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diff --git a/src/testdir/test_json.vim b/src/testdir/test_json.vim
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+" Test for JSON functions.
+
+let s:json1 = '"str\"in\\g"'
+let s:var1 = "str\"in\\g"
+let s:json2 = '"\u0001\u0002\u0003\u0004\u0005\u0006\u0007"'
+let s:var2 = "\x01\x02\x03\x04\x05\x06\x07"
+let s:json3 = '"\b\t\n\u000b\f\r\u000e\u000f"'
+let s:var3 = "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
+let s:json4 = '"\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017"'
+let s:var4 = "\x10\x11\x12\x13\x14\x15\x16\x17"
+let s:json5 = '"\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f"'
+let s:var5 = "\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
+
+" surrogate pair
+let s:jsonsp1 = '"\ud83c\udf63"'
+let s:varsp1 = "\xf0\x9f\x8d\xa3"
+let s:jsonsp2 = '"\ud83c\u00a0"'
+let s:varsp2 = "\ud83c\u00a0"
+
+let s:jsonmb = '"s¢cĴgё"'
+let s:varmb = "s¢cĴgё"
+let s:jsonnr = '1234'
+let s:varnr = 1234
+if has('float')
+  let s:jsonfl = '12.34'
+  let s:varfl = 12.34
+  let s:jsonneginf = '-Infinity'
+  let s:jsonposinf = 'Infinity'
+  let s:varneginf = -1.0 / 0.0
+  let s:varposinf = 1.0 / 0.0
+  let s:jsonnan = 'NaN'
+  let s:varnan = 0.0 / 0.0
+endif
+
+let s:jsonl1 = '[1,"a",3]'
+let s:varl1 = [1, "a", 3]
+let s:jsonl2 = '[1,["a",[],"c"],3]'
+let s:jsonl2s = "  [\r1  ,  [  \"a\"  ,  [  ]  ,  \"c\"  ]  ,  3\<Tab>]\r\n"
+let s:varl2 = [1, 2, 3]
+let l2 = ['a', s:varl2, 'c']
+let s:varl2[1] = l2
+let s:varl2x = [1, ["a", [], "c"], 3]
+let s:jsonl3 = '[[1,2],[1,2]]'
+let l3 = [1, 2]
+let s:varl3 = [l3, l3]
+
+let s:jsond1 = '{"a":1,"b":"bee","c":[1,2]}'
+let s:jsd1 = '{a:1,b:"bee",c:[1,2]}'
+let s:vard1 = {"a": 1, "b": "bee","c": [1,2]}
+let s:jsond2 = '{"1":1,"2":{"a":"aa","b":{},"c":"cc"},"3":3}'
+let s:jsd2 = '{"1":1,"2":{a:"aa",b:{},c:"cc"},"3":3}'
+let s:jsond2s = "  { \"1\" : 1 , \"2\" :\n{ \"a\"\r: \"aa\" , \"b\" : {\<Tab>} , \"c\" : \"cc\" } , \"3\" : 3 }\r\n"
+let s:jsd2s = "  { \"1\" : 1 , \"2\" :\n{ a\r: \"aa\" , b : {\<Tab>} , c : \"cc\" } , \"3\" : 3 }\r\n"
+let s:vard2 = {"1": 1, "2": 2, "3": 3}
+let d2 = {"a": "aa", "b": s:vard2, "c": "cc"}
+let s:vard2["2"] = d2
+let s:vard2x = {"1": 1, "2": {"a": "aa", "b": {}, "c": "cc"}, "3": 3}
+let d3 = {"a": 1, "b": 2}
+let s:vard3 = {"x": d3, "y": d3}
+let s:jsond3 = '{"x":{"a":1,"b":2},"y":{"a":1,"b":2}}'
+let s:jsd3 = '{x:{a:1,b:2},y:{a:1,b:2}}'
+let s:vard4 = {"key": v:none}
+let s:vard4x = {"key": v:null}
+let s:jsond4 = '{"key":null}'
+let s:jsd4 = '{key:null}'
+
+let s:jsonvals = '[true,false,null,null]'
+let s:varvals = [v:true, v:false, v:null, v:null]
+
+func Test_json_encode()
+  call assert_equal(s:json1, json_encode(s:var1))
+  call assert_equal(s:json2, json_encode(s:var2))
+  call assert_equal(s:json3, json_encode(s:var3))
+  call assert_equal(s:json4, json_encode(s:var4))
+  call assert_equal(s:json5, json_encode(s:var5))
+
+  call assert_equal(s:jsonmb, json_encode(s:varmb))
+  " no test for surrogate pair, json_encode() doesn't create them.
