iterator.js

function iterate (db, onnode, done) {
  visit(db, [], onnode, cb)
}

function visit (db, path, onnode, cb) {
  var val = 0
  loop(null)

  function loop (err) {
    if (err) return cb(err)
    if (val > 4) return cb(null)

    var next = path.concat(val++) 
    db.get('', {path: next, prefix: true}, function (err, nodes) {
      if (err) return cb(err)

      for (var i = 0; i < nodes.length; i++) {
        var node = nodes[i]
        if (node.path.join('') === next.join('')) onnode(node)
      }

      if (!nodes.length) return loop(null)
      visit(db, next, onnode, loop)
    })
  }
}