Logging Middleware Microservice – Nginx

I am required to save logs into a MySQL database of each request and response made to the backend. The issue is that we are migrating to microservices architecture. The backend was made with NodeJS and Express, and it has a middleware that does this task. Currently, it has this middleware attached to each microservice.

I would like to isolate this middleware as its own microservice. The issue is that I don’t know how to redirect the traffic this way. This is how I would like to manage it:

I would like to do it this way, because we can make changes or add features to the middleware without having to implement it in each microservice. This is the middleware’s code:

const connection = require("../database/db");

const viewLog = (req, res, next) => {
  const oldWrite = res.write,
    oldEnd = res.end,
    chunks = [],
    now = new Date();

  res.write = function (chunk) {
    chunks.push(chunk);
    oldWrite.apply(res, arguments);
  };

  res.end = function (chunk, error) {
    if (chunk) chunks.push(chunk);

    const bodyRes = Buffer.concat(chunks).toString("utf8");

    connection.query("CALL HospitalGatifu.insertLog(?,?,?,?,?)", [
      `[${req.method}] - ${req.url}`,
      `${JSON.stringify(req.body) || "{}"}`,
      bodyRes,
      res.statusCode === 400 ? 1 : 0,
      now,
    ]);

    oldEnd.apply(res, arguments);
  };

  next();
};

module.exports = viewLog;

I think there might be a way to manage this with Nginx which is the reverse proxy that we are using. I would like to get an approach of how to change the logs middleware.