Because "alts.json" is a generic naming convention, its purpose varies significantly across different platforms:
In the world of Minecraft "hacked" clients or mod managers, an alts.json file is often used by an Alt Manager . It stores a list of a user's alternative accounts (usernames and session tokens) so they can switch between them quickly without restarting the game. alts.json
As a JSON file, it typically contains key-value pairs. A snippet for an accessibility-focused file might look like this: Because "alts
Developers use alts.json to store alt-text (alternative text) for images. For instance, in some media library extensions, this file maps image filenames to their corresponding accessibility descriptions, allowing a website to inject alt attributes dynamically. A snippet for an accessibility-focused file might look
Some desktop applications use this file to save "generated alts"—accounts or keys pulled from an external API (like KingGen) for testing or other purposes.
Alternatively, a gaming account manager might use it to store credentials or session IDs: