Dropbox's zxcvbn[1] seems to do a good job of this along with detecting sequences and keyboard patterns. [1] https://github.com/dropbox/zxcvbn https://github.c

Dropbox's zxcvbn[1] seems to do a good job of this along with detecting sequences and keyboard patterns. [1] https://github.com/dropbox/zxcvbn https://github.com/dropbox/zxcvbn