note.txt

Error Handling

chicken.fly() //Error //"chicken is undefined" + trace error
throw new Error("Error") //"error" + trace error
//express with throw a default html page error

//custom error handler, both error will hit our custom error handler below
app.use((err, req, res, next) => {
    console.log(err)
    next(err) // pass to the next error handling middleware//next()
})

development

production

find how to print the session ish to console

How to run in production
>>>>>>NODE_ENV=production node app.js

mongo sanitize remove special characters
mongo injection, querying the db
xss making your script run on someone else website