bdb is an embedded, low-level key-value database library specifically designed as a LevelDB backend for the bcoin full node Bitcoin implementation. It is built on top of `leveldown` (or compatible LevelDB bindings) to provide persistent storage. The package, currently at version 1.6.2, is part of the broader `bcoin-org` ecosystem, which appears to be under active maintenance, though `bdb` itself sees less frequent, direct updates. Its primary differentiator is the `bdb.key` utility, offering structured key encoding and decoding for managing complex data types common in blockchain applications, such as cryptographic hashes and integers, enabling efficient storage and retrieval. Unlike general-purpose LevelDB wrappers, `bdb` is tailored for the specific data structures and performance requirements of a Bitcoin node. It operates as a local, embedded database without a server component, similar to other NoSQL key-value stores. Release cadence is tied to the needs of the `bcoin` project, rather than independent frequent updates.
npm install bdbVerified import paths — ran on the pinned version, not inferred.
Demonstrates opening a bdb database, creating a bucket, encoding/decoding structured keys, performing batch writes, and iterating over stored key-value pairs using both callback-based and async iterators, then properly closing and cleaning up the database.
Always use `const bdb = require('bdb');` to import the module in both CommonJS and hybrid environments.Strictly define and adhere to your `bdb.key` schemas. Always use the corresponding `bdb.key.encode()` for writing and `bdb.key.decode()` for reading data, ensuring types match the definition.
Ensure all `db` instances are explicitly closed when no longer needed. Similarly, always call `iterator.end()` after completing iteration to release underlying resources, ideally within a `finally` block or using `for await...of` which handles iterator closing implicitly for async iterators.
The main `bdb` export is an object. To create a database instance, use `bdb.create()`. For key utilities, use `bdb.key()`.
Ensure the Node.js process has read and write permissions for the database directory path provided to `bdb.create()`. Check directory ownership and permissions.
bdb is CommonJS. If your project is ESM, you might need to use dynamic `import('bdb')` or convert the surrounding code to CommonJS, or use a build tool to handle the interoperability.