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A Safari extension which makes valid JSON documents human-readable.
Download the extension and open it with Safari 5.
Once installed, load any valid JSON document. This project's most recent commit makes a good example.
The extension aims to produce the same JSON string that's been loaded as input, but because the original JSON has actually been parsed, some transformation may occur. In other words, the formatted JSON will always be equivalent to the original JSON, but in rare circumstances it may not match exactly. The only known example of this is kind of discrepancy is between number formats -- if the original JSON contains the numeric value 1e2, for example, the formatted JSON will display the value 100.