Node.js + Express - How to log the request body and response body

Question

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, re         


        

Answer 1

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 });

Answer 2

You need body-parser that will create body object for you in your request.
To do that npm install body-parser

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);

  });

});

Answer 3

install npm install body-parser

and use this snippet,

var express = require('express')
var bodyParser = require('body-parser')
 
var app = express()
 
// create application/json parser
var jsonParser = bodyParser.json()
 
to get json response
app.use(jsonParser, function (req, res) {
  console.log(req.body); // or console.log(res.body);
})