diff --git a/package.json b/package.json
index 3cc7160..35cccd4 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "prepublish": "npm run compile"
   },
   "dependencies": {
+    "is-color": "^0.2.0",
     "is-there": "^4.0.0",
     "lodash": "^3.10.1",
     "node-sass": "^3.0.0"
diff --git a/src/index.js b/src/index.js
index 21d9173..569706c 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,9 +2,10 @@ import _          from 'lodash';
 import {resolve}  from 'path';
 import isThere    from 'is-there';
 import sass       from 'node-sass';
+import isColor    from 'is-color';
 
 export default function(url, prev) {
-  if (!/\.json$/.test(url)) {
+  if (!/\.(json|js)$/.test(url)) {
     return sass.NULL;
   }
 
@@ -26,11 +27,24 @@ export default function(url, prev) {
   // https://github.com/Updater/node-sass-json-importer/issues/21
   delete require.cache[require.resolve(file)];
 
+  var contents = require(file);
+  try {
+    if (/\.js$/.test(url)) {
+      contents = JSON.parse(JSON.stringify(contents));
+    }
+  } catch(e) {
+    return sass.NULL;
+  }
+
   return {
-    contents: parseJSON(require(file))
+    contents: parseJSON(contents)
   };
 }
 
+function isCSSUnit(value) {
+  return /^\d*\.*\d+(em|ex|ch|rem|vh|vw|vmin|vmax|px|mm|cm|in|pt|pc|deg|grad|rad|turn|s|ms|Hz|kHz|dpi|dpcm|dppx)$/.test(value);
+}
+
 function parseJSON(json) {
   return Object.keys(json)
     .map(key => `$${key}: ${parseValue(json[key])};`)
@@ -43,7 +57,7 @@ function parseValue(value) {
   } else if (_.isPlainObject(value)) {
     return parseMap(value);
   } else {
-    return value;
+    return parseEndValue(value);
   }
 }
 
