JSON.stringifyでオブジェクトをいい感じに整形できます.
あまり知られていない気がしたので,皆様にお知らせしようと思います.
まずこれを読んでください.
JSON.stringify(value, replacer, space) value any JavaScript value, usually an object or array. replacer an optional parameter that determines how object values are stringified for objects. It can be a function or an array of strings. space an optional parameter that specifies the indentation of nested structures. If it is omitted, the text will be packed without extra whitespace. If it is a number, it will specify the number of spaces to indent at each level. If it is a string (such as '\t' or ' '), it contains the characters used to indent at each level.
https://github.com/douglascrockford/JSON-js/blob/master/json2.js
次に,こんなのを用意してみます.第三引数にインデントを指定しています.
var obj = {"uri":"http://kindai.ndl.go.jp/info:ndljp/pid/890720","title":"後の荒浪五郎","author":"松月堂,楳林;丸山,平次郎","x":879.9878571428574,"y":162.4457142857143,"width":2828.1225000000004,"height":2455.4464285714303,"version":1.7}; print(JSON.stringify(obj, null, " "));
実行すると,たしかに,いい感じに整形されました.
% v8 j.js { "uri": "http://kindai.ndl.go.jp/info:ndljp/pid/890720", "title": "後の荒浪五郎", "author": "松月堂,楳林;丸山,平次郎", "x": 879.9878571428574, "y": 162.4457142857143, "width": 2828.1225000000004, "height": 2455.4464285714303, "version": 1.7 }