Express.js res.status() Function

The res.status() function set the HTTP status for the response. It is a chainable alias of Node’s response.statusCode.

Syntax:

res.status( code )

Parameter: This function accepts single parameter code that holds the HTTP status code.

Returns: It returns an Object.

Installation of express module:

1. You can visit the link to Install express module. You can install this package by using this command.

   npm install express

2. After installing the express module, you can check your express version in command prompt using the command.

   npm version express

3. After that, you can create a folder and add a file for example, index.js. To run this file you need to run the following command.

   node index.js

Example 1:
Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

// Without middleware
app.get('/user', function(req, res){
    res.status(200).send("User Page");
})

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed express module using the following command:

   npm install express

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now open browser and go to http://localhost:3000/user, on your screen and you will see the following output:

   User Page

Example 2:
Filename: index.js

var express = require('express');
const path = require('path');
var app = express();
var PORT = 3000;

//with middleware
app.use('/', function(req, res, next){
    res.status(200).send("Status Working");
   next();
});

app.get('/', function(req, res){
    console.log("Home Page!")
    res.send();
});

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now open the browser and go to http://localhost:3000/, now check your console and you will see the following output:

Server listening on PORT 3000
Home Page!

And you will see the following output on your browser screen:

Status Working

Reference: https://expressjs.com/en/5x/api.html#res.status