// Cleanup white-space beforehand.
public static String formatJSON(String input) {
	int tabs = 0;
	boolean quoted = false;
	StringBuilder builder = new StringBuilder(input);
	for (int index = 0; index < builder.length(); index++) {
		char c = builder.charAt(index);
		switch (c) {
			case '"':
				if (quoted && builder.charAt(index - 1) != '\\')
					quoted = false;
				else
					quoted = true;
				break;
			case '{':
			case '[':
				tabs++;
				builder.insert(index + 1, '\n');
				break;
			case '}':
			case ']':
				tabs--;
				builder.insert(index++, '\n');
				for (int t = 0; t < tabs; t++)
					builder.insert(index++, '\t');
				break;
			case ':':
				builder.insert(index++, ' ');
				builder.insert(index++ + 1, ' ');
				break;
			case ',':
				builder.insert(index + 1, '\n');
				break;
			case '\n':
				for (int t = 0; t < tabs; t++)
					builder.insert(++index, '\t');
				break;
		}
	}
	return builder.toString();
}