diff --git a/meta.js b/meta.js
new file mode 100644
index 0000000..7c47536
--- /dev/null
+++ b/meta.js
@@ -0,0 +1,67 @@
+// This is a copy of https://github.com/pd4d10/userscript-meta/blob/master/index.js
+'use strict'
+
+function isUndefined(val) {
+  return typeof val === 'undefined'
+}
+
+function isObject(val) {
+  return typeof val === 'object' && val !== null
+}
+
+// Parse metadata to an object
+function parse(meta) {
+  if (typeof meta !== 'string') {
+    throw new Error('`Parse`\'s first argument should be a string')
+  }
+
+  return meta.split(/[\r\n]/)
+    .filter(function (line) { // remove blank line
+      return /\S+/.test(line) &&
+        line.indexOf('==UserScript==') === -1 &&
+        line.indexOf('==/UserScript==') === -1
+    })
+    .reduce(function (obj, line) {
+      var arr = line.trim().replace(/^\/\//, '').trim().split(/\s+/)
+      var key = arr[0].slice(1)
+      var value = arr.slice(1).join(' ')
+
+      if (isUndefined(obj[key])) {
+        obj[key] = value
+      } else if (Array.isArray(obj[key])) {
+        obj[key].push(value)
+      } else {
+        obj[key] = [obj[key], value]
+      }
+
+      return obj
+    }, {})
+}
+
+function getLine(key, value) {
+  // For field which has multiple values, like `match`
+  if (Array.isArray(value)) {
+    return value.map(function (value) {
+      return getLine(key, value)
+    }).join('')
+  }
+
+  return '// @' + key + ' ' + value + '\n'
+}
+
+// Stringify metadata from an object
+function stringify(obj) {
+  if (!isObject(obj)) {
+    throw new Error('`Stringify`\'s first argument should be an object')
+  }
+
+  var meta = Object.keys(obj)
+    .map(function (key) {
+      return getLine(key, obj[key])
+    }).join('')
+
+  return '// ==UserScript==\n' + meta + '// ==/UserScript==\n'
+}
+
+exports.parse = parse
+exports.stringify = stringify
\ No newline at end of file