Let’ Check all popular Mean Stack tools:
Passport.js is an authentication middleware for Node.js. It provides you a choice of over 300 different paths of authenticating your app including username and password model, login via Facebook, Google, Twitter etc., and many other. It’s absolutely easy to implement with any Express.js app.
Chai is a TDD and BDD assertion framework for Node.js which can be coupled with any testing framework (like Mocha.js we just mentioned). We use Mocha.js to run asynchronous testes, but Chai assists us to verify the test results. Chai can be run in a browser or with Node.js. As an assertion tool, we use Chai with its rich plugins (ex. chai-as-promised, chai-subset, chai-things). If we required to test Node.js HTTP servers, we usually use Super Test.
PM2 is a process manager for Node.js applications. It’s easy to use and gives many useful built-in attributes (like load balancer or watch mode).
A best substitute for those who use Angular.js is Vue.js. If you don’t want to make a complex web app and have to configure routings, controllers and services then Vue.js could be the feasible solution you’re looking for. This framework is focused on a View Model – you get attributes of larger frameworks in a lighter version for your single page applications.