How to write a middleware to log the url or the body parameters

Question

I am trying to implement a middle ware that accepts any incoming request and logs all the request parameters, so how can I do that using express?

I tried this code but didn't work,

//logger function
app.use(function(req, res, next){
  console.log('%s %s', req.method, req.url);
  next();
});

Thanks.

What have you tried so far? Have you looked at the node docs? BTW http://stackoverflow.com/questions/6912584/how-to-get-get-query-string-variables-in-node-js — ControlAltDel, Aug 28 '14 at 00:30
Right, so `req.body` will return an object of post data, while `req.params` will return an object of url fields. — Max, Aug 28 '14 at 00:41
`req.params` will only give you the params in your route. You'll have to parse the url. — Jordonias, Aug 28 '14 at 01:30

score 0 · Answer 1 · answered Aug 28 '14 at 03:22

0

As the comments have mentioned: see the document.

I want to warn you another thing:

do not write user's account info(e.g.: email,password) in the log file,it's dangerous!

answered Aug 28 '14 at 03:22

yangsibai

1,637
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23

score 0 · Answer 2 · answered Apr 25 '23 at 11:35

You can do something like this:

  /**
   * This is for logging entrance to a specific route.
   */
  static log(req, _res, next) {
    const {
      body,
      query,
      params,
      method,
      originalUrl,
    } = req;
    let info = `Entered ${method} ${originalUrl} `;
    if (Object.keys(body).length) info += `| body: ${JSON.stringify(body)}`;
    if (Object.keys(query).length) info += `| query: ${JSON.stringify(query)}`;
    if (Object.keys(params).length) info += `| params: ${JSON.stringify(params)}`;
    Logger.info(info);
    return next();
  }

and implement it on the route:

testRoute.get('/test', log, TestController.Test);

You can user if for all POST/PUT/GET/DELETE

How to write a middleware to log the url or the body parameters

2 Answers2