diff --git a/beautiful-racket/br/demo/jsonic.rkt b/beautiful-racket/br/demo/jsonic.rkt
index fd86369..1ec7d36 100644
--- a/beautiful-racket/br/demo/jsonic.rkt
+++ b/beautiful-racket/br/demo/jsonic.rkt
@@ -1,4 +1,4 @@
 #lang br/quicklang
 (module reader br/quicklang
-  (require "jsonic/reader.rkt")
-  (provide (all-from-out "jsonic/reader.rkt")))
+  (require (submod "jsonic/main.rkt" reader))
+  (provide (all-from-out (submod "jsonic/main.rkt" reader))))
diff --git a/beautiful-racket/br/demo/jsonic/expander.rkt b/beautiful-racket/br/demo/jsonic/expander.rkt
index 3312604..83cccf7 100644
--- a/beautiful-racket/br/demo/jsonic/expander.rkt
+++ b/beautiful-racket/br/demo/jsonic/expander.rkt
@@ -1,4 +1,5 @@
 #lang br/quicklang
+(require json (for-syntax br/datum racket/string))
 (provide (rename-out [jsonic-mb #%module-begin])
          jsonic-program
          char
@@ -6,13 +7,15 @@
  
 (define-macro (jsonic-mb PARSE-TREE)
   #'(#%module-begin
-     (display (string-trim PARSE-TREE))))
+     (define json-string (string-trim PARSE-TREE))
+     (when (string->jsexpr json-string)
+       (display json-string))))
 
 (define-macro (jsonic-program STR ...)
   #'(string-append STR ...))
 
-(define-macro (char TOK)
-  #'TOK)
+(define-macro (char STR)
+  #'STR)
 
 (define (stringify result)
   (cond
@@ -20,9 +23,10 @@
     [(string? result) (format "~v" result)]
     [(list? result) (format "[~a]" (string-join (map stringify result) ", "))]
     [(hash? result) (format "{~a}" (string-join (for/list ([(k v) (in-hash result)])
-                                                          (format "~a: ~a" (stringify k) (stringify v))) ", "))]
-    [else (error 'unknown-thing)]))
+                                                          (format "~a: ~a" (stringify k) (stringify v))) ", "))]))
 
-(define-macro (s-val TOK ...)
-  (with-pattern ([DATUM (read (open-input-string (apply string-append (map syntax->datum (syntax->list #'(TOK ...))))))])
+(define-macro (s-val STR ...)
+  (define s-exp-string
+    (string-join (map syntax->datum (syntax->list #'(STR ...))) ""))
+  (with-pattern ([DATUM (format-datum '~a s-exp-string)])
     #'(stringify DATUM)))
diff --git a/beautiful-racket/br/demo/jsonic/jsonic-test.rkt b/beautiful-racket/br/demo/jsonic/jsonic-test.rkt
index 78b5a7b..e67f6c5 100644
--- a/beautiful-racket/br/demo/jsonic/jsonic-test.rkt
+++ b/beautiful-racket/br/demo/jsonic/jsonic-test.rkt
@@ -1,8 +1,8 @@
 #lang br/demo/jsonic
-
-{"number": @$(* 6 7)$@,
-         "string": @$(string-append "foo" "bar")$@,
-         "array": @$(range 5)$@,
-         "object": @$(hash "k1" "valstring" "k2" 42)$@
-         //   "bar" :
-         }
\ No newline at end of file
+{
+   "number": @$(* 6 7)$@,
+   "string": @$(string-append "foo" "bar")$@,
+   "array": @$(range 5)$@,
+   "object": @$(hash "k1" "valstring" (format "~a" 42) (hash "k1" (range 10) "k2" 42))$@
+// "bar" :
+}
\ No newline at end of file
diff --git a/beautiful-racket/br/demo/jsonic/main.rkt b/beautiful-racket/br/demo/jsonic/main.rkt
new file mode 100644
index 0000000..e33b0f8
--- /dev/null
+++ b/beautiful-racket/br/demo/jsonic/main.rkt
@@ -0,0 +1,31 @@
+#lang at-exp br/quicklang
+(require "parser.rkt")
+
+(module+ reader
+  (define (read-syntax path port)
+    (define parse-tree (parse path (tokenize port)))
+    (define module-datum `(module bf-mod br/demo/jsonic/expander
+                            ,parse-tree))
+    (datum->syntax #f module-datum))
+  (provide read-syntax))
+
+(require parser-tools/lex parser-tools/lex-sre brag/support)
+(define (tokenize port)
+  (define (next-token)
+    (define our-lexer
+      (lexer
+       [(eof) eof]
+       ;; (char-complement "\n") means any char but "\n"
+       ;; (complement "\n") means any whole string except "\n"
+       [(seq "//" (* (char-complement "\n"))) (next-token)]
+       ["@$" (token 'OPEN lexeme)]
+       ["$@" (token 'CLOSE lexeme)]
+       [any-char (token 'CHAR lexeme)]))
+    (our-lexer port))  
+  next-token)
+
+(define (test-tokenize str)
+  (define ip (open-input-string str))
+  (define token-producer (tokenize ip))
+  (for/list ([token (in-producer token-producer eof)])
+            token))
diff --git a/beautiful-racket/br/demo/jsonic/parser.rkt b/beautiful-racket/br/demo/jsonic/parser.rkt
index 2cbe6c8..cd618d3 100644
--- a/beautiful-racket/br/demo/jsonic/parser.rkt
+++ b/beautiful-racket/br/demo/jsonic/parser.rkt
@@ -4,4 +4,4 @@ jsonic-program: (char | s-val)*
 
 char: CHAR
 
-s-val: /OPEN CHAR* /CLOSE  
\ No newline at end of file
+s-val: /OPEN CHAR* /CLOSE
\ No newline at end of file
diff --git a/beautiful-racket/br/demo/jsonic/reader.rkt b/beautiful-racket/br/demo/jsonic/reader.rkt
deleted file mode 100644
index da1f11b..0000000
--- a/beautiful-racket/br/demo/jsonic/reader.rkt
+++ /dev/null
@@ -1,28 +0,0 @@
-#lang at-exp br/quicklang
-(require "parser.rkt")
-
-(define (read-syntax path port)
-  (define parse-tree (parse path (tokenize port)))
-  (define module-datum `(module bf-mod br/demo/jsonic/expander
-                          ,parse-tree))
-  (datum->syntax #f module-datum))
-(provide read-syntax)
-
-(require parser-tools/lex parser-tools/lex-sre brag/support)
-(define (tokenize port)
-  (define (next-token)
-    (define our-lexer
-      (lexer
-       [(eof) eof]
-       [(or (seq "//" (complement (seq any-string "\n" any-string)) "\n")) (next-token)]
-       [(seq "@$") (token 'OPEN lexeme)]
-       [(seq "$@") (token 'CLOSE lexeme)]
-       [any-char (token 'CHAR lexeme)]))
-    (our-lexer port))  
-  next-token)
-
-(define (test-tokenize str)
-  (define ip (open-input-string str))
-  (define token-producer (tokenize ip))
-  (for/list ([token (in-producer token-producer eof)])
-            token))