diff --git a/Gruntfile.js b/Gruntfile.js
index ed5a3d2..3c41546 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -18,13 +18,25 @@ module.exports = function(grunt) {
             src: "src/**/*.purs",
             dest: "README.md"
         }
+    },
+    jsvalidate: {
+      options:{
+        globals: {},
+        esprimaOptions: {},
+        verbose: false
+      },
+      targetName:{
+        files:{
+          src: ['output/Data.String/*.js']
+        }
+      }
     }
-
   });
 
+  grunt.loadNpmTasks('grunt-jsvalidate');
   grunt.loadNpmTasks("grunt-contrib-clean");
   grunt.loadNpmTasks("grunt-purescript");
   
-  grunt.registerTask("make", ["pscMake", "dotPsci", "docgen"]);
+  grunt.registerTask("make", ["pscMake", "dotPsci", "docgen", "jsvalidate"]);
   grunt.registerTask("default", ["make"]);
 };
diff --git a/package.json b/package.json
index fa4a87c..c2867b1 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
   "private": true,
   "dependencies": {
-    "grunt": "~0.4.4",
-    "grunt-purescript": "~0.5.1",
-    "grunt-contrib-clean": "~0.5.0"
+    "grunt":                "~0.4.4",
+    "grunt-purescript":     "~0.5.1",
+    "grunt-contrib-clean":  "~0.5.0",
+    "grunt-jsvalidate":     "~0.2.2"
   }
 }
diff --git a/src/Data/String.purs b/src/Data/String.purs
index cce7714..595cfcd 100644
--- a/src/Data/String.purs
+++ b/src/Data/String.purs
@@ -47,7 +47,7 @@ module Data.String
   foreign import fromCharArray
     "function fromCharArray(a) {\
     \   return a.join('');  \
-    \" :: [Char] -> String
+    \}" :: [Char] -> String
 
   foreign import indexOf
     "function indexOf(x) {\