langchain-mongodb

What it is and what it does

langchain-mongodb is a LangChain integration that wraps MongoDB Atlas Vector Search, allowing you to use MongoDB as a vector store for semantic search and retrieval-augmented generation (RAG) applications. It depends on langchain, langchain-core, pymongo, and several text-processing libraries to handle embeddings, document storage, and similarity queries.

The package provides a MongoDBAtlasVectorSearch class that connects to a MongoDB Atlas cluster, stores vector embeddings in a collection, and retrieves documents by semantic similarity. You supply connection credentials, a database and collection name, a vector search index name, and an embedding model, then call methods like similarity_search() to find relevant documents. It is designed for workflows where you want to leverage MongoDB's native vector capabilities within a LangChain application.

Use it for:

• Build a RAG chatbot that retrieves context from MongoDB before generating answers with an LLM.
• Implement semantic search over a large document corpus stored in MongoDB Atlas.
• Integrate vector embeddings into an existing MongoDB-backed application without switching databases.
• Prototype AI applications that combine LangChain orchestration with MongoDB vector storage.
• Store and query embeddings from multiple embedding models in a single MongoDB collection.

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

Connects MongoDB Atlas Vector Search to LangChain for semantic search and retrieval-augmented generation workflows using vector embeddings stored in MongoDB.

Yes, if you are already committed to MongoDB Atlas and LangChain for a RAG or semantic search application. The package has low install friction and no known vulnerabilities. However, the aging maintenance status (211 days since last release) and unclear license warrant verification before production use. Confirm license terms and compatibility with your LangChain version before deploying.

Install

langchain-mongodb on PyPI

pip install langchain-mongodb

uv add langchain-mongodb

poetry add langchain-mongodb

Installing langchain-mongodb

Before you install

Low install friction with a pure-wheel distribution. Maintenance status is aging—last release was 211 days ago—so expect slower response to issues, though the package remains functional for current LangChain versions.

License in practice

License treatment is unclear; no SPDX identifier or raw license text is available in the package metadata. Verify the actual license terms before use in proprietary or restricted contexts.

Quickstart

pip install -U langchain-mongodb

from langchain_mongodb import MongoDBAtlasVectorSearch
import os

vectorstore = MongoDBAtlasVectorSearch.from_connection_string(
    connection_string=os.environ["MONGODB_CONNECTION_STRING"],
    namespace="langchain_db.test",
    embedding=embedding_model,
    index_name="index_name",
)

docs = vectorstore.similarity_search("query text")

Requires Python >= 3.10, a MongoDB Atlas cluster with a vector search index already configured, and credentials for both MongoDB and an embedding provider.

Verify before relying

• Whether the package is actively maintained or in maintenance-only mode despite the 'aging' status.
• Actual license under which the package is distributed (SPDX or raw text not provided).
• Compatibility guarantees with future LangChain major versions given the aging maintenance signal.
• Whether external embedding providers (e.g., OpenAI) are required or if embeddings can be sourced elsewhere.

Package facts

Evidence: langchain_mongodb-0.11.0-py3-none-any.whl

Tags

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