Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
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Pro Great routing API
Express' extremely powerful routing API allows developers to do tasks ranging from building a REST API to building the routes for a simple web app and then take it to the next level by using route parameters and query strings.
Pro Support for a lot of plugins
Express takes advantage of Node's NPM to distribute and install countless plugins made by third parties which solve almost anything a developer would want to do with Express.
Pro Relatively mature
Being a somewhat old Node.js web app framework and being one of the most widely used frameworks, Express.js has matured quite a lot during all that time. It's more stable than its competitors and a huge community backing it.
Pro Great for beginner Node.js programmers
With a little learning curve, it is a good choice for new NodeJS developers to get started quickly. Express boasts great, thorough documentation.
Pro Has the largest userbase
It's by far the most popular framework for node.
Pro Setting up is very easy
Setting up a new Express project is very easy. It consists of installing a handful of libraries through NPM run a single
npm install and everything is ready to go.
Pro Great supportive community
Express has a big community with a lot of guides and tutorials written about it by developers that have been using it for quite some time.
Pro Good Oauth/Facebook integration with connect module
You can easily add oAuth integration/social logins to your next web app without much hassle, using this authentication middleware for connect.
Pro Has detailed information
Very simple and fast.
Pro Massive ecosystem of middleware
If you have not already checked out the Express.js ecosystem of middleware, you should.
Pro Express.js is in the Node.js Foundation Incubator Program
Con No single recommended way of doing something
Express considers itself to be a "minimalistic unopinionated framework", it basically lets the developer determine how their project will be organized. On one hand, this gives anyone terrific power and flexibility to use any library they want for a certain task and to organize their project structure however they want. But on the other hand, there's no single recommended way of organizing things, which can be a trap for beginners and experienced developers alike and result in unmaintainable projects.