MongoDB is the most popular NoSQL database in the world. It stores data as flexible JSON-like documents instead of rigid rows and columns, letting your data model evolve as your application grows. In 2026, it powers everything from startup MVPs to the backends of eBay, Forbes, and the New York Times. MongoDB is a document-oriented database. Instead of tables with predefined columns, it stores collections of documents. Each document is a JSON object that can have any structure you choose. Two documents in the same collection can have completely different fields.
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