Node.js + Express-如何记录请求正文和响应正文 [英] Node.js + Express - How to log the request body and response body

问题描述

我有一个使用Node.js构建并表达的小型api. 我正在尝试创建一个记录器，我需要记录请求正文和响应正文.

I have a small api I have built using Node.js and express. I am trying to create a logger and I need log the request body AND response body.

app.use((req, res) => {

    console.log(req);            

    res.on("finish", () => {

        console.log(res);

    });

});

表达":"^ 4.16.3"，

"express": "^4.16.3",

但是，我无法在req或res对象中找到该主体.请告诉我我怎么能得到它们.谢谢.

However, i am not able to find the body in the req or res object. Please tell me how i can get them. thanks.

推荐答案

对于res.body，请尝试以下代码段:

For res.body try the following snippet:

const endMiddleware = (req, res, next) => {
  const defaultWrite = res.write;
  const defaultEnd = res.end;
  const chunks = [];

  res.write = (...restArgs) => {
    chunks.push(new Buffer(restArgs[0]));
    defaultWrite.apply(res, restArgs);
  };

  res.end = (...restArgs) => {
    if (restArgs[0]) {
      chunks.push(new Buffer(restArgs[0]));
    }
    const body = Buffer.concat(chunks).toString('utf8');

    console.log(body);

    defaultEnd.apply(res, restArgs);
  };

  next();
};

app.use(endMiddleware)

// test
// HTTP GET /
res.status(200).send({ isAlive: true });

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