Very basic decoding of a JWT

JWT.java

public class JWT {

    private static ObjectMapper objectMapper = new ObjectMapper();

    public static Map<String, Object> of(String token) {
        String[] parts = token.split("\\.");
        String payload = parts[1];
        String json = new String(Base64.getUrlDecoder().decode(payload), StandardCharsets.UTF_8);
        TypeReference<HashMap<String,Object>> typeRef = new TypeReference<HashMap<String,Object>>() {};
        try {
            return objectMapper.readValue(json, typeRef);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }
}