Legitimate username checkers function by interacting with Discord’s API to see if a specific string of characters is currently registered to a user.
Username Checker — Check Availability Across 30+ Platforms
The script sends a request to the Discord API—specifically the pomelo-attempt or users/@me endpoint—to check the status of each username.
For developers interested in the concept , a legitimate approach is:
What this is
.rar files shared on forum posts, YouTube videos, or Discord servers themselves.