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A question about passwords | characters used in them
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With very few exceptions, yes. There should be no restrictions on characters used/length of password (within reason) if you're storing passwords correctly.
A very high max of something like 500 characters just to make sure you don't get DOSed by folks hitting your endpoint with huge packets of data is about the most I would expect in terms of length restrictions. I'm not a security expert or anything though.
The best way to handle passwords IMO, is to have the browser compute a quick hash of the password, and then the server compute the hash of that. That way the "password" that is being sent to the server is always the same length.