Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.
Express is a fast, unopinionated, minimalist web framework for Node.js, providing a robust set of features for web and mobile applications.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need. MongoDB is an open-source database that stores data in (BSON), a JSON-like documents. It's a popular choice for modern web and mobile applications.