Solution
The Lemmy server appears to have a database limit of 255 characters ^[2]^; however, individual instances appear to put their own limits on username length though the frontend ^[3]^ and/or the API ^[4.1][4.2]^.
Original Post
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
- "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.
- @[email protected] To: ["[SOLVED] What is the maximum username length for a Lemmy account?". "Kalcifer" @[email protected]. "Lemmy Support" [email protected]. sh.itjust.works. Lemmy. Published: 2025-02-03T00:54:51Z. https://sh.itjust.works/post/32085936.]. Published: 2025-02-02T05:57:26Z. Accessed: 2025-02-03T00:44Z. https://sh.itjust.works/post/32085936/16442382.
- They pointed to code on GitHub for the Lemmy server which outlines the length of the username data in the SQL database.
- "[SOLVED] What is the maximum username length for a Lemmy account?". "Kalcifer" @[email protected]. "Lemmy Support" [email protected]. sh.itjust.works. Lemmy. Published: 2025-02-03T00:54:51Z. Accessed: 2025-02-03T00:46Z. https://sh.itjust.works/post/32085936.
- §"Original Post". ¶2.
[…] I did some brute-force testing, and, at least for sh.itjust.works, it seems that the maximum username length is 50 […]
- The maximum username length for sh.itjust.works was found to be 50 characters by brute-force testing the length limit.
- §"Original Post". ¶2.
- "Andrew" @andrew_[email protected] To ["[SOLVED] What is the maximum username length for a Lemmy account?". "Kalcifer" @[email protected]. "Lemmy Support" [email protected]. sh.itjust.works. Lemmy. Published: 2025-02-03T00:54:51Z. https://sh.itjust.works/post/32085936.] Published: 2025-02-02T19:57:49Z. Accessed: 2025-02-03T00:59Z. https://sh.itjust.works/post/32085936/16453656.
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curl -L http://lemmy.world/api/v3/site | jq -r .site_view.local_site.actor_name_max_length(26)- The maximum username length for Lemmy.world was found to be 26 characters via an API request.
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curl -L http://sh.itjust.works/api/v3/site | jq -r .site_view.local_site.actor_name_max_length(50)- The maximum username length for sh.itjust.works was found to be 50 characters via an API request.
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I think you can be an outsider to a particular system, and still be able to provide valuable information about it. Enough to be able to satisfy your own curiosity, and hopefully someone else's too. I can imagine a version of this post where you asked what the max username length was, I gave you a means to find out, and we both went on our way. So you can be 'right person' to comment on a post, but the 'wrong person' when it turns out that your answer isn't going to be fully accepted without digging into someone else's source code. As for who the right person is in that case, there's some overlap with your comment about 'entitlement', so I'll continue there.
I completely agree! It is also illogical to argue otherwise — sort of an appeal to authority, imo.
For clarity, I wasn't claiming that you were incorrect due to your self-professed insufficient level of expertise. I was simply responding to your argument that "it's silly to ask you for advice because you don't use Lemmy" by arguing that your premise is unjustified — your argument is valid; however, I don't think that it's sound. I interpret your logic as follows:
This is a valid argument, as it follows by modus ponens; however, it is unsound, as the premise is not epistemologically justified, as I cannot know, pior to you telling me, what your experience is with Lemmy. Hence why I said:
That was never my argument. I think you know this.
Being reluctant to answer any more questions about a topic doesn't mean I was wrong to provide an initial answer. It just means my bandwidth has been exceeded. If Lemmy was a project I was invested in, and I didn't think your second follow-up question was disingenuous, then it would've been different, but as things were, I resented being given homework about it.
For clarity, it wasn't intended to be disingenuous. I apologize if I gave you that impression. I'm always trying to improve how I interact with others.