@@ -58,3 +72,11 @@ function parseMap(map) {
     .map(key => `${key}: ${parseValue(map[key])}`)
     .join(',')})`;
 }
+
+function parseEndValue(value) {
+  if (typeof value === 'string' && !isColor(value) && !isCSSUnit(value)) {
+    return JSON.stringify(value);
+  }
+
+  return value;
+}
\ No newline at end of file
diff --git a/test/fixtures/convert-strings/style-js.scss b/test/fixtures/convert-strings/style-js.scss
new file mode 100644
index 0000000..eb6551c
--- /dev/null
+++ b/test/fixtures/convert-strings/style-js.scss
@@ -0,0 +1,9 @@
+@import 'variables.js';
+
+body {
+  content: $string;
+  color: $hex-color, $hsl-color, $rgba-color, $rgb-color, $css-color;
+  font-size: $em-unit;
+  margin-top: #{$number}px;
+  margin-bottom: #{$float}em;
+}
diff --git a/test/fixtures/convert-strings/style.scss b/test/fixtures/convert-strings/style.scss
new file mode 100644
index 0000000..6e90c0b
--- /dev/null
+++ b/test/fixtures/convert-strings/style.scss
@@ -0,0 +1,9 @@
+@import 'variables.json';
+
+body {
+  content: $string;
+  color: $hex-color, $hsl-color, $rgba-color, $rgb-color, $css-color;
+  font-size: $em-unit;
+  margin-top: #{$number}px;
+  margin-bottom: #{$float}em;
+}
diff --git a/test/fixtures/convert-strings/variables.js b/test/fixtures/convert-strings/variables.js
new file mode 100644
index 0000000..8eec4fa
--- /dev/null
+++ b/test/fixtures/convert-strings/variables.js
@@ -0,0 +1,12 @@
+module.exports = {
+  "hex-color": "#c33",
+  "hsl-color": "hsl(100, 100%, 100%)",
+  "rgba-color": "rgba(0, 0, 0, 1)",
+  "rgb-color": "rgb(10, 0, 0)",
+  "css-color": "blue",
+  "px-unit": "10px",
+  "em-unit": "2.3em",
+  "number": 5,
+  "float": 5.5,
+  "string": "Lorem ipsum, (\"foo\", bar)"
+}
diff --git a/test/fixtures/convert-strings/variables.json b/test/fixtures/convert-strings/variables.json
new file mode 100644
index 0000000..4ffdb19
--- /dev/null
+++ b/test/fixtures/convert-strings/variables.json
@@ -0,0 +1,12 @@
+{
+  "hex-color": "#c33",
+  "hsl-color": "hsl(100, 100%, 100%)",
+  "rgba-color": "rgba(0, 0, 0, 1)",
+  "rgb-color": "rgb(10, 0, 0)",
+  "css-color": "blue",
+  "px-unit": "10px",
+  "em-unit": "2.3em",
+  "number": 5,
+  "float": 5.5,
+  "string": "Lorem ipsum, (\"foo\", bar)"
+}
diff --git a/test/fixtures/include-paths/style-js.scss b/test/fixtures/include-paths/style-js.scss
new file mode 100644
index 0000000..50dbc94
--- /dev/null
+++ b/test/fixtures/include-paths/style-js.scss
@@ -0,0 +1,5 @@
+@import 'variables.js';
+
+body {
+  color: $color-red;
+}
diff --git a/test/fixtures/include-paths/variables/variables.js b/test/fixtures/include-paths/variables/variables.js
new file mode 100644
index 0000000..77876c4
--- /dev/null
+++ b/test/fixtures/include-paths/variables/variables.js
@@ -0,0 +1,4 @@
+module.exports = {
+  "color-red": "#c33",
+  "color-blue": "#33c"
+}
diff --git a/test/fixtures/lists/style-js.scss b/test/fixtures/lists/style-js.scss
new file mode 100644
index 0000000..9e752f3
--- /dev/null
+++ b/test/fixtures/lists/style-js.scss
@@ -0,0 +1,5 @@
+@import 'variables.js';
+
+body {
+  color: nth($colors, 1);
+}
diff --git a/test/fixtures/lists/variables.js b/test/fixtures/lists/variables.js
new file mode 100644
index 0000000..8371e6e
--- /dev/null
+++ b/test/fixtures/lists/variables.js
@@ -0,0 +1,3 @@
+module.exports = {
+  "colors": ["#c33", "#33c"]
+}
diff --git a/test/fixtures/maps/style-js.scss b/test/fixtures/maps/style-js.scss
new file mode 100644
index 0000000..36e4e70
--- /dev/null
+++ b/test/fixtures/maps/style-js.scss
@@ -0,0 +1,5 @@
+@import 'variables.js';
+
+body {
+  color: map-get($colors, red);
+}
diff --git a/test/fixtures/maps/variables.js b/test/fixtures/maps/variables.js
new file mode 100644
index 0000000..e3bb9e0
--- /dev/null
+++ b/test/fixtures/maps/variables.js
@@ -0,0 +1,5 @@
+module.exports = {
+  "colors": {
+    "red": "#c33"
+  }
+}
diff --git a/test/fixtures/strings/style-js.scss b/test/fixtures/strings/style-js.scss
new file mode 100644
index 0000000..50dbc94
--- /dev/null
+++ b/test/fixtures/strings/style-js.scss
@@ -0,0 +1,5 @@
+@import 'variables.js';
+
+body {
+  color: $color-red;
+}
diff --git a/test/fixtures/strings/variables.js b/test/fixtures/strings/variables.js
new file mode 100644
index 0000000..77876c4
--- /dev/null
+++ b/test/fixtures/strings/variables.js
@@ -0,0 +1,4 @@
+module.exports = {
+  "color-red": "#c33",
+  "color-blue": "#33c"
+}
diff --git a/test/fixtures/wrong-js-export/style-js.scss b/test/fixtures/wrong-js-export/style-js.scss
new file mode 100644
index 0000000..50dbc94
--- /dev/null
+++ b/test/fixtures/wrong-js-export/style-js.scss
@@ -0,0 +1,5 @@
+@import 'variables.js';
+
+body {
+  color: $color-red;
+}
diff --git a/test/fixtures/wrong-js-export/variables.js b/test/fixtures/wrong-js-export/variables.js
new file mode 100644
index 0000000..a90266f
--- /dev/null
+++ b/test/fixtures/wrong-js-export/variables.js
@@ -0,0 +1,4 @@
+module.exports = {
+  "color-red": function() {},
+  "color-blue": "#33c"
+}
diff --git a/test/index.js b/test/index.js
index fa3c13b..065ab55 100644
--- a/test/index.js
+++ b/test/index.js
@@ -6,68 +6,95 @@ import {resolve}    from 'path';
 
 const EXPECTATION = 'body {\n  color: #c33; }\n';
 
-describe('Import type test', function() {
-
-  it('imports strings', function() {
-    let result = sass.renderSync({
-      file: './test/fixtures/strings/style.scss',
-      importer: jsonImporter
+function sassRenderFile(opts = {}) {
+  return function(file) {
+    return sass.renderSync({
+      file: file,
+      importer: jsonImporter,
+      ...opts
     });
+  }
+}
 
