Lowdb is a lightweight local data persistence library that manages application state as a JSON document. It functions as a database utility that stores information directly in local files or browser storage, removing the requirement for a dedicated database server or complex infrastructure. By treating stored data as standard objects and arrays, it provides a straightforward interface for managing application information.
The library distinguishes itself through a modular adapter-based architecture that decouples data manipulation from the underlying storage medium. This design allows for the implementation of custom storage backends, including support for data transformations like encryption or compression. It also maintains a complete copy of the database in volatile memory, which enables high-speed operations and facilitates the use of in-memory storage modes to accelerate automated test suites.
Beyond basic storage, the project supports data integrity through atomic write serialization, which ensures that the entire state is saved as a single operation to prevent corruption. It also provides mechanisms for schema validation, allowing developers to check database content against predefined structures to maintain consistent data formats. The library can be extended by integrating third-party utility libraries for complex queries or by linking database adapters to web servers to expose data through network endpoints.
