Express Middlewares

Explore The Power Of Express Middlewares In Node.js!  Learn How They Work And Enhance Your Web Applications.

What Are  Middlewares? 

Express Middlewares Are Functions That Execute During The Request-Response Cycle In An Express Application.

Middlewares Are Used To Handle Tasks Like Logging, Authentication, And More.

function logger(req, res, next) {    console.log(`${req.method} ${req.url}`);    next();  }

Types Of Express Middlewares 

⚡ Application-Level:  Applied Across The Entire App.

⚡ Router-Level: Applied To Specific Routes.

 ⚡ Error-Handling: Handles Errors In The Application.

app.use('/user', userRouter);

How To Use Built-In Middlewares 

Express Provides Built-In Middlewares For Common Tasks Like Parsing JSON Or Serving Static Files.

Built-In Middlewares Simplify Common Operations Like Parsing Request Bodies And Serving Files.

app.use(express.json()); app.use(express.static('public'));

Creating Custom Middlewares 

Creating A Custom Middleware: Define A Function With req, res, And next Parameters.

Built-In Middlewares Simplify Common Operations Like Parsing Request Bodies And Serving Files.

function logger(req, res, next) {    console.log(`Request Method: ${req.method}`);    next(); } app.use(logger);

Using Third-Party Middlewares 

Third-Party Middlewares Extend The Functionality Of Express Applications, Such As cors For Handling Cross-Origin Requests.

Third-Party Middlewares Provide Ready-To-Use Solutions For Common Needs In Web Development.

const cors = require('cors'); app.use(cors());

Tips For Organizing Middlewares 

– Order Matters: Place Middlewares In The Correct Sequence. – Modularize: Split Middlewares Into Separate Files. – Reuse: Create Reusable Middlewares For Common Tasks.

module.exports = function (req, res, next{      console.log('Logger Middleware');     next();  };  const logger = require('./middlewares/logger');  app.use(logger); 

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