Page 8: $ sudo apt-get -y install build-essential g++ libssl-devpkg-config should be $ sudo apt-get -y install build-essential g++ libssl-dev pkg-config

Chapter 3

Page 63: /.+app?le$/ should be /.+ap?le$/.
Page 64: .. will always print "abc*" should be .. will always print "abcd"
Page 76: .. Chapter 6, The Stylus CSS Preprocessor should be Chapter 7: Forms, Cookies, and Sessions.

Chapter 4

Page 79: Although not visible to a the regular user should be Although not visible to a regular user

Chapter 5

Page 115: app.res.globals should be res.globals.
Page 119: p= '© ' + new Date().getFullYear() should be p!= '© ' + new Date().getFullYear()

Chapter 7

Page 187: deletereq.session should be delete req.session.

Chapter 8

Page 189: What the is production environment? should be What is the production environment?
Page 194: var cpu_count = require('os').cpus().length; is redundant.
Page 202: process.process.exit(1) should be process.exit(1)