--- a/runtime/syntax/json.vim
+++ b/runtime/syntax/json.vim
@@ -1,16 +1,143 @@
 " Vim syntax file
-" Language:		JSON
-" Maintainer:		David Barnett <daviebdawg+vim@gmail.com>
-" Last Change:		2014 Jul 16
+" Language:	JSON
+" Maintainer:	Eli Parra <eli@elzr.com>
+" Last Change:	2014 Aug 23
+" Version:      0.12
+
+if !exists("main_syntax")
+  if version < 600
+    syntax clear
+  elseif exists("b:current_syntax")
+    finish
+  endif
+  let main_syntax = 'json'
+endif
+
+syntax match   jsonNoise           /\%(:\|,\)/
+
+" NOTE that for the concealing to work your conceallevel should be set to 2
 
-" For version 5.x: Clear all syntax items.
-" For version 6.x and later: Quit when a syntax file was already loaded.
-if exists('b:current_syntax')
-  finish
+" Syntax: Strings
+" Separated into a match and region because a region by itself is always greedy
+syn match  jsonStringMatch /"\([^"]\|\\\"\)\+"\ze[[:blank:]\r\n]*[,}\]]/ contains=jsonString
+if has('conceal')
+	syn region  jsonString oneline matchgroup=jsonQuote start=/"/  skip=/\\\\\|\\"/  end=/"/ concealends contains=jsonEscape contained
+else
+	syn region  jsonString oneline matchgroup=jsonQuote start=/"/  skip=/\\\\\|\\"/  end=/"/ contains=jsonEscape contained
+endif
+
+" Syntax: JSON does not allow strings with single quotes, unlike JavaScript.
+syn region  jsonStringSQError oneline  start=+'+  skip=+\\\\\|\\"+  end=+'+
+
+" Syntax: JSON Keywords
+" Separated into a match and region because a region by itself is always greedy
+syn match  jsonKeywordMatch /"\([^"]\|\\\"\)\+"[[:blank:]\r\n]*\:/ contains=jsonKeyword
+if has('conceal')
+   syn region  jsonKeyword matchgroup=jsonQuote start=/"/  end=/"\ze[[:blank:]\r\n]*\:/ concealends contained
+else
+   syn region  jsonKeyword matchgroup=jsonQuote start=/"/  end=/"\ze[[:blank:]\r\n]*\:/ contained
 endif
 
-" Use JavaScript syntax. JSON is a subset of JavaScript.
-runtime! syntax/javascript.vim
-unlet b:current_syntax
+" Syntax: Escape sequences
+syn match   jsonEscape    "\\["\\/bfnrt]" contained
+syn match   jsonEscape    "\\u\x\{4}" contained
+
+" Syntax: Numbers
+syn match   jsonNumber    "-\=\<\%(0\|[1-9]\d*\)\%(\.\d\+\)\=\%([eE][-+]\=\d\+\)\=\>\ze[[:blank:]\r\n]*[,}\]]"
+
+" ERROR WARNINGS **********************************************
+if (!exists("g:vim_json_warnings") || g:vim_json_warnings==1)
+	" Syntax: Strings should always be enclosed with quotes.
+	syn match   jsonNoQuotesError  "\<[[:alpha:]][[:alnum:]]*\>"
+	syn match   jsonTripleQuotesError  /"""/
+
+	" Syntax: An integer part of 0 followed by other digits is not allowed.
+	syn match   jsonNumError  "-\=\<0\d\.\d*\>"
+
+	" Syntax: Decimals smaller than one should begin with 0 (so .1 should be 0.1).
+	syn match   jsonNumError  "\:\@<=[[:blank:]\r\n]*\zs\.\d\+"
+
+	" Syntax: No comments in JSON, see http://stackoverflow.com/questions/244777/can-i-comment-a-json-file
+	syn match   jsonCommentError  "//.*"
+	syn match   jsonCommentError  "\(/\*\)\|\(\*/\)"
+
+	" Syntax: No semicolons in JSON
+	syn match   jsonSemicolonError  ";"
+
+	" Syntax: No trailing comma after the last element of arrays or objects
+	syn match   jsonTrailingCommaError  ",\_s*[}\]]"
+
+	" Syntax: Watch out for missing commas between elements
+	syn match   jsonMissingCommaError /\("\|\]\|\d\)\zs\_s\+\ze"/
+	syn match   jsonMissingCommaError /\(\]\|\}\)\_s\+\ze"/ "arrays/objects as values
+	syn match   jsonMissingCommaError /}\_s\+\ze{/ "objects as elements in an array
+	syn match   jsonMissingCommaError /\(true\|false\)\_s\+\ze"/ "true/false as value
+endif
+
+" ********************************************** END OF ERROR WARNINGS
+" Allowances for JSONP: function call at the beginning of the file,
+" parenthesis and semicolon at the end.
+" Function name validation based on
+" http://stackoverflow.com/questions/2008279/validate-a-javascript-function-name/2008444#2008444
+syn match  jsonPadding "\%^[[:blank:]\r\n]*[_$[:alpha:]][_$[:alnum:]]*[[:blank:]\r\n]*("
+syn match  jsonPadding ");[[:blank:]\r\n]*\%$"
+
+" Syntax: Boolean
+syn match  jsonBoolean /\(true\|false\)\(\_s\+\ze"\)\@!/
+
+" Syntax: Null
+syn keyword  jsonNull      null
 
-let b:current_syntax = 'json'
+" Syntax: Braces
+syn region  jsonFold matchgroup=jsonBraces start="{" end=/}\(\_s\+\ze\("\|{\)\)\@!/ transparent fold
+syn region  jsonFold matchgroup=jsonBraces start="\[" end=/]\(\_s\+\ze"\)\@!/ transparent fold
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_json_syn_inits")
+  if version < 508
+    let did_json_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+  HiLink jsonPadding         Operator
+  HiLink jsonString          String
+  HiLink jsonTest          Label
+  HiLink jsonEscape          Special
+  HiLink jsonNumber          Number
+  HiLink jsonBraces          Delimiter
+  HiLink jsonNull            Function
+  HiLink jsonBoolean         Boolean
+  HiLink jsonKeyword         Label
+
+	if (!exists("g:vim_json_warnings") || g:vim_json_warnings==1)
+	  HiLink jsonNumError        Error
+	  HiLink jsonCommentError    Error
+	  HiLink jsonSemicolonError  Error
+	  HiLink jsonTrailingCommaError     Error
+	  HiLink jsonMissingCommaError      Error
+	  HiLink jsonStringSQError        	Error
+	  HiLink jsonNoQuotesError        	Error
+	  HiLink jsonTripleQuotesError     	Error
+  endif
+  HiLink jsonQuote           Quote
+  HiLink jsonNoise           Noise
+  delcommand HiLink
+endif
+
+let b:current_syntax = "json"
+if main_syntax == 'json'
+  unlet main_syntax
+endif
+
+" Vim settings
+" vim: ts=8 fdm=marker
+
+" MIT License
+" Copyright (c) 2013, Jeroen Ruigrok van der Werven, Eli Parra
+"Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+"The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+"THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+"See https://twitter.com/elzr/status/294964017926119424