expressjsHow can I use Express.js and Helmet to secure my web application?

Express.js and Helmet can be used to secure a web application by setting up authentication, authorization, and encryption.

1. Authentication: Authentication can be configured using passport.js, an authentication middleware for Node.js. Passport.js can be used to authenticate users with a username and password.

Example code

const passport = require('passport');

app.post('/login', passport.authenticate('local', {
  successRedirect: '/',
  failureRedirect: '/login'
}));

2. Authorization: Authorization can be configured using Express.js middleware. Middleware can be used to restrict access to certain routes based on user roles.

Example code

function checkPermission(role) {
  return function(req, res, next) {
    if (req.user.role === role) {
      next();
    } else {
      res.status(403).send('Unauthorized');
    }
  }
}

app.get('/admin', checkPermission('admin'), (req, res) => {
  res.send('Welcome Admin!');
});

3. Encryption: Encryption can be configured using Helmet. Helmet is a collection of middleware for Express.js that helps protect against common security vulnerabilities. Helmet can be used to configure TLS/SSL encryption and set HTTP security headers.

Example code

const helmet = require('helmet');

app.use(helmet());

Output example

No output.

Helpful links

• Passport.js
• Express.js Middleware
• Helmet

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