+
+  call assert_equal(s:jsonnr, json_encode(s:varnr))
+  if has('float')
+    call assert_equal(s:jsonfl, json_encode(s:varfl))
+    call assert_equal(s:jsonneginf, json_encode(s:varneginf))
+    call assert_equal(s:jsonposinf, json_encode(s:varposinf))
+    call assert_equal(s:jsonnan, json_encode(s:varnan))
+  endif
+
+  call assert_equal(s:jsonl1, json_encode(s:varl1))
+  call assert_equal(s:jsonl2, json_encode(s:varl2))
+  call assert_equal(s:jsonl3, json_encode(s:varl3))
+
+  call assert_equal(s:jsond1, json_encode(s:vard1))
+  call assert_equal(s:jsond2, json_encode(s:vard2))
+  call assert_equal(s:jsond3, json_encode(s:vard3))
+  call assert_equal(s:jsond4, json_encode(s:vard4))
+
+  call assert_equal(s:jsonvals, json_encode(s:varvals))
+
+  call assert_fails('echo json_encode(function("tr"))', 'E474:')
+  call assert_fails('echo json_encode([function("tr")])', 'E474:')
+
+  call assert_equal('{"a":""}', json_encode({'a': test_null_string()}))
+  call assert_equal('{"a":[]}', json_encode({"a": test_null_list()}))
+  call assert_equal('{"a":{}}', json_encode({"a": test_null_dict()}))
+
+  silent! let res = json_encode(function("tr"))
+  call assert_equal("", res)
+endfunc
+
+func Test_json_decode()
+  call assert_equal(s:var1, json_decode(s:json1))
+  call assert_equal(s:var2, json_decode(s:json2))
+  call assert_equal(s:var3, json_decode(s:json3))
+  call assert_equal(s:var4, json_decode(s:json4))
+  call assert_equal(s:var5, json_decode(s:json5))
+
+  call assert_equal(s:varmb, json_decode(s:jsonmb))
+  call assert_equal(s:varsp1, json_decode(s:jsonsp1))
+  call assert_equal(s:varsp2, json_decode(s:jsonsp2))
+
+  call assert_equal(s:varnr, json_decode(s:jsonnr))
+  if has('float')
+    call assert_equal(s:varfl, json_decode(s:jsonfl))
+  endif
+
+  call assert_equal(s:varl1, json_decode(s:jsonl1))
+  call assert_equal(s:varl2x, json_decode(s:jsonl2))
+  call assert_equal(s:varl2x, json_decode(s:jsonl2s))
+  call assert_equal(s:varl3, json_decode(s:jsonl3))
+
+  call assert_equal(s:vard1, json_decode(s:jsond1))
+  call assert_equal(s:vard2x, json_decode(s:jsond2))
+  call assert_equal(s:vard2x, json_decode(s:jsond2s))
+  call assert_equal(s:vard3, json_decode(s:jsond3))
+  call assert_equal(s:vard4x, json_decode(s:jsond4))
+
+  call assert_equal(s:varvals, json_decode(s:jsonvals))
+
+  call assert_equal(v:true, json_decode('true'))
+  call assert_equal(type(v:true), type(json_decode('true')))
+  call assert_equal(v:none, json_decode(''))
+  call assert_equal(type(v:none), type(json_decode('')))
+  call assert_equal("", json_decode('""'))
+
+  " empty key is OK
+  call assert_equal({'': 'ok'}, json_decode('{"": "ok"}'))
+  " but not twice
+  call assert_fails("call json_decode('{\"\": \"ok\", \"\": \"bad\"}')", 'E938:')
+
+  call assert_equal({'n': 1}, json_decode('{"n":1,}'))
+  call assert_fails("call json_decode(\"{'n':'1',}\")", 'E474:')
