get client ip address in express.js

According to this, do following to determine the client ipaddress:

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var ip = (req.headers['x-forwarded-for'] ||
     req.connection.remoteAddress ||
     req.socket.remoteAddress ||
     req.connection.socket.remoteAddress).split(",")[0];
node.js express.js

Using setter in Mongoose

According to mongoose.js doc, it is able to set setters to a field on schema.
However, the doc is not quite detailed and obselete.
Some example:

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var schema=new Schema({
  password:{
    type:String,
    required:true,
    set:hash
  }
})

function hash(plainPwd){
  return require("crypto").createHash("sha1").update(plainPwd).update(secret).digest("hex");
}

Read More
node.js mongoose.js

minimist: a neat cli argv parser

minimist is a lightweight cli argument (command line arguments) parser:

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require('minimist')("-x 3 -y 4 -n5 -abc --beep=boop foo bar baz");

//output:
{ _: [ 'foo', 'bar', 'baz' ],
  x: 3,
  y: 4,
  n: 5,
  a: true,
  b: true,
  c: true,
  beep: 'boop' }
node.js npm