in-game menu is shown.

To change the button:

On Linux/macOS/Windows, open the menu and then use the "Controls" tab to choose a different controller/keyboard/mouse button. (You can also change config.json directly if needed.)
On Android, see use key bindings on Android.

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

Is the mod still compatible?

The mod is compatible with Stardew Valley 1.5.5 or later on Linux/macOS/Windows, both single-player and multiplayer.

Does the mod work in multiplayer?

Yep, all the cheats should work in multiplayer (except changing the time if you're a farmhand). The mod is local, so it's fine if only some players have it (whether they're the host or farmhands).

These cheats will affect all players: changes to the world (like changing the date or completing the community center), instant buildings, fast machines, harvest with sickle, adding money (if money is shared), durable fences, auto-feed, auto-pet, infinite hay, setting tomorrow's weather, and time. These cheats will affect players in the same location as you: one-hit kill and one-hit break. Otherwise cheats will mostly only affect you.

Other players usually won't see that you're using cheats (except indirectly, like seeing you zoom across the screen with the speed cheat). However, they might install mods that specifically detect your installed mods.

Does the mod conflict with any others?

Can you remove the limit on daily NPC dialogue?

Nope. Due to the way dialogue works in the game, NPCs would just repeat the same lines anyway. (The mod does remove the gift limit though.)

Can you add custom skills/professions to the list?

Not currently. Custom skills are hard to support due to how they work in the game. It's something I want to look into for future versions, though it's low-priority since it'll probably require changes to all the skill mods too.

Can the mod be used in split-screen mode?

Yep. You can edit the key binding to add a controller keybind. For example, if you do this:
"OpenMenuKey": "P, LeftShoulder + ControllerB",Then the main player can press P to open the menu on their screen, and the other players can press left shoulder + B on their controller to open it on theirs.

Main links: