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Express Response

In Express.js, the "res" object, representing the HTTP response, is used to send data back to the client.

In an Express.js application, sending a response to a client is a fundamental operation. Express provides various methods to send responses back to clients, such as sending plain text, HTML, JSON, or files.

Send Response From Node Server:

Sending Text Response:

We can send Text responses from the server to the client machine.

Example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/', (req, res) => {
  res.send('Hello, World!');
});


app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Note: The "res.send()" method is used to send a plain text response to the client.

Sending HTML Response:

Example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/send-html', (req, res) => {
  res.send('<h1>Hi, Welcome to the Express.js world!</h1>');
});



app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

We can send HTML responses from the server to the client machine using the `res.send()` method by passing HTML markup as a string.

Note: We can send HTML content using the "res.send()" method.

Example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/json', (req, res) => {
  const data = { message: 'Hello, JSON!' };
  res.json(data);
});




app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Sending JSON Response:

We can send JSON responses from the server to the client machine. This method automatically sets the `Content-Type` header to `application/json`.

Note: The "res.json()" method is used to send a "JSON" response to the client.

Example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/notfound', (req, res) => {
  res.status(404).send('Not Found');
});


app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Status Codes:

Example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/redirect', (req, res) => {
  res.redirect('https://www.instanests.com');
});


app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

We can set the HTTP status code for the response using the "res.status()" method.

Example:

const path = require('path');
const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;


app.get('/file', (req, res) => {
  const filePath = path.join(__dirname, 'path/to/file.txt');
  res.sendFile(filePath);
});


app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Redirection:

Express provides methods for handling redirection.

Sending Files:

We can send files as responses using "res.sendFile()".

Full Code:

const path = require('path');
const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;

app.get('/', (req, res) => {
  res.send('Hello, World!');
});

app.get('/send-html', (req, res) => {
  res.send('<h1>Hi, Welcome to the Express.js world!</h1>');
});

app.get('/file', (req, res) => {
  const filePath = path.join(__dirname, 'path/to/file.txt');
  res.sendFile(filePath);
});

app.get('/redirect', (req, res) => {
  res.redirect('https://www.instanests.com');
});

app.get('/json', (req, res) => {
  const data = { message: 'Hello, JSON!' };
  res.json(data);
});

app.get('/notfound', (req, res) => {
  res.status(404).send('Not Found');
});

app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Start Server Command:

 // navigate to folder location where server.js exist

node server.js
<-- Request
Get Request -->
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Instanests provide web applications development tutorials in structured and organised manner. Explore our extensive collection of tutorials accessible for everyone. we can't warrant for correctness of all content. we constantly review our content and update to prevent from errors.

you agree to have read and accepted our Terms and Conditions and Privacy Policy.