DocumentDB

Free#12 of 28 in Document Databases

Open-source MongoDB-compatible document database built on PostgreSQL

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At a glance

Editor score
Not yet scored
Pricing
Open source
Best for
Open-source PostgreSQL and MongoDB-compatible stacks
Paid from
None
Facts checked
22 Sep 2026

Where it wins
- Native BSON storage with PostgreSQL SQL compatibility
- MongoDB wire-protocol compatibility and driver support
- Vector, text, geospatial, and compound indexing options
Where it doesn't
- Deployment centers on Linux, Docker, and Kubernetes
- PostgreSQL extension knowledge is useful for administration
- Operational responsibility remains with the deployment team

Our verdict on DocumentDB

DocumentDB is an open-source document database implemented on PostgreSQL. It stores native BSON documents, supports JSON, and provides MongoDB wire-protocol compatibility alongside document CRUD and management APIs. Its intended audience includes teams building modern web applications, AI and machine-learning workloads, hybrid document-relational systems, or MongoDB migration projects. Transactions and PostgreSQL SQL compatibility make it relevant when document data needs to work alongside relational operations.

The platform fits teams that already work with PostgreSQL, MongoDB tooling, or containerized infrastructure. MongoDB drivers and tools can connect through the compatibility layer, while Docker supports a local runtime and a Kubernetes operator supports hybrid and multi-cloud deployments. Integrations with PostgreSQL, pgvector, Visual Studio Code, Docker, and Kubernetes reinforce that ecosystem fit. Linux packages are also part of the deployment model, so the product suits organizations prepared to manage their own database environments.

DocumentDB covers a broad indexing and search range: single-field, multi-key, compound, text, geospatial, and vector indexes are supported. Vector similarity search uses HNSW and IVFFlat indexes, giving AI-oriented workloads a path to combine document storage with vector retrieval. SCRAM authentication and TLS support address core connection security needs. The trade-off is operational convenience: the stated options emphasize self-hosted and Kubernetes-based deployment rather than a managed database experience. Choose DocumentDB when PostgreSQL foundations, MongoDB compatibility, open-source control, and advanced indexing matter. Consider an alternative if a fully managed service is the primary requirement.

DocumentDB pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on documentdb.io

DocumentDB fact sheet

Free plan	Not verified
Paid from	None
Deployment model	Both
Managed cloud	Not verified
Document formats	BSON, JSON
Transactions	Yes
Vector search	Yes
Maximum document size	Not verified
Deployment	Cloud, Self-hosted
Platforms	Linux
Support	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations	5 integrations: MongoDB-compatible drivers, mongosh, PyMongo, MongoDB Node.js driver, Visual Studio Code
Pricing	Open source
Website	documentdb.io
Facts checked	22 Sep 2026

DocumentDB integrations

DocumentDB lists 5 integrations on its own site.

MongoDB-compatible drivers
mongosh
PyMongo
MongoDB Node.js driver
Visual Studio Code

Alternatives to DocumentDB

See all DocumentDB alternatives →

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Guides on document databases

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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