Abstract With the advent of Web technology, the Web is full of unstructured data called Big Data. However, these data are not easy to collect, access, and process at large scale. Web Crawling is an optimization problem. Site-specific crawling of various social media platforms, e-Commerce websites, Blogs, News websites, and Forums is a requirement for various business organizations to answer a search quarry from webpages. Indexing of huge number of webpage requires a cluster with several petabytes of usable disk. Since the NoSQL databases are highly scalable, use of NoSQL database for storing the Crawler data is increasing along with the growing popularity of NoSQL databases. This chapter discusses about the application of NoSQL database in Web Crawler application to store the data collected by the Web Crawler.