Issun Db

IssunDB

[](https://github.com/IssunDB/issun-db/actions/workflows/tests.yml) [](https://codecov.io/gh/IssunDB/issun-db) [](https://crates.io/crates/issundb) [](https://docs.rs/issundb) [](https://issundb.github.io/issun-db/) [](https://github.com/IssunDB/issun-db)

An embedded graph database for AI applications and graph analytics

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IssunDB is an embedded graph database written in Rust. It can be embedded in Rust applications without a separate server, and is designed for applications such as GraphRAG pipelines and knowledge graphs.

You can download the latest binaries (for IssunDB CLI, MCP and HTTP servers) from here.

Key Features

• ACID transactions, property graph model, and Cypher query support
• Graph traversal and analytics using sparse matrix operations
• Vectorized query execution with multi-core parallel processing
• Vector, full-text, and hybrid search
• APIs for Rust, Python, CLI, HTTP REST, and MCP
• Support for Linux, macOS, and Windows

> [!IMPORTANT] > This project is still in early development, so bugs and breaking changes are expected. > Please use the issue page to report bugs or request features.

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Quickstart

To use IssunDB in your Rust project, add the dependency to your Cargo.toml:

[dependencies]
issundb = "0.1.0-alpha.14"
serde_json = "1.0"

> [!NOTE] > IssunDB needs Rust 1.85.0 or newer.

The following example opens a database, inserts nodes, creates relationships, and queries the graph using Cypher:

use std::path::Path;
use issundb::{Graph, GraphQueryExt};

fn main() -> Result> {
    // Open a graph database (with a 1 GB memory map size limit)
    let graph = Graph::open(Path::new("./issundb-data"), 1)?;

    // Add two nodes with properties
    let alice_props = serde_json::json!({ "name": "Alice", "age": 30 });
    let alice_id = graph.add_node("Person", &alice_props)?;

    let bob_props = serde_json::json!({ "name": "Bob", "age": 28 });
    let bob_id = graph.add_node("Person", &bob_props)?;

    // Add an edge between the nodes
    let edge_props = serde_json::json!({ "since": 2021 });
    graph.add_edge(alice_id, bob_id, "KNOWS", &edge_props)?;

    // Optional: rebuild CSR snapshot manually after bulk writes
    graph.rebuild_csr()?;

    // Run a Cypher query and print the results
    let result = graph.query(
        "MATCH (a:Person)-[r:KNOWS]->(b:Person) RETURN a.name, b.name, r.since"
    )?;

    for record in result.records {
        println!(
            "Match: {} knows {} since {}",
            record.values[0],
            record.values[1],
            record.values[2]
        );
    }

    Ok(())
}

# Output:
Match: "Alice" knows "Bob" since 2021

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Running IssunDB in a Container

CLI

# Run IssunDB with the CLI
docker run --rm -it -v issundb-data:/data ghcr.io/issundb/issundb:latest

HTTP (REST)

# Run IssunDB with the HTTP API on port 7474
docker run --rm -p 7474:7474 -v issundb-data:/data ghcr.io/issundb/issundb:latest issundb-rest

MCP

# Run IssunDB with the MCP API on port 8000
docker run --rm -p 8000:8000 -v issundb-data:/data ghcr.io/issundb/issundb:latest issundb-mcp

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Documentation

The project documentation is available here. The Rust API documentation is available on docs.rs/issundb.

Rust Examples

Refer to the [issundb-examples](crates/issundb-examples) crate for Rust API examples.

Python Examples

Refer to the [issundb-py/examples](crates/issundb-py/examples) directory for Python API examples.

Knowlege Graph Demo

[](https://asciinema.org/a/L1iTAtQeVeCe6jiX)

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Contributing

See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to make a contribution.

License

IssunDB is available under either of these licenses:

• MIT License ([LICENSE-MIT](LICENSE-MIT))
• Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE))

Acknowledgements

• The logo is from SVG Repo with some modifications.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: IssunDB
• Source: IssunDB/issun-db
• License: Apache-2.0
• Homepage: https://issundb.github.io/issun-db/

Install and usage instructions live in the source repository linked above.