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This is accomplished with built-in synchronization API, which can download or upload data to IBM i, and a jsonDB database driver. jsonDB is a simple NoSQL database shipped with Profound.js. The jsonDB driver supports supports Record Level Access API for both reading and updating information while storing and managing the data offline in JSON (JavaScript Object Notation) format.
The jsonDB driver is meant to be used with smaller sets of data. Database files with 100K+ records may not synchronize efficiently and perform well when used with the jsonDB driver; therefore, you should subset the data accordingly when working with large databases. The jsonDB driver does not lock records.