diff --git a/basis/json/reader/reader-tests.factor b/basis/json/reader/reader-tests.factor
index 430be777bcb..dcd45f18766 100644
--- a/basis/json/reader/reader-tests.factor
+++ b/basis/json/reader/reader-tests.factor
@@ -64,3 +64,10 @@ IN: json.reader.tests
 
 ! empty objects are allowed as values in objects
 { H{ { "foo" H{ } } } } [ "{ \"foo\" : {}}" json> ] unit-test
+
+{
+    "\0\x01\x02\x03\x04\x05\x06\a\b\t\n\v\f\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\e\x1c\x1d\x1e\x1f"
+} [
+    "\"\\u0000\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\\b\\t\\n\\u000b\\f\\r\\u000e\\u000f\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017\\u0018\\u0019\\u001a\\u001b\\u001c\\u001d\\u001e\\u001f\""
+    json>
+] unit-test
diff --git a/basis/json/reader/reader.factor b/basis/json/reader/reader.factor
index 4990bc16abc..84e1359a79c 100644
--- a/basis/json/reader/reader.factor
+++ b/basis/json/reader/reader.factor
@@ -11,15 +11,18 @@ IN: json.reader
 <PRIVATE
 
 : value ( char stream -- num char )
-    [ 1string ] [ " \t\r\n,:}]" swap stream-read-until ] bi*
+    [ 1string ] [ "\s\t\r\n,:}]" swap stream-read-until ] bi*
     [ append string>number ] dip ;
 
 DEFER: j-string%
 
 : j-escape% ( stream -- )
     dup stream-read1 {
-        { CHAR: b [ 8 ] }
-        { CHAR: f [ 12 ] }
+        { CHAR: " [ CHAR: " ] }
+        { CHAR: \\ [ CHAR: \\ ] }
+        { CHAR: / [ CHAR: / ] }
+        { CHAR: b [ CHAR: \b ] }
+        { CHAR: f [ CHAR: \f ] }
         { CHAR: n [ CHAR: \n ] }
         { CHAR: r [ CHAR: \r ] }
         { CHAR: t [ CHAR: \t ] }
diff --git a/basis/json/writer/writer-tests.factor b/basis/json/writer/writer-tests.factor
index 0ddf77474a9..6a3c2a6dfeb 100644
--- a/basis/json/writer/writer-tests.factor
+++ b/basis/json/writer/writer-tests.factor
@@ -11,7 +11,7 @@ IN: json.writer.tests
 { "102.5" } [ 102.5 >json ] unit-test
 
 { "[1,\"two\",3.0]" } [ { 1 "two" 3.0 } >json ] unit-test
-{ """{"US$":1.0,"EU€":1.5}""" } [ H{ { "US$" 1.0 } { "EU€" 1.5 } } >json ] unit-test
+{ """{"US$":1.0,"EU\\u20ac\":1.5}""" } [ H{ { "US$" 1.0 } { "EU€" 1.5 } } >json ] unit-test
 
 ! Random symbols are written simply as strings
 SYMBOL: testSymbol
@@ -61,3 +61,10 @@ TUPLE: person name age a-a ;
 
 { """{"NaN":1}""" }
 [ H{ { NAN: 333 1 } } >json ] unit-test
+
+{
+    "\"\\u0000\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\\b\\t\\n\\u000b\\f\\r\\u000e\\u000f\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017\\u0018\\u0019\\u001a\\u001b\\u001c\\u001d\\u001e\\u001f\""
+} [
+    "\0\x01\x02\x03\x04\x05\x06\a\b\t\n\v\f\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\e\x1c\x1d\x1e\x1f"
+    >json
+] unit-test
diff --git a/basis/json/writer/writer.factor b/basis/json/writer/writer.factor
index 7218cca1b80..10ba9f3c653 100644
--- a/basis/json/writer/writer.factor
+++ b/basis/json/writer/writer.factor
@@ -1,8 +1,8 @@
 ! Copyright (C) 2006 Chris Double.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors kernel io.streams.string io strings splitting
-sequences math math.parser assocs classes words namespaces make
-prettyprint hashtables mirrors tr json fry combinators ;
+USING: accessors ascii assocs combinators fry hashtables io
+io.streams.string json kernel math math.parser mirrors
+namespaces sequences strings tr words ;
 IN: json.writer
 
 #! Writes the object out to a stream in JSON format
@@ -28,9 +28,23 @@ M: string stream-json-print
     CHAR: " over stream-write1 swap [
         {
             { CHAR: "  [ "\\\"" over stream-write ] }
-            { CHAR: \r [ ] }
-            { CHAR: \n [ "\\r\\n" over stream-write ] }
-            [ over stream-write1 ]
+            { CHAR: \\  [ "\\\\" over stream-write ] }
+            { CHAR: /  [ "\\/" over stream-write ] }
+            { CHAR: \b [ "\\b" over stream-write ] }
+            { CHAR: \f [ "\\f" over stream-write ] }
+            { CHAR: \n [ "\\n" over stream-write ] }
+            { CHAR: \r [ "\\r" over stream-write ] }
+            { CHAR: \s [ "\\s" over stream-write ] }
+            { CHAR: \t [ "\\t" over stream-write ] }
+            [
+                dup printable?
+                [ over stream-write1 ]
+                [
+                    "\\u" pick stream-write
+                    >hex 4 CHAR: 0 pad-head
+                    over stream-write
+                ] if
+            ]
         } case
     ] each CHAR: " swap stream-write1 ;
 
@@ -46,7 +60,7 @@ M: integer stream-json-print
     } cond ;
 
 M: float stream-json-print
-    [ float>json ] dip stream-write ;
+    [ float>json ] [ stream-write ] bi* ;
 
 M: real stream-json-print
     [ >float number>string ] [ stream-write ] bi* ;