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# couch_peruser [](https://travis-ci.org/apache/couchdb-peruser)
couch_peruser is a CouchDB daemon that ensures that a private per-user
database exists for each document in _users. These databases are
writable only by the corresponding user. Databases are in the form:
userdb-{hex encoded username}
For example, the user `bob` will have a database named `userdb-626f62`.
The reason for hex encoding is that CouchDB usernames have no restrictions,
but CouchDB databases have restrictions. Hex encoding the UTF-8
representation of the username is a transformation that's easy to
correctly implement in just about any language, especially JavaScript
and Erlang. Other encodings would be possible, but would require
additional client and server-side code to support that encoding. This
is the simplest scheme that is obviously correct.
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