Where Are Melatonin Save Files Located?
Melatonin keeps progress as plain JSON files inside its own install folder, not in AppData or Documents.
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Melatonin stores progress as .json files directly inside its install folder, which Steam Cloud syncs. There is no AppData folder and no Documents folder to check. That surprises everyone, because almost every Unity game uses LocalLow instead.
The practical rule: treat the install folder as the save folder. Back up the .json files before verifying game files or reinstalling, since Steam happily overwrites them. macOS builds follow the same install-relative layout. Uninstalling wipes progress unless Steam Cloud already synced it, so back up first.
Where Melatonin stores this, by platform
<Steam>\steamapps\common\Melatonin
Progress as .json in the install root, synced by Steam Cloud under app ID 1585220. Sort by date to spot your saves. Back them up before verifying files or reinstalling.
<Steam>/steamapps/common/Melatonin
Same install-relative JSON layout as Windows. Find the folder through Steam (Manage > Browse local files) rather than guessing under Library.
Frequently asked questions
Which files in the Melatonin folder are my saves?
Sort the install folder by date modified. The newest .json files are your progress. Copy those plus any level-editor files before verifying game files, since verification can overwrite them.
Does Melatonin work the same on Steam Deck?
Yes, it is Deck Verified and the same install-folder JSON layout applies through Proton. The files sync through Steam Cloud, so progress follows your account between PC and Deck.
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