JSON Formatter
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Makes JSON easy to read. Open source.

Makes JSON easy to read. Open source. A fork of the original (no-longer updated) extension by Callum Locke. FEATURES • JSON & JSONP support • Syntax highlighting with 36 light and dark themes • Collapsible trees, with indent guides • Line numbers • Clickable URLs • Toggle between raw and parsed JSON • Works on any valid JSON page – URL doesn't matter • Works on local files too (if you enable this in chrome://extensions) • You can inspect the JSON by typing "json" in the console (Note: this extension might clash with other JSON highlighters/beautifiers, like ‘JSONView’, ‘Pretty JSON’ or ‘Sight’ – disable those before trying this.) PRO TIP Hold down Ctrl (or Cmd on Mac) while collapsing a tree if you want to collapse all its siblings too. PRIVACY No tracking, no advertising, and nothing else nefarious. SOURCE CODE github.com/nikrolls/json-formatter BUGS/SUGGESTIONS github.com/nikrolls/json-formatter/issues QUESTIONS twitter.com/nikrolls

4.4 out of 566 ratings

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A CJan 19, 2024

FYI for anyone saying this no longer works: there is a NEW version of this extension by callumlocke.com. Just do a search for the same name, "JSON formatter" and it should come up as one of the first results.

1 person found this review to be helpful
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Katie HamiltonSep 26, 2023

This is no longer working with the most recent version of Chrome. I'm really bummed because I have been using this for years now and have loved it!

2 out of 3 found this helpful
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Gergely GloszApr 3, 2023

FYI: Working with local files can be can turned on at "Manage Extensions" > "Allow access to file URLs"

1 person found this review to be unhelpful


  • Version
  • Updated
    May 8, 2017
  • Offered by
    Nik Rolls
  • Size
  • Languages
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.


The developer has not provided any information about the collection or usage of your data.


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