+function testExpectedCSS(result) {
     expect(result.css.toString()).to.eql(EXPECTATION);
+}
+
+
+describe('Import type test', function() {
+
+  it('imports strings', function() {
+    ['./test/fixtures/strings/style.scss',
+      './test/fixtures/strings/style-js.scss'
+    ].map(sassRenderFile()).forEach(testExpectedCSS);
   });
 
   it('imports lists', function() {
-    let result = sass.renderSync({
-      file: './test/fixtures/lists/style.scss',
-      importer: jsonImporter
-    });
-
-    expect(result.css.toString()).to.eql(EXPECTATION);
+    ['./test/fixtures/lists/style.scss',
+      './test/fixtures/lists/style-js.scss'
+    ].map(sassRenderFile()).forEach(testExpectedCSS);
   });
 
   it('imports maps', function() {
-    let result = sass.renderSync({
-      file: './test/fixtures/maps/style.scss',
-      importer: jsonImporter
-    });
-
-    expect(result.css.toString()).to.eql(EXPECTATION);
+    ['./test/fixtures/maps/style.scss',
+      './test/fixtures/maps/style-js.scss'
+    ].map(sassRenderFile()).forEach(testExpectedCSS);
   });
 
   it('finds imports via includePaths', function() {
-    let result = sass.renderSync({
-      file: './test/fixtures/include-paths/style.scss',
-      includePaths: ['./test/fixtures/include-paths/variables'],
-      importer: jsonImporter
-    });
-
-    expect(result.css.toString()).to.eql(EXPECTATION);
+    ['./test/fixtures/include-paths/style.scss',
+      './test/fixtures/include-paths/style-js.scss'
+    ].map(sassRenderFile({
+      includePaths: ['./test/fixtures/include-paths/variables']
+    })).forEach(testExpectedCSS);
   });
 
   it('finds imports via multiple includePaths', function() {
-    let result = sass.renderSync({
-      file: './test/fixtures/include-paths/style.scss',
-      includePaths: ['./test/fixtures/include-paths/variables', './some/other/path/'],
-      importer: jsonImporter
-    });
+    ['./test/fixtures/include-paths/style.scss',
+      './test/fixtures/include-paths/style-js.scss'
+    ].map(sassRenderFile({
+      includePaths: ['./test/fixtures/include-paths/variables', './some/other/path/']
+    })).forEach(testExpectedCSS);
+  });
 
-    expect(result.css.toString()).to.eql(EXPECTATION);
+  it('quotes strings and preserves numbers, floats, colors, and values with units', function() {
+    ['./test/fixtures/convert-strings/style-js.scss',
+      './test/fixtures/convert-strings/style.scss'
+    ].map(sassRenderFile()).forEach(function(result) {
+      expect(result.css.toString()).to.eql(`body {\n  content: 'Lorem ipsum, ("foo", bar)';\n  color: #c33, white, black, #0a0000, blue;\n  font-size: 2.3em;\n  margin-top: 5px;\n  margin-bottom: 5.5em; }\n`);
+    });
   });
 
-  it(`throws when an import doesn't exist`, function() {
+  it(`strips non-valid JSON values from JS exports`, function() {
     function render() {
       sass.renderSync({
-        file: './test/fixtures/include-paths/style.scss',
-        includePaths: ['./test/fixtures/include-paths/foo'],
+        file: './test/fixtures/wrong-js-export/style-js.scss',
         importer: jsonImporter
       });
     }
+    expect(render).to.throw(`Undefined variable: "$color-red".`)
+  });
+
+  it(`throws when an import doesn't exist`, function() {
+    function render(file) {
+      return function() {
+        sass.renderSync({
+          file: file,
+          includePaths: ['./test/fixtures/include-paths/foo'],
+          importer: jsonImporter
+        });
+      }
+    }
 
-    expect(render).to.throw(
+    expect(render('./test/fixtures/include-paths/style.scss')).to.throw(
       'Unable to find "variables.json" from the following path(s): ' +
       `${resolve(process.cwd(), 'test/fixtures/include-paths')}, ./test/fixtures/include-paths/foo. ` +
       'Check includePaths.'
     );
+    expect(render('./test/fixtures/include-paths/style-js.scss')).to.throw(
+      'Unable to find "variables.js" from the following path(s): ' +
+      `${resolve(process.cwd(), 'test/fixtures/include-paths')}, ./test/fixtures/include-paths/foo. ` +
+      'Check includePaths.'
+    );
   });
 });