问Node.js + Express -如何记录请求体和响应体

EN

var bodyParser = require('body-parser')//add this

app.use(bodyParser())//add this before any route or before using req.body

app.use((req, res) => {
  console.log(req.body); // this is what you want           

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

    console.log(res);

  });

});

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 });

app.use(function responseLogger(req, res, next) {
  const originalSendFunc = res.send.bind(res);
  res.send = function(body) {
    console.log(body);    // do whatever here
    return originalSendFunc(body);
  };
  next();
});