index.js

var levelup = require('levelup')
var leveljs = require('level-js')
var sublevel = require('subleveldown')
var dat = require('dat-core')

var db = levelup('example', { db: leveljs })
var storage = sublevel(db, 'dat', { valueEncoding: 'json' })
var example = dat(storage)

example.put('hello', { message: 'world' }, function () { // insert value
  example.get('hello', function (err, result) {
    console.log('result:', result)   // prints result
    console.log('db.head:', example.head) // the 'head' of the database graph (a hash)
  })
})