JDB File-Append-Only Database

JDB is a lightweight, file-append-only, in-memory, non-blocking I/O database inspired by NeDB. It allows users to manipulate data directly using standard JavaScript code, eliminating the need for a separate query language. The current stable version is 0.5.5, indicating a relatively mature but perhaps slower-paced development cycle without explicit release cadence information. Key differentiators include its lightweight core (approx. 200 lines), direct JavaScript data manipulation, promise support, and both standalone server and in-application library modes. It operates by appending JavaScript commands to a file, which are then re-executed on startup to reconstruct the database's in-memory state. Periodically, the database file can be compacted into a single JSON object to optimize storage and startup time.