+  call assert_fails("call json_decode(\"'n'\")", 'E474:')
+
+  call assert_fails('call json_decode("\"")', "E474:")
+  call assert_fails('call json_decode("blah")', "E474:")
+  call assert_fails('call json_decode("true blah")', "E488:")
+  call assert_fails('call json_decode("<foobar>")', "E474:")
+  call assert_fails('call json_decode("{\"a\":1,\"a\":2}")', "E938:")
+
+  call assert_fails('call json_decode("{")', "E474:")
+  call assert_fails('call json_decode("{foobar}")', "E474:")
+  call assert_fails('call json_decode("{\"n\",")', "E474:")
+  call assert_fails('call json_decode("{\"n\":")', "E474:")
+  call assert_fails('call json_decode("{\"n\":1")', "E474:")
+  call assert_fails('call json_decode("{\"n\":1,")', "E474:")
+  call assert_fails('call json_decode("{\"n\",1}")', "E474:")
+  call assert_fails('call json_decode("{-}")', "E474:")
+
+  call assert_fails('call json_decode("[foobar]")', "E474:")
+  call assert_fails('call json_decode("[")', "E474:")
+  call assert_fails('call json_decode("[1")', "E474:")
+  call assert_fails('call json_decode("[1,")', "E474:")
+  call assert_fails('call json_decode("[1 2]")', "E474:")
+
+  call assert_fails('call json_decode("[1,,2]")', "E474:")
+
+  call assert_fails('call json_decode("{{}:42}")', "E474:")
+  call assert_fails('call json_decode("{[]:42}")', "E474:")
+endfunc
+
+let s:jsl5 = '[7,,,]'
+let s:varl5 = [7, v:none, v:none]
+
+func Test_js_encode()
+  call assert_equal(s:json1, js_encode(s:var1))
+  call assert_equal(s:json2, js_encode(s:var2))
+  call assert_equal(s:json3, js_encode(s:var3))
+  call assert_equal(s:json4, js_encode(s:var4))
+  call assert_equal(s:json5, js_encode(s:var5))
+
+  call assert_equal(s:jsonmb, js_encode(s:varmb))
+  " no test for surrogate pair, js_encode() doesn't create them.
+
+  call assert_equal(s:jsonnr, js_encode(s:varnr))
+  if has('float')
+    call assert_equal(s:jsonfl, js_encode(s:varfl))
+    call assert_equal(s:jsonneginf, js_encode(s:varneginf))
+    call assert_equal(s:jsonposinf, js_encode(s:varposinf))
+    call assert_equal(s:jsonnan, js_encode(s:varnan))
+  endif
+
+  call assert_equal(s:jsonl1, js_encode(s:varl1))
+  call assert_equal(s:jsonl2, js_encode(s:varl2))
+  call assert_equal(s:jsonl3, js_encode(s:varl3))
+
+  call assert_equal(s:jsd1, js_encode(s:vard1))
+  call assert_equal(s:jsd2, js_encode(s:vard2))
+  call assert_equal(s:jsd3, js_encode(s:vard3))
+  call assert_equal(s:jsd4, js_encode(s:vard4))
+
+  call assert_equal(s:jsonvals, js_encode(s:varvals))
+
+  call assert_fails('echo js_encode(function("tr"))', 'E474:')
+  call assert_fails('echo js_encode([function("tr")])', 'E474:')
+
+  silent! let res = js_encode(function("tr"))
+  call assert_equal("", res)
+
+  call assert_equal(s:jsl5, js_encode(s:varl5))
+endfunc
+
+func Test_js_decode()
+  call assert_equal(s:var1, js_decode(s:json1))
+  call assert_equal(s:var2, js_decode(s:json2))
