document 'json' option

readme.txt

@@ -21,27 +21,38 @@ It provides .set and .get methods that are also continuations,
     Store('users.db', function (err, db) {
         db.set('pkrumins', 'cool dude', function (error) {
             // value 'pkrumins' is now set to 'cool dude'
-            db.get('pkrumins', function (error, value) {
+            db.get('pkrumins', function (error, value, key) {
                 console.log(value); // cool dude
             });
         });
     });
 
+If you wish to store JSON objects in the database, you may pass a dict with the
+key 'json' set to true and the key 'filename' for file as the first argument to
+Store,
+
+    Store({ filename : 'objects.db', json : true },
+        function (error, db) {
+            // now any .set and .get operations will call JSON.stringify
+            // and JSON.parse on values.
+    	}
+    );
+
 It also has .filter function that takes a predicate, callback and done function.
 The .filter function calls callback on each row for which predicate is true.
 After it's done filtering, it calls done function.
 
 Here is an example:
 
-    Store('users.db', function (err, db) {
+    Store({ filename : 'users.db', json : true }, function (err, db) {
         var users = [];
         db.filter(
             function (user, userInfo) { //1//
-                return JSON.parse(userInfo).age < 20
+                return userInfo.age < 20
             },
             function (err, user, userInfo) { //2//
                 if (err) throw err;
-                users.push(JSON.parse(userInfo));
+                users.push(userInfo);
             },
             function () { //3//
                 console.log("Users younger than 20:");
@@ -52,8 +63,6 @@ Here is an example:
         );
     });
 
-In this example it's assumed that users are stored in the database as JSON objects.
-The keys are usernames and values are JSON objects.
 The filter function here takes the predicate function //1//, parses each record and
 returns true if user's age is less than 20.
 Now if the age is less than 20, filter calls callback function //2//, which adds each
@@ -63,11 +72,11 @@ prints out all usernames of youngters.
 
 Store also has .forEach method that iterates over all of its values,
 
-    Store('users.db', function (db) {
+    Store({ filename: 'users.db', json : true }, function (db) {
         db.forEach(
             function (err, key, val) {
                 if (err) throw err;
-                console.log("User " + key + " is " + JSON.parse(val).age + " old.");
+                console.log("User " + key + " is " + val.age + " old.");
             },
             function () {
                 console.log("Done with all users.");