Middleware to make logs for requests in NodeJs - ExpressJs

log-requests-express-middleware.js

// Mongoose model to store logs
logModel = () => {
  const db = require('../lib/db');
  const Schema = db.Schema;

  const logsSchema = new Schema({
    method: { type: String, trim: true },
    url: { type: String, trim: true },
    query: { type: Object, },
    params: { type: Object, },
    body: { type: Object, },
    response: { type: Object, },
    key: { type: String, unique: true},
  })

  return db.model('Logs', logsSchema)
}

const model = logModel()
logRequests = async (req, res, next) => {
  try {
    const { query, params, body, originalUrl, method } = req;
    let oldSend = res.send

    res.send = async (data) => {
      // @todo: implement not repetition validating key attribute
      await new model({
        method,
        url: originalUrl,
        body,
        query,
        params,
        response: JSON.stringify(data),
        key: `${method}${originalUrl}${JSON.stringify(body)}${JSON.stringify(query)}${JSON.stringify(params)}`
      }).save()

      // console.log('REQUEST:', method, originalUrl, query, params, body)
      // console.log('RESPONSE:', data)

      res.send = oldSend
      return res.send(data)
    }
    next()

  } catch (error) {
    console.log(error)
    next()
  }
}