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diff --git a/blockly/i18n/js_to_json.py b/blockly/i18n/js_to_json.py
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+++ b/blockly/i18n/js_to_json.py
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+#!/usr/bin/python
+
+# Gives the translation status of the specified apps and languages.
+#
+# Copyright 2013 Google Inc.
+# https://developers.google.com/blockly/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Extracts messages from .js files into .json files for translation.
+
+Specifically, lines with the following formats are extracted:
+
+    /// Here is a description of the following message.
+    Blockly.SOME_KEY = 'Some value';
+
+Adjacent "///" lines are concatenated.
+
+There are two output files, each of which is proper JSON.  For each key, the
+file en.json would get an entry of the form:
+
+    "Blockly.SOME_KEY", "Some value",
+
+The file qqq.json would get:
+
+    "Blockly.SOME_KEY", "Here is a description of the following message.",
+
+Commas would of course be omitted for the final entry of each value.
+
+@author Ellen Spertus (ellen.spertus@gmail.com)
+"""
+
+import argparse
+import codecs
+import json
+import os
+import re
+from common import write_files
+
+
+_INPUT_DEF_PATTERN = re.compile("""Blockly.Msg.(\w*)\s*=\s*'([^']*)';?$""")
+
+_INPUT_SYN_PATTERN = re.compile(
+    """Blockly.Msg.(\w*)\s*=\s*Blockly.Msg.(\w*);""")
+
+def main():
+  # Set up argument parser.
+  parser = argparse.ArgumentParser(description='Create translation files.')
+  parser.add_argument(
+      '--author',
+      default='Ellen Spertus <ellen.spertus@gmail.com>',
+      help='name and email address of contact for translators')
+  parser.add_argument('--lang', default='en',
+                      help='ISO 639-1 source language code')
+  parser.add_argument('--output_dir', default='json',
+                      help='relative directory for output files')
+  parser.add_argument('--input_file', default='messages.js',
+                      help='input file')
+  parser.add_argument('--quiet', action='store_true', default=False,
+                      help='only display warnings, not routine info')
+  args = parser.parse_args()
+  if (not args.output_dir.endswith(os.path.sep)):
+    args.output_dir += os.path.sep
+
+  # Read and parse input file.
+  results = []
+  synonyms = {}
+  description = ''
+  infile = codecs.open(args.input_file, 'r', 'utf-8')
+  for line in infile:
+    if line.startswith('///'):
+      if description:
+        description = description + ' ' + line[3:].strip()
+      else:
+        description = line[3:].strip()
+    else:
+      match = _INPUT_DEF_PATTERN.match(line)
+      if match:
+        result = {}
+        result['meaning'] = match.group(1)
+        result['source'] = match.group(2)
+        if not description:
+          print('Warning: No description for ' + result['meaning'])
+        result['description'] = description
+        description = ''
+        results.append(result)
+      else:
+        match = _INPUT_SYN_PATTERN.match(line)
+        if match:
+          if description:
+            print('Warning: Description preceding definition of synonym {0}.'.
+                  format(match.group(1)))
+            description = ''
+          synonyms[match.group(1)] = match.group(2)
+  infile.close()
+
+  # Create <lang_file>.json, keys.json, and qqq.json.
+  write_files(args.author, args.lang, args.output_dir, results, False)
+
+  # Create synonyms.json.
+  synonym_file_name = os.path.join(os.curdir, args.output_dir, 'synonyms.json')
+  with open(synonym_file_name, 'w') as outfile:
+    json.dump(synonyms, outfile)
+  if not args.quiet:
+    print("Wrote {0} synonym pairs to {1}.".format(
+        len(synonyms), synonym_file_name))
+
+
+if __name__ == '__main__':
+  main()