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Express.js is a robust framework of Node.js designed to minimize the lines of code while developing web applications by providing powerful set of libraries and tools which makes the development process faster and increases its scalability. 

Following are the advantages of using Express.js framework - 

• Provides high performance and rapid application development because of its non-blocking I/O, asynchronous programming and single-thread feature.
• Easy to customize and use.
• Contains multiple middleware components and HTTP utility methods which quickens API development and is widely used for request and response methods.
• Easy third-party integration with template engines like Jade, Vash, EJS, etc.
• Quickly identifies middleware handling error.
• Enables developers design the backend server easily with REST API(s).
• Express uses middleware to establish communication and manage data on the server-side.
• Manages application's static files and services easily.
• Fast linking to databases like MySQL, MongoDB, and Postgres.

Middleware in Express.js are the functions that can access request and response object for each path it is attached to. This chaining of middleware enables freelance Express.js developers to create reusable middleware and separate one part of code from other code. Freelance Express.js developers can modify the data or invoke the next middleware with the help of middlewares.

Following is the list of middlewares in Express.js - 

• Application-level middleware - It uses the app.use() and app.METHOD() to bind the instance of the application object with the application-level middleware.
• Router-level middleware - The working of router-level middleware is similar to that of application-level middleware except it binds the object of express.Router().
• Error Handling Middleware - Error Handling Middleware enables Express.js freelance developers to compartmentalize error logic with other code and respond accordingly. 
• Built-in middleware -Built-in middleware has inbuilt components and tools for processing data. express.json parses the given file with JSON payload, express.static provides static functionality for HTML, CSS, and images files, and express.urlencoded parses the requests with URL encoded payloads. 

CORS stands for Cross-Origin Resource Sharing. CORS allows freelance Express developers to request data from one website to another website in the browser which is prohibited normally because of the Same-Origin Policy (SOP). Moreover, the website can access numerous functionalities  and resources from a different site domain.

var exp = require ('express');

var data = express();

var body_parser = require('body-parser');

var urlEncodedParser = bodyParser.urlencoded({extended : false});

data.post('/process_post', urlEncodedParser, function (req,res){

response = {

firstName = req.body.firstName,

lastName = req.body.lastName

}

console.log(response);

})

There are two ways of configuring the properties in ExpressJS - 

• Using require.js - A file with config.json name is created in the config folder which is present inside project folder.
• Using process.env- A file named .env is created in the project folder and all the properties are added in this file and any of them can be used in server.js file.

Routing specifies the way a server responds to a client's request to a particular endpoint. AN endpoint is a path and any of the HTTP methods such as GET, PUT, POST, PATCH, etc. Each route possesses one or more handler functions that gets executed when the router is matched. The syntax usually used for routing is - 

app.METHOD(PATH,HANDLER), where METHOD can be any HTTP request methods like GET, PUT, POST, DELETE, OPTIONS, HEAD, and CONNECT.

Scaffolding allows us to create the structure layout for an application. Scaffolding allows a freelance Express.js developer create a public directory for an application, add middlewares to an application, create separate route files, and much more. In Node.js, the tool used for scaffolding is Yeoman, which uses generators to create a simple structure for your application.

If you are trying to hire a Express.js Developer. Here is the Express.js Developer Job Description that you can use in your hiring.