+  call assert_equal(s:var3, js_decode(s:json3))
+  call assert_equal(s:var4, js_decode(s:json4))
+  call assert_equal(s:var5, js_decode(s:json5))
+
+  call assert_equal(s:varmb, js_decode(s:jsonmb))
+  call assert_equal(s:varsp1, js_decode(s:jsonsp1))
+  call assert_equal(s:varsp2, js_decode(s:jsonsp2))
+
+  call assert_equal(s:varnr, js_decode(s:jsonnr))
+  if has('float')
+    call assert_equal(s:varfl, js_decode(s:jsonfl))
+    call assert_equal(s:varneginf, js_decode(s:jsonneginf))
+    call assert_equal(s:varposinf, js_decode(s:jsonposinf))
+    call assert_true(isnan(js_decode(s:jsonnan)))
+  endif
+
+  call assert_equal(s:varl1, js_decode(s:jsonl1))
+  call assert_equal(s:varl2x, js_decode(s:jsonl2))
+  call assert_equal(s:varl2x, js_decode(s:jsonl2s))
+  call assert_equal(s:varl3, js_decode(s:jsonl3))
+
+  call assert_equal(s:vard1, js_decode(s:jsond1))
+  call assert_equal(s:vard1, js_decode(s:jsd1))
+  call assert_equal(s:vard2x, js_decode(s:jsond2))
+  call assert_equal(s:vard2x, js_decode(s:jsd2))
+  call assert_equal(s:vard2x, js_decode(s:jsond2s))
+  call assert_equal(s:vard2x, js_decode(s:jsd2s))
+  call assert_equal(s:vard3, js_decode(s:jsond3))
+  call assert_equal(s:vard3, js_decode(s:jsd3))
+  call assert_equal(s:vard4x, js_decode(s:jsond4))
+  call assert_equal(s:vard4x, js_decode(s:jsd4))
+
+  call assert_equal(s:varvals, js_decode(s:jsonvals))
+
+  call assert_equal(v:true, js_decode('true'))
+  call assert_equal(type(v:true), type(js_decode('true')))
+  call assert_equal(v:none, js_decode(''))
+  call assert_equal(type(v:none), type(js_decode('')))
+  call assert_equal("", js_decode('""'))
+  call assert_equal("", js_decode("''"))
+
+  call assert_equal('n', js_decode("'n'"))
+  call assert_equal({'n': 1}, js_decode('{"n":1,}'))
+  call assert_equal({'n': '1'}, js_decode("{'n':'1',}"))
+
+  call assert_fails('call js_decode("\"")', "E474:")
+  call assert_fails('call js_decode("blah")', "E474:")
+  call assert_fails('call js_decode("true blah")', "E474:")
+  call assert_fails('call js_decode("<foobar>")', "E474:")
+
+  call assert_fails('call js_decode("{")', "E474:")
+  call assert_fails('call js_decode("{foobar}")', "E474:")
+  call assert_fails('call js_decode("{\"n\",")', "E474:")
+  call assert_fails('call js_decode("{\"n\":")', "E474:")
+  call assert_fails('call js_decode("{\"n\":1")', "E474:")
+  call assert_fails('call js_decode("{\"n\":1,")', "E474:")
+  call assert_fails('call js_decode("{\"n\",1}")', "E474:")
+  call assert_fails('call js_decode("{-}")', "E474:")
+
+  call assert_fails('call js_decode("[foobar]")', "E474:")
+  call assert_fails('call js_decode("[")', "E474:")
+  call assert_fails('call js_decode("[1")', "E474:")
+  call assert_fails('call js_decode("[1,")', "E474:")
+  call assert_fails('call js_decode("[1 2]")', "E474:")
+
+  call assert_equal(s:varl5, js_decode(s:jsl5))
+endfunc