Request Parameters
Session Data
Uploading Files
Embedded JavaScript
Templates
Modules
Reading Files
Sending Requests
API

Include Module:

let fs = require(`fs`)

Read File:

let contents = fs.readFileSync(yourFile, `utf8`)

// write code here to do something with the file contents
// you can split the contents into separate lines with contents.split(/\r?\n/)

More Info: module page