Added a number of tests from JSON_checker's test suite here: http://json.org/JSON_checker/

test/fails/1.json

@@ -0,0 +1 @@
+"A JSON payload should be an object or array, not a string."

test/fails/10.json

@@ -0,0 +1 @@
+{"Extra value after close": true} "misplaced quoted value"

test/fails/11.json

@@ -0,0 +1 @@
+{"Illegal expression": 1 + 2}

test/fails/12.json

@@ -0,0 +1 @@
+{"Illegal invocation": alert()}

test/fails/13.json

@@ -0,0 +1 @@
+{"Numbers cannot have leading zeroes": 013}

test/fails/14.json

@@ -0,0 +1 @@
+{"Numbers cannot be hex": 0x14}

test/fails/15.json

@@ -0,0 +1 @@
+["Illegal backslash escape: \x15"]

test/fails/16.json

@@ -0,0 +1 @@
+[\naked]

test/fails/17.json

@@ -0,0 +1 @@
+["Illegal backslash escape: \017"]

test/fails/18.json

@@ -0,0 +1 @@
+[[[[[[[[[[[[[[[[[[[["Too deep"]]]]]]]]]]]]]]]]]]]]

test/fails/19.json

@@ -0,0 +1 @@
+{"Missing colon" null}

test/fails/2.json

@@ -0,0 +1 @@
+["Unclosed array"

test/fails/20.json

@@ -0,0 +1 @@
+{"Double colon":: null}

test/fails/21.json

@@ -0,0 +1 @@
+{"Comma instead of colon", null}

test/fails/22.json

@@ -0,0 +1 @@
+["Colon instead of comma": false]

test/fails/23.json

@@ -0,0 +1 @@
+["Bad value", truth]

test/fails/24.json

@@ -0,0 +1 @@
+['single quote']

test/fails/25.json

@@ -0,0 +1 @@
+["	tab	character	in	string	"]

test/fails/26.json

@@ -0,0 +1 @@
+["tab\   character\   in\  string\  "]

test/fails/27.json

@@ -0,0 +1,2 @@
+["line
+break"]

test/fails/28.json

@@ -0,0 +1,2 @@
+["line\
+break"]

test/fails/29.json

@@ -0,0 +1 @@
+[0e]

test/fails/3.json

@@ -0,0 +1 @@
+{unquoted_key: "keys must be quoted"}

test/fails/30.json

@@ -0,0 +1 @@
+[0e+]

test/fails/31.json

@@ -0,0 +1 @@
+[0e+-1]

test/fails/32.json

@@ -0,0 +1 @@
+{"Comma instead if closing brace": true,

test/fails/33.json

@@ -0,0 +1 @@
+["mismatch"}

test/fails/4.json

@@ -0,0 +1 @@
+["extra comma",]

test/fails/5.json

@@ -0,0 +1 @@
+["double extra comma",,]

test/fails/6.json

@@ -0,0 +1 @@
+[   , "<-- missing value"]

test/fails/7.json

@@ -0,0 +1 @@
+["Comma after the close"],

test/fails/8.json

@@ -0,0 +1 @@
+["Extra close"]]

test/fails/9.json

@@ -0,0 +1 @@
+{"Extra comma": true,}

test/passes/1.json

@@ -0,0 +1,58 @@
+[
+    "JSON Test Pattern pass1",
+    {"object with 1 member":["array with 1 element"]},
+    {},
+    [],
+    -42,
+    true,
+    false,
+    null,
+    {
+        "integer": 1234567890,
+        "real": -9876.543210,
+        "e": 0.123456789e-12,
+        "E": 1.234567890E+34,
+        "":  23456789012E66,
+        "zero": 0,
+        "one": 1,
+        "space": " ",
+        "quote": "\"",
+        "backslash": "\\",
+        "controls": "\b\f\n\r\t",
+        "slash": "/ & \/",
+        "alpha": "abcdefghijklmnopqrstuvwyz",
+        "ALPHA": "ABCDEFGHIJKLMNOPQRSTUVWYZ",
+        "digit": "0123456789",
+        "0123456789": "digit",
+        "special": "`1~!@#$%^&*()_+-={':[,]}|;.</>?",
+        "hex": "\u0123\u4567\u89AB\uCDEF\uabcd\uef4A",
+        "true": true,
+        "false": false,
+        "null": null,
+        "array":[  ],
+        "object":{  },
+        "address": "50 St. James Street",
+        "url": "http://www.JSON.org/",
+        "comment": "// /* <!-- --",
+        "# -- --> */": " ",
+        " s p a c e d " :[1,2 , 3
+
+,
+
+4 , 5        ,          6           ,7        ],"compact":[1,2,3,4,5,6,7],
+        "jsontext": "{\"object with 1 member\":[\"array with 1 element\"]}",
+        "quotes": "&#34; \u0022 %22 0x22 034 &#x22;",
+        "\/\\\"\uCAFE\uBABE\uAB98\uFCDE\ubcda\uef4A\b\f\n\r\t`1~!@#$%^&*()_+-=[]{}|;:',./<>?"
+: "A key can be any string"
+    },
+    0.5 ,98.6
+,
+99.44
+,
+
+1066,
+1e1,
+0.1e1,
+1e-1,
+1e00,2e+00,2e-00
+,"rosebud"]

test/passes/2.json

@@ -0,0 +1 @@
+[[[[[[[[[[[[[[[[[[["Not too deep"]]]]]]]]]]]]]]]]]]]

test/passes/3.json

@@ -0,0 +1,6 @@
+{
+    "JSON Test Pattern pass3": {
+        "The outermost value": "must be an object or array.",
+        "In this test": "It is an object."
+    }
+}