diff --git a/util/nbs-file.js b/util/nbs-file.js
new file mode 100644
index 0000000..939a7df
--- /dev/null
+++ b/util/nbs-file.js
@@ -0,0 +1,157 @@
+function parse (buffer) {
+  let i = 0
+
+  let songLength = 0
+  let format = 0
+  let vanillaInstrumentCount = 0
+  songLength = readShort()
+  if (songLength === 0) {
+    format = readByte()
+  }
+
+  if (format >= 1) {
+    vanillaInstrumentCount = readByte()
+  }
+  if (format >= 3) {
+    songLength = readShort()
+  }
+
+  const layerCount = readShort()
+  const songName = readString()
+  const songAuthor = readString()
+  const songOriginalAuthor = readString()
+  const songDescription = readString()
+  const tempo = readShort()
+  const autoSaving = readByte()
+  const autoSavingDuration = readByte()
+  const timeSignature = readByte()
+  const minutesSpent = readInt()
+  const leftClicks = readInt()
+  const rightClicks = readInt()
+  const blocksAdded = readInt()
+  const blocksRemoved = readInt()
+  const origFileName = readString()
+
+  let loop = 0
+  let maxLoopCount = 0
+  let loopStartTick = 0
+  if (format >= 4) {
+    loop = readByte()
+    maxLoopCount = readByte()
+    loopStartTick = readShort()
+  }
+
+  const nbsNotes = []
+  let tick = -1
+  while (true) {
+    const tickJumps = readShort()
+    if (tickJumps === 0) break
+    tick += tickJumps
+
+    let layer = -1
+    while (true) {
+      const layerJumps = readShort()
+      if (layerJumps === 0) break
+      layer += layerJumps
+      const note = nbsNote()
+      note.tick = tick
+      note.layer = layer
+      note.instrument = readByte()
+      note.key = readByte()
+      if (format >= 4) {
+        note.velocity = readByte()
+        note.panning = readByte()
+        note.pitch = readShort()
+      }
+      nbsNotes.push(note)
+    }
+  }
+
+  const nbsLayers = []
+  if (i <= buffer.length) {
+    for (let j = 0; j < layerCount; j++) {
+      const layer = nbsLayer()
+      layer.name = readString()
+      if (format >= 4) {
+        layer.lock = readByte()
+      }
+      layer.volume = readByte()
+      if (format >= 2) {
+        layer.stereo = readByte()
+      }
+      nbsLayers.push(layer)
+    }
+  }
+
+  return {
+    songLength,
+    format,
+    vanillaInstrumentCount,
+    layerCount,
+    songName,
+    songAuthor,
+    songOriginalAuthor,
+    songDescription,
+    tempo,
+    autoSaving,
+    autoSavingDuration,
+    timeSignature,
+    minutesSpent,
+    leftClicks,
+    rightClicks,
+    blocksAdded,
+    blocksRemoved,
+    origFileName,
+    loop,
+    maxLoopCount,
+    loopStartTick,
+    nbsNotes,
+    nbsLayers
+  }
+
+  function readByte () {
+    return buffer.readInt8(i++)
+  }
+
+  function readShort () {
+    const short = buffer.readInt16LE(i)
+    i += 2
+    return short
+  }
+
+  function readInt () {
+    const int = buffer.readInt32LE(i)
+    i += 4
+    return int
+  }
+
+  function readString () {
+    let length = readInt()
+    let string = ''
+    for (; i > 0; i--) string += String.fromCharCode(readByte())
+    return string
+  }
+}
+
+function nbsNote () {
+  return {
+    tick: null,
+    layer: null,
+    instrument: null,
+    key: null,
+    velocity: 100,
+    panning: 100,
+    pitch: 0
+  }
+}
+
+function nbsLayer () {
+  return {
+    name: null,
+    lock: 0,
+    volume: null,
+    stereo: 100
+  }
+}
+
+module.exports = { parse, nbsNote, nbsLayer }
diff --git a/util/regexp.js b/util/regexp.js
new file mode 100644
index 0000000..f2d5bd5
--- /dev/null
+++ b/util/regexp.js
@@ -0,0 +1,7 @@
+// Useful RegExp s
+module.exports = {
+  ESCAPE_SEQUENCE: /\xa7.?/g,
+  VALID_ESCAPE_SEQUENCE: /\xa7[0-9a-fkl-orA-FKL-OR]/g,
+  INVALID_ESCAPE_SEQUENCE: /\xa7[^0-9a-fkl-orA-FKL-OR]/g,
+  UUID: /^[0-9a-fA-F]{8}\b\-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}$/
+}
diff --git a/util/stylize_with_color.js b/util/stylize_with_color.js
new file mode 100644
index 0000000..a192722
--- /dev/null
+++ b/util/stylize_with_color.js
@@ -0,0 +1,23 @@
+const styles = {
+  special: '\xa73',
+  number: '\xa76',
+  bigint: '\xa76',
+  boolean: '\xa76',
+  undefined: '\xa78',
+  null: '\xa7l',
+  string: '\xa72',
+  symbol: '\xa72',
+  date: '\xa75',
+  // "name": intentionally not styling
+  // TODO(BridgeAR): Highlight regular expressions properly.
+  regexp: '\xa74',
+  module: '\xa7n'
+}
+
+function stylizeWithColor (str, styleType) {
+  const style = styles[styleType]
+  if (style !== undefined) return `${style}${str}\xa7r`
+  return str
+}
+
+module.exports = { stylizeWithColor, styles }
diff --git a/util/uuid-to-nbt-uuid.js b/util/uuid-to-nbt-uuid.js
new file mode 100644
index 0000000..a3c0401
--- /dev/null
+++ b/util/uuid-to-nbt-uuid.js
@@ -0,0 +1,8 @@
+// originally from https://gist.github.com/storycraft/7813dd0186e85daa393e1df9cfa19f2a
+const nbt = require('prismarine-nbt')
+
+function toNBTUUID (uuid) {
+  return nbt.intArray(nbt.int(uuid.replace(/-/g, '').match(/.{8}/g).map(str => Number.parseInt(str, 16)).map(num => num & 0x80000000 ? num - 0xffffffff - 1 : num)))
+}
+
+module.exports = toNBTUUID