expressjsHow do I set a header using Express.js?

Express.js is a web application framework for Node.js. It is used to create web applications and APIs. To set a header using Express.js, use the set method of the response object.

Example code

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.set('Content-Type', 'text/html');
  res.send('<h1>Hello World</h1>');
});

app.listen(3000);

Output example

Server listening on port 3000

The code above sets the response header to Content-Type: text/html. This tells the browser to render the response as an HTML page.

The set method takes two parameters: the header name and the header value. It is also possible to set multiple headers at once using the set method.

Example

res.set({
  'Content-Type': 'text/html',
  'X-Powered-By': 'Express'
});

Helpful links

• Express.js Documentation
• Express.js Tutorial

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