JSON Formatter

public static String format(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);
        if (quoted && c != '"')
            continue;
        switch (c) {
            case '"':
                quoted = !(quoted && builder.charAt(index - 1) != '\\');
                continue;
            case ':':
                builder.insert(++index, ' ');
                continue;
            case '{':
            case '[':
                tabs++;
            case ',':
                builder.insert(index + 1, '\n');
                continue;
            case '}':
            case ']':
                tabs--;
                builder.insert(index++, '\n');
                for (int t = 0; t < tabs; t++)
                    builder.insert(index++, '\t');
                continue;
            case '\n':
                for (int t = 0; t < tabs; t++)
                    builder.insert(++index, '\t');
                continue;
        }
    }
    return builder.toString();
}