@Override
    public String format(String content, boolean isLineStart, String indentation, int[] positions) {
        if (CommonUtils.isEmpty(content)) {
            return content;
        }
        JsonElement jsonElement = JsonParser.parseString(content);

        return GSON_FORMATTED.toJson(jsonElement);
    }
The formatting strategy that transforms SQL keywords to upper case
plugins/org.jkiss.dbeaver.ui.editors.json/src/org/jkiss/dbeaver/ui/editors/json/JSONFormattingStrategy.java