If you know, please also provide relevant documentation.

UPDATE (2025-02-02T06:06Z): I did some brute-force testing, and, at least for sh.itjust.works, it seems that the maximum username length is 50, and the maximum password length is 60 [1].

References
  1. “Sign Up”. sh.itjust.works. Lemmy. Accessed: 2025-02-02T08:49Z. https://sh.itjust.works/signup.
    • When creating an account on sh.itjust.works, the sign-up form will throw this error if the provided password is greater than 60 characters in length.
  • slazer2au@lemmy.worldEnglish
    1·
    12 hours ago

    It’s up to the UI as to how much data to accept AFAIK. The lemmy-ui will truncate passwords beyond 60. So even if you have a 64 char password it will drop the last 4 and do the hashing on that.

    • KalciferOPEnglish
      3·
      12 hours ago

      […] The lemmy-ui will truncate passwords beyond 60. So even if you have a 64 char password it will drop the last 4 and do the hashing on that.

      At least on sh.itjust.works, it doesn’t just silently truncate the password; it throws an error [1]:

      References
      1. “Sign Up”. sh.itjust.works. Lemmy. Accessed: 2025-02-02T08:49Z. https://sh.itjust.works/signup.
        • When creating an account on sh.itjust.works, the sign-up form will throw this error if the provided password is greater than 60 characters in length.