Skip to main content

Logging for Express - Logging Requests through Morgan Middleware

Logging requests for your Express App can be accomplished using Morgan. It is a simple to use package.

HOW TO INSTALL?

Install Morgan using Node Package Manager (NPM)
npm install --save morgan

HOW TO INCLUDE?

Include Morgan middleware in your application in the following way in the main app.js/server.js
const morgan = require('morgan');

HOW TO USE?

Finally use it as a middleware after creating express instance.
app.use(morgan('combined'));
On running your application, you will see logs being printed on server side console. One of the example of logs is as follows:
::1 - - [28/Jun/2019:06:07:27 +0000] "GET / HTTP/1.1" 304 - "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"

SAVE LOGS TO FILE

Import fs module into your express app
const fs = require('fs');
Set a constant that will write incoming logs into a file named access.log
const accessLogStream = fs.createWriteStream(
path.join(__dirname, 'access.log'),
{ flags: 'a' }
);
accessLogStream is the constant
fs.createWriteStream writes to the file.
The first argument defines where to write, i.e. the file path.
Second argument { flags: 'a' } defines that the incoming logs to be appended.
Finally feed this file to morgan.
app.use(morgan('combined', { stream: accessLogStream }));

That's it folks, you are set!

Comments

Post a Comment

Popular posts from this blog

Python - List - Append, Count, Extend, Index, Insert, Pop, Remove, Reverse, Sort

🐍 Advance List List is widely used and it's functionalities are heavily useful. Append Adds one element at the end of the list. Syntax list1.append(value) Input l1 = [1, 2, 3] l1.append(4) l1 Output [1, 2, 3, 4] append can be used to add any datatype in a list. It can even add list inside list. Caution: Append does not return anything. It just appends the list. Count .count(value) counts the number of occurrences of an element in the list. Syntax list1.count(value) Input l1 = [1, 2, 3, 4, 3] l1.count(3) Output 2 It returns 0 if the value is not found in the list. Extend .count(value) counts the number of occurrences of an element in the list. Syntax list1.extend(list) Input l1 = [1, 2, 3] l1.extend([4, 5]) Output [1, 2, 3, 4, 5] If we use append, entire list will be added to the first list like one element. Extend, i nstead of considering a list as one element, it joins the two lists one after other. Append works in the following way. Input l1 = [1, 2, 3] l1.append([4, 5]) Output...
Post a Comment
Read more

Difference between .exec() and .execPopulate() in Mongoose?

Here I answer what is the difference between .exec() and .execPopulate() in Mongoose? .exec() is used with a query while .execPopulate() is used with a document Syntax for .exec() is as follows: Model.query() . populate ( 'field' ) . exec () // returns promise . then ( function ( document ) { console . log ( document ); }); Syntax for .execPopulate() is as follows: fetchedDocument . populate ( 'field' ) . execPopulate () // returns promise . then ( function ( document ) { console . log ( document ); }); When working with individual document use .execPopulate(), for model query use .exec(). Both returns a promise. One can do without .exec() or .execPopulate() but then has to pass a callback in populate.
1 comment
Read more

Resolve: Uncaught TypeError: firebase.database is not a function

If you are getting the error: Uncaught TypeError: firebase.database is not a function Resolve it by including firebase-database.js in your html page as follows: <!-- The core Firebase JS SDK is always required and must be listed first --> <script defer src = "https://www.gstatic.com/firebasejs/6.2.4/firebase-app.js" ></script> <script defer src = "https://www.gstatic.com/firebasejs/3.1.0/firebase-database.js" ></script> That is it. Let me know if this was helpful.
Post a Comment
Read more