Show filename:lineno for every log message in node. Log the time, origin ip, method, and url for every express.js request.

request_logging_with_filenames.js

// patch console.log to show filename and line number for every logged message
//
// ./src/index.js:68:9     √ Connected to Sentry
// ./src/index.js:72:9     √ Connected to Stripe
// ./src/index.js:82:9     √ Connected to Backblaze
// ./src/index.js:99:9     √ Connected to FireBase
// ./src/routes/paypal.js:68:17 Error: Request failed with status code 401
//    at createError (./node_modules/axios/lib/core/createError.js:16:15)
//    at settle (./node_modules/axios/lib/core/settle.js:17:12)
//    at IncomingMessage.handleStreamEnd (./node_modules/axios/lib/adapters/http.js:236:11)
//    ...

const original_log = console.log
console.log = function() {
    const e = new Error()
    const filepath_regex = /(\/.*):(\d+):(\d+)/
    try {
        const matches = filepath_regex.exec(e.stack.split("\n")[3]);
        const filename = matches[1].replace(__dirname, '.')
        const path = `${filename}:${matches[2]}:${matches[3]}`
        original_log.apply(console, [path, ...arguments])
        // console.trace()
    } catch (e) {
        original_log.apply(console, [path, '\n', e.stack])
    }
};


// log every every request to console
//
// [2020-02-02 23:59] 127.127.127.127> GET /some/path/on/server
// [2020-02-04 00:01] 127.123.12.11>   GET /some/other/path/on/server?with=params
// ...

const app = express()

...

app.use(function(req, res, next) {
  const { method, url } = req
  if (method !== 'OPTIONS') {
    const ip = req.headers['cf-connecting-ip'] || req.headers['x-forwarded-for'] || req.connection.remoteAddress
    const ts = new Date().toISOString().replace(/T/, ' ').replace(/\..+/, '')
    log.apply(console, [`[${ts}]`, leftJustify(ip.slice(0, 20) + ">", 22), method, url])
  }
  next()
}