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JanusGraph
An open-source distributed property graph database forked from the Titan codebase. Supports pluggable storage backends (Cassandra, HBase, BerkeleyDB) with ACID transactions and native TinkerPop integration.
- First released
- April 2017
- License
- Apache-2.0
- Built with
- Java
Details
- Vendor
- The Linux Foundation
- Type
- Property Graph
- Category
- Established
- License
- Apache-2.0
- Language
- Java
- Query Languages
- Gremlin
- Protocols
- Gremlin (WebSocket)Gremlin (HTTP)
Feature scores
Community & Business
Active development ✓
Updated within last 3 months Commercial support No commercial support Live community ✓
>75% of issues addressed Open Source ✓
Open source license Pricing ✓
Pricing publicly available Trendiness No description available Deployment
Containerization ✓
Docker image available Work as dedicated instance ✓
Can run as standalone server Work as embedded ✓
Can embed in application Testing in-memory version ✓
In-memory mode available Platform
Operating on Linux ✓
Linux officially supported Operating on Windows ✓
Windows officially supported SaaS offering ✓
Cloud service available Operations
Automatic updates Manual updates only Client side caching No client-side caching Data versioning support No versioning Live backups