{"id":16449,"library":"mongodb-level","title":"MongoDB Abstract-Level Database","description":"mongodb-level is an implementation of the `abstract-level` interface, providing a LevelDB-like key-value store API that is backed by a MongoDB database. This allows developers to interact with MongoDB using familiar operations such as `put`, `get`, `del`, and `iterator`, abstracting away the direct MongoDB Node.js driver API. Currently at version 0.0.4, the library is in an early, pre-stable development phase, indicating that its API may evolve. Given its early stage and specific niche, the release cadence is likely slow and focused on stability. Its key differentiator lies in offering a standardized LevelDB API over MongoDB, which can be advantageous for projects migrating from other LevelDB implementations or those aiming to standardize their data access layer across different storage backends.","status":"active","version":"0.0.4","language":"javascript","source_language":"en","source_url":"https://github.com/tinacms/mongodb-level","tags":["javascript","level","leveldb","leveldown","levelup","memory","mongodb","typescript"],"install":[{"cmd":"npm install mongodb-level","lang":"bash","label":"npm"},{"cmd":"yarn add mongodb-level","lang":"bash","label":"yarn"},{"cmd":"pnpm add mongodb-level","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"Runtime dependency for connecting to and interacting with a MongoDB database.","package":"mongodb","optional":false}],"imports":[{"note":"The primary class for creating a MongoDB-backed LevelDB-compatible instance. This package is primarily ESM-first with TypeScript types.","wrong":"const MongoDBLevel = require('mongodb-level')","symbol":"MongoDBLevel","correct":"import { MongoDBLevel } from 'mongodb-level'"},{"note":"Type import for `AbstractLevel` interface, useful for type-checking instances of `MongoDBLevel` against the common LevelDB API contract. Not directly exported by `mongodb-level` itself, but represents the interface it implements.","symbol":"AbstractLevel","correct":"import type { AbstractLevel } from 'abstract-level'"},{"note":"Required for establishing a connection to MongoDB, which `mongodb-level` often leverages internally or expects an existing connection URI.","symbol":"MongoClient","correct":"import { MongoClient } from 'mongodb'"}],"quickstart":{"code":"import { MongoDBLevel } from 'mongodb-level';\nimport { MongoClient } from 'mongodb';\n\nconst MONGODB_URI = process.env.MONGODB_URI ?? 'mongodb://localhost:27017';\nconst DB_NAME = process.env.DB_NAME ?? 'test_level_db';\nconst COLLECTION_NAME = process.env.COLLECTION_NAME ?? 'level_collection';\n\nasync function run() {\n  let client: MongoClient | undefined;\n  let db: MongoDBLevel | undefined;\n  try {\n    client = await MongoClient.connect(MONGODB_URI);\n    console.log('Connected to MongoDB.');\n\n    db = new MongoDBLevel({\n      dbName: DB_NAME,\n      collectionName: COLLECTION_NAME,\n      mongoClient: client\n    });\n    await db.open();\n    console.log('MongoDBLevel opened.');\n\n    // 1. Put a key-value pair\n    await db.put('hello', 'world');\n    console.log(\"Put 'hello': 'world'\");\n\n    // 2. Get the value for a key\n    const value = await db.get('hello');\n    console.log(`Get 'hello': ${value}`); // Expected: world\n\n    // 3. Try to get a non-existent key\n    try {\n      await db.get('nonExistentKey');\n    } catch (error: any) {\n      if (error.code === 'LEVEL_NOT_FOUND') {\n        console.log('Successfully caught NotFoundError for nonExistentKey.');\n      } else {\n        throw error;\n      }\n    }\n\n    // 4. Delete a key\n    await db.del('hello');\n    console.log(\"Deleted 'hello'\");\n\n    // 5. Verify deletion\n    try {\n      await db.get('hello');\n    } catch (error: any) {\n      if (error.code === 'LEVEL_NOT_FOUND') {\n        console.log(\"Successfully verified 'hello' is deleted.\");\n      } else {\n        throw error;\n      }\n    }\n\n  } catch (err) {\n    console.error('An error occurred:', err);\n  } finally {\n    if (db) await db.close();\n    if (client) await client.close();\n    console.log('Database and MongoDB client closed.');\n  }\n}\n\nrun();","lang":"typescript","description":"Demonstrates basic `mongodb-level` operations (put, get, del) against a local or cloud MongoDB instance, including error handling for non-existent keys. It requires a MongoDB server to be running or a valid connection string to MongoDB Atlas."},"warnings":[{"fix":"Always pin to exact versions (e.g., `\"mongodb-level\": \"0.0.4\"`) to prevent unexpected breaking changes with minor or patch updates during pre-1.0 development.","message":"The package is currently at version 0.0.4, indicating it is in a very early, pre-stable development stage. The API is subject to change without adhering to semantic versioning until a 1.0 release.","severity":"gotcha","affected_versions":"<1.0.0"},{"fix":"Always use `await` with `mongodb-level` operations or chain `.then()` and `.catch()` to ensure proper asynchronous flow control and error handling.","message":"As with any `abstract-level` implementation, operations are inherently asynchronous. Mixing synchronous calls or incorrect Promise handling can lead to unexpected behavior or unhandled rejections.","severity":"gotcha","affected_versions":">=0.0.1"},{"fix":"Profile your MongoDB queries and ensure appropriate indexes are created on relevant fields (e.g., the field used for LevelDB keys) to optimize read and write performance.","message":"Performance characteristics of `mongodb-level` are ultimately tied to the underlying MongoDB performance. Neglecting proper MongoDB indexing or schema design can lead to slow queries, even when using the `abstract-level` API.","severity":"gotcha","affected_versions":">=0.0.1"},{"fix":"Always ensure `db.close()` is called in a `finally` block or similar cleanup mechanism, especially in applications that handle database connections explicitly.","message":"The `db.open()` and `db.close()` methods should be called to manage the database connection lifecycle. Failing to close the database can leave open connections, preventing your Node.js process from exiting gracefully.","severity":"gotcha","affected_versions":">=0.0.1"}],"env_vars":null,"last_verified":"2026-04-22T00:00:00.000Z","next_check":"2026-07-21T00:00:00.000Z","problems":[{"fix":"Verify your MongoDB server is running and accessible. Check the `MONGODB_URI` connection string for correct host, port, and credentials. Ensure no firewall is blocking the connection.","cause":"The MongoDB server is not running or is inaccessible from the application's host and port.","error":"MongooseServerSelectionError: connect ECONNREFUSED <your-mongodb-host>:<port>"},{"fix":"This is expected behavior for `abstract-level` when a key is not found. Catch the error using a `try...catch` block and check `error.code === 'LEVEL_NOT_FOUND'` to handle it gracefully.","cause":"An attempt was made to retrieve a key that does not exist in the database.","error":"NotFoundError: Key 'someKey' not found"},{"fix":"Ensure you are using `import { MongoDBLevel } from 'mongodb-level';` and that your project is configured for ES Modules (e.g., by adding `\"type\": \"module\"` to your `package.json` or using `.mjs` file extension).","cause":"Attempting to instantiate `MongoDBLevel` after using a CommonJS `require()` statement instead of an ESM `import` statement for a module that is ESM-only or transpiled.","error":"TypeError: MongoDBLevel is not a constructor"}],"ecosystem":"npm"}