🚀 Big News: Socket Acquires Coana to Bring Reachability Analysis to Every Appsec Team.Learn more

express

Advanced tools

Socket logo

Install Socket

Detect and block malicious and high-risk dependencies

Install
e

express

Fast, unopinionated, minimalist web framework

4.9.8
98

Supply Chain Security

92

Vulnerability

100

Quality

86

Maintenance

100

License

Medium CVE

Vulnerability

Contains a medium severity Common Vulnerability and Exposure (CVE).

Found 1 instance in 1 package

Network access

Supply chain risk

This module accesses the network.

Found 1 instance in 1 package

Dependencies have 9 high alerts.

High CVE

Version published
Weekly downloads
44M
2.09%
Maintainers
7
Weekly downloads
 
Created
Issues
190

What is express?

Express is a fast, unopinionated, minimalist web framework for Node.js. It is designed for building web applications and APIs. It simplifies the server creation process that is already available in Node.js and provides many features that make web application development fast and easy.

What are express's main functionalities?

Middleware

Middleware functions are functions that have access to the request object (req), the response object (res), and the next middleware function in the application’s request-response cycle. These functions can perform any operations, execute any code, modify the request and response objects, and end the request-response cycle.

app.use((req, res, next) => {
  console.log('Middleware function');
  next();
});

Routing

Routing refers to determining how an application responds to a client request to a particular endpoint, which is a URI (or path) and a specific HTTP request method (GET, POST, etc.). Each route can have one or more handler functions, which are executed when the route is matched.

app.get('/users/:userId', (req, res) => {
  res.send('User ' + req.params.userId);
});

Serving Static Files

Express provides a built-in middleware express.static to serve static files, such as images, CSS, JavaScript files, etc. You simply need to pass the name of the directory where you keep your static assets to the express.static middleware to start serving the files directly.

app.use(express.static('public'))

Template Engines

Express allows you to set up template engines to dynamically render HTML on the server. It's a way to define HTML templates and inject data into them before sending them to the client.

app.set('view engine', 'pug');
app.get('/', (req, res) => {
  res.render('index', { title: 'Hey', message: 'Hello there!' });
});

Error Handling

Express provides a way to handle errors via middleware. You can define error-handling middleware functions in the same way as other middleware functions, except with four arguments instead of three, specifically with the signature (err, req, res, next).

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});

Other packages similar to express

FAQs

Package last updated on 18 Oct 2014

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts