diff --git a/.gitignore b/.gitignore
index 91b829c..bc21573 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .idea
 node_modules
 .DS_STORE
+.vscode
 
 # ignore generated grammars
 formatted-data
diff --git a/package.json b/package.json
index 72554b5..6bf5523 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "scripts": {
     "prepublish": "npm start",
     "test": "./node_modules/.bin/mocha --reporter spec --recursive",
-    "start": "mkdir -p formatted-data src/grammars/generated/json && node ./node_modules/nearley/bin/nearleyc.js ./src/grammars/nearley/formalSyntax.ne > ./src/grammars/js/formalSyntax.js && node ./src/scripts/updateBasicDataUnits.js && node ./src/scripts/formatData.js && node ./src/scripts/formatFormalSyntaxes.js && node ./src/scripts/formatGrammars.js",
+    "start": "./updateCSSData.sh",
     "clean": "rm -rf src/grammars/generated",
     "benchmark": "node test/benchmark.js",
     "doctoc": "node ./node_modules/doctoc/doctoc.js README.md",
@@ -42,11 +42,11 @@
     "mocha": "^3.5.0",
     "pre-commit": "^1.2.2",
     "postcss-value-parser": "^3.3.0",
-    "sinon": "^2.4.1"
+    "sinon": "^2.4.1",
+    "mdn-data": "1.0.0"
   },
   "dependencies": {
     "fs-extra": "^3.0.1",
-    "mdn-data": "1.0.0",
     "moo": "^0.4.1",
     "nearley": "^2.11.0"
   }
diff --git a/src/expandShorthandProperty.js b/src/expandShorthandProperty.js
index f292efa..83fcc3d 100644
--- a/src/expandShorthandProperty.js
+++ b/src/expandShorthandProperty.js
@@ -1,5 +1,5 @@
 const nearley = require('nearley');
-const { css: { properties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 const isShorthandProperty = require('./isShorthandProperty');
 const getShorthandComputedProperties = require('./getShorthandComputedProperties');
 const shorthandProperties = require('../formatted-data/shorthand-properties.json');
diff --git a/src/getShorthandComputedProperties.js b/src/getShorthandComputedProperties.js
index d2571eb..3164609 100644
--- a/src/getShorthandComputedProperties.js
+++ b/src/getShorthandComputedProperties.js
@@ -1,4 +1,4 @@
-const { css: { properties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 
 /**
  * Given a shorthand property, returns an array of the computed properties for that shorthand property. If given
diff --git a/src/getShorthandsForProperty.js b/src/getShorthandsForProperty.js
index 55024ad..50ebbb4 100644
--- a/src/getShorthandsForProperty.js
+++ b/src/getShorthandsForProperty.js
@@ -1,5 +1,5 @@
 const shortHandProperties = require('../formatted-data/shorthand-properties.json');
-const { css: { properties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 
 /**
  * @type {Object}
diff --git a/src/initialValueMap.js b/src/initialValueMap.js
index 0e1730c..c661f48 100644
--- a/src/initialValueMap.js
+++ b/src/initialValueMap.js
@@ -1,4 +1,4 @@
-const { css: { properties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 const getShorthandComputedProperties = require('./getShorthandComputedProperties');
 const isShorthandProperty = require('./isShorthandProperty');
 
diff --git a/src/isValidDeclaration.js b/src/isValidDeclaration.js
index b5d554a..c9ac2b9 100644
--- a/src/isValidDeclaration.js
+++ b/src/isValidDeclaration.js
@@ -1,5 +1,5 @@
 const nearley = require('nearley');
-const { css: { properties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 const { CSS } = require('./constants');
 
 /**
diff --git a/src/scripts/extractProperties.js b/src/scripts/extractProperties.js
new file mode 100644
index 0000000..79fb0f2
--- /dev/null
+++ b/src/scripts/extractProperties.js
@@ -0,0 +1,14 @@
+/**
+ * Takes raw data from MDN, filters out the shorthand properties, and decorates the data with additional properties.
+ * Writes the formatted data to FORMATTED_DATA_PATH.
+ */
+const fs = require('fs-extra');
+const { css: { properties } } = require('mdn-data');
+const PATHS = require('../constants/paths');
+
+const ALL_PROPERTIES_DATA_FILE_NAME = 'properties.json';
+const OUTPUT_FILE = `${PATHS.FORMATTED_DATA_PATH}${ALL_PROPERTIES_DATA_FILE_NAME}`;
+fs.writeJson(OUTPUT_FILE, properties, { spaces: 2 })
+  .then(() => (
+    console.log(`Successfully extracted properties to ${OUTPUT_FILE}`)
+  ));
diff --git a/test/InitialValuesTest.js b/test/InitialValuesTest.js
index 1647144..cca2d02 100644
--- a/test/InitialValuesTest.js
+++ b/test/InitialValuesTest.js
@@ -1,5 +1,5 @@
 const { assert } = require('chai');
-const { css: { properties: cssProperties } } = require('mdn-data');
+const properties = require('../formatted-data/properties.json');
 const {
    initialValue,
    initialValues,
@@ -31,7 +31,7 @@ describe('Initial values', function () {
       'position',
       'transform-box',
     ]);
-    Object.keys(cssProperties).forEach((prop) => {
+    Object.keys(properties).forEach((prop) => {
       if (prop.startsWith('-') || buggyValues.has(prop)) return; // bug in grammar data
       let initial = initialValue(prop);
       assert(isValidDeclaration(prop, initial), `${prop}: ${initial} is not a legal initial value`);
diff --git a/updateCSSData.sh b/updateCSSData.sh
new file mode 100755
index 0000000..56867f1
--- /dev/null
+++ b/updateCSSData.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+function realpath()
+{
+    f=$@
+    if [ -d "$f" ]; then
+        base=""
+        dir="$f"
+    else
+        base="/$(basename "$f")"
+        dir=$(dirname "$f")
+    fi
+    dir=$(cd "$dir" && /bin/pwd)
+    echo "$dir$base"
+}
+cd "$(dirname "$(realpath "$0")")";
+rm -rf formatted-data src/grammars/generated/json
+mkdir -p formatted-data src/grammars/generated/json
+node ./node_modules/nearley/bin/nearleyc.js ./src/grammars/nearley/formalSyntax.ne > ./src/grammars/js/formalSyntax.js || exit 1
+node ./src/scripts/updateBasicDataUnits.js || exit 1
+node ./src/scripts/formatData.js || exit 1
+node ./src/scripts/formatFormalSyntaxes.js || exit 1
+node ./src/scripts/formatGrammars.js || exit 1
+node ./src/scripts/extractProperties.js || exit 1
\ No newline at end of file