Info

This test benchmarks JSON 3 against other JSON implementations.

The following implementations support parsing and serializing:

• JSON 3: Uses a modified, character-based recursive descent parser.
• JSON 2: Uses eval and a series of validation RegExps.

The following implementations only support parsing:

• json-parse: Uses a character-based recursive descent parser.
• json-parse-state: Uses a state machine parser.
• json-sans-eval: Uses a non-validating RegExp.
• evalJSON: Uses a RegExp-based recursive descent parser.

Preparation code

<!-- JSON 3 v3.2.2 -->
<script>
  // Disable the native JSON implementation.
  this.JSON = null;
</script>
<script src="http://bestiejs.github.com/json3/lib/json3.min.js"></script>
<!-- JSON 2 -->
<script>
  // Set up JSON 2.
  this.JSON3 = this.JSON;
  this.JSON = null;
</script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/json2/20110223/json2.js"></script>
<script>
  this.JSON2 = this.JSON;
  this.JSON = null;
</script>
<!-- `json-parse-state` (Crockford's state machine parser) -->
<script src="http://dl.dropbox.com/u/43343137/json_parse_state.js"></script>
<script>
  // `json-parse` is exposed via the `json_parse` function as well.
  this.json_parse_state = this.json_parse;
</script>
<!-- `json-parse` (Crockford's recursive descent parser) -->
<script src="http://dl.dropbox.com/u/43343137/json_parse.js"></script>
<!-- Mike Samuel's `json-sans-eval` -->
<script src="http://json-sans-eval.googlecode.com/svn/trunk/src/json_sans_eval.js"></script>
<!-- Asen Bozhilov's `evalJSON` -->
<script src="http://dl.dropbox.com/u/43343137/evalJSON.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    var value = '{"kitcambridge":"Kit","contributors":{"jdalton":"John-David","mathias":"Mathias"},"list":[1,2,3],"number":5,"date":"2012-04-25T14:08:36.879Z","boolean":true,"nil":null}';
  };
</script>

Preparation code output

Test runner

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JSON3.parse(value);

JSON2.parse(value);

json_parse_state(value);

json_parse(value);

jsonParse(value);

evalJSON(value);

eval('(' + value + ')');

if(!/^([\s\[\{]*(?:"(?:\\.|[^"])+"|-?\d[\d\.]*(?:[Ee][+-]?\d+)?|null|true|false|)[\s\]\}]*(?:,|:|$))+$/.test(value)) {
  throw new SyntaxError("Invalid characters in JSON");
}
eval('(' + value + ')');

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Kit Cambridge on 5th May 2012
• Revision 2: published on 15th May 2012
• Revision 3: published by Mike McCaughan on 17th May 2012
• Revision 4: published on 22nd May 2012
• Revision 5: published on 22nd May 2012
• Revision 12: published on 8th October 2012
• Revision 14: published on 21st December 2012
• Revision 15: published by 3E on 24th December 2012
• Revision 17: published on 7th February 2013
• Revision 18: published on 11th February 2013
• Revision 19: published on 28th February 2013
• Revision 20: published on 21st March 2013
• Revision 21: published on 23rd March 2013

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