When building an application, we often need data to show realistically how it works. Creating a database and filling it with realistic sample data can be quite time-consuming. Faker.js is a library that can be used both standalone of in a node.js environment to mock large amounts of realistic data. during building an awesome application. There are many popular JavaScript libraries for generating mock data. In this article, we will be going through Faker.js which is the best-known library, but feel free to try the others too.