为什么我的(try-catch)代码在NodeJS中执行得太快?

HTTP GET 调用(使用本机http模块),我尝试 JSON.parse() end 事件被发出。我确信我得到的数据是有效的JSON,但仍然是 JSON.parse 抛出错误。我的记录显示 在应该调用之前调用。

res.on("end", () => {
  console.log('Req ended message is', body);

  try {
    var passport = JSON.parse(body);
  } catch (e) {
    w.info(
     "Cannot parse the response from : " +
     process.env.mongo_api_host +
     " | error  : " +
     e
   );
  }
  callback(passport);
 return;
});

我的日志显示:

info: Getting MongoDB passport for model : CESI
info: Cannot parse the response from : mongo_api | error  : SyntaxError: Unexpected end of JSON input
info: Req ended message is *long valid JSON data*

"Req ended message is : ... stuff" .

编辑1:

即使把 callback(passport)

      res.on("end", () => {
        try {
          console.log("Req ended message is", body);
          var passport = JSON.parse(body);
          //TODO What if you get an array ?
          if (passport._id) delete passport._id;
          callback(passport);
        } catch (e) {
          w.info(
            "Cannot parse the response from : " +
              process.env.mongo_api_host +
              " | error  : " +
              e
          );
        }
        return;
      });