Does anyone have any recommendations for applications or browser plugins that make browsing and visualizing JSON APIs easy. Please support your answer with a reference or link to the application you recommend.
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I'm looking for the quickest way to get from a URL such as http://search.twitter.com/search.json?q=%23StackOverflow to a nicely formatted view of the data – Myster Mar 03 '10 at 01:48
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Some ideas: http://rajakannappan.blogspot.com/2014/07/json-desktop-editors.html – Franck Dernoncourt Apr 13 '15 at 03:46
7 Answers
This one looks quite good, it's a firefox plugin called JSONView
https://addons.mozilla.org/en-US/firefox/addon/10869
Also ported to a chrome extension
https://chrome.google.com/webstore/detail/chklaanhfefbnpoihckbnefhakgolnmc
Addition
Postman is an awesome stand-alone program for working with APIs
https://www.getpostman.com/

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JSONView's biggest flaw is it only handles application/json. We need support for application/*+json but according to https://github.com/bhollis/jsonview/issues/7 FireFox might not support it. – Gili Jun 18 '12 at 18:15
Johns tool is nice. Anoter nice online tool is http://jsonviewer.stack.hu/

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I'm not completely sure what you're asking.
If you're looking for a JSON viewer to examine complex JSON strings, take a look at JSON Visualizer.
If you're looking for a way to browse an API, consult that API's documentation.

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For completeness there is also this JSON Viewer
I have only tried the stand-alone, and it seems to do the basics ok. However the firefox plugin had less friction for what I was doing.
From the documentation:
The JSON View package is a set of 3 viewers available in the following flavors:
- A standalone viewer - JsonView.exe
- A plugin for Fiddler 2 (http://www.fiddler2.com/) - FiddlerJsonViewer.dll
- A visualizer for Viusal Studio 2005 - JsonVisualizer.dll

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This is a simple option. http://jsonviewer.jaycodesign.co.nz/
Just copy the JSON in and see it visualized to the right.

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Firebug in Firefox does the job when you have a url which returns json (Firebug is a must have for any web developer, if you don't have it installed already, you can get it here): with Firebug open and active navigate to your url in Firefox, in Firebug go to the Net tab, then click + sign next to your url in the grid, there should be a JSON tab available which you can use to explore your object in a tree view.

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I have firebug, don't know what I'd do without it. Mine does not have the json tab. it's v1.5.3 – Myster Mar 31 '10 at 19:47
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+1, Note: The tab does not show if the primary download is json. It works for secondary json resources. So for me JSONView does a better job for what I was looking for... but the net > json tab fills a separate role. thanks. – Myster Mar 31 '10 at 20:00