{"id":14524,"date":"2026-09-24T10:32:02","date_gmt":"2026-09-24T10:32:02","guid":{"rendered":"https:\/\/playgama.com\/blog\/?p=14524"},"modified":"2026-09-24T10:32:02","modified_gmt":"2026-09-24T10:32:02","slug":"how-to-handle-corrupted-save-files-migration-and-versioning","status":"publish","type":"post","link":"https:\/\/playgama.com\/blog\/business-faqs\/how-to-handle-corrupted-save-files-migration-and-versioning\/","title":{"rendered":"How to handle corrupted save files, migration, and versioning in web games?"},"content":{"rendered":"

Wrap every load in try\/catch, validate structure before use, store a version number in each save, write migration functions that step version-to-version, and always keep safe defaults so a corrupted or missing save never blocks the game from starting.<\/strong><\/p>\n

At a glance<\/h2>\n\n\n\n\n\n\n\n
Fact<\/th>\nValue<\/th>\nSource<\/th>\n<\/tr>\n<\/thead>\n
Save format should include an explicit version field<\/td>\ninteger or semver<\/td>\n<\/td>\n<\/tr>\n
Load path must handle missing or malformed keys<\/td>\nreturn defaults<\/td>\nwiki.playgama.com<\/a><\/td>\n<\/tr>\n
Web Storage API underlies most browser save systems<\/td>\nlocalStorage\/IndexedDB<\/td>\ndeveloper.mozilla.org<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Treat every save read as untrusted input. Parse it inside try\/catch, check that required fields exist and have sane types, and if anything fails revert to default values rather than throwing: keep defaults ready so gameplay continues, never a blank screen. Store a version number inside the save object itself (e.g. {version: 3, coins: 120, level: 7}<\/code>) so your load code can tell which shape the data is in.<\/p>\n

A simpler way to avoid most of this: use Playgama Bridge<\/a>‘s Storage module, which persists progress, settings, currency and level state and picks the right storage location, including cloud saves, automatically. Load with bridge.storage.get([...])<\/code> before gameplay – missing keys return null, so keep defaults ready – and call bridge.storage.set(...)<\/code> only on meaningful changes (level complete, purchase, settings change), not every frame. The docs warn against saving directly to localStorage or engine-native persistence (PlayerPrefs, local files), since that data won’t reach cloud saves.<\/p>\n

How do I migrate old save formats?<\/h2>\n