1 files changed, 11 insertions, 2 deletions
diff --git a/lib/json/encodeBook.js b/lib/json/encodeBook.js
index ba19999..c134312 100644
--- a/lib/json/encodeBook.js
+++ b/lib/json/encodeBook.js
@@ -1,5 +1,6 @@
-var gitbook = require('../gitbook');
+var extend = require('extend');
 
+var gitbook = require('../gitbook');
 var encodeSummary = require('./encodeSummary');
 var encodeGlossary = require('./encodeGlossary');
 var encodeReadme = require('./encodeReadme');
@@ -11,6 +12,11 @@ var encodeReadme = require('./encodeReadme');
     @return {Object}
 */
 function encodeBookToJson(book) {
+    var config = book.getConfig();
+    var language = book.getLanguage();
+
+    var variables = config.getValue('variables', {});
+
     return {
         summary: encodeSummary(book.getSummary()),
         glossary: encodeGlossary(book.getGlossary()),
@@ -19,7 +25,10 @@ function encodeBookToJson(book) {
         gitbook: {
             version: gitbook.version,
             time: gitbook.START_TIME
-        }
+        },
+        book: extend({
+            language: language? language : undefined
+        }, variables)
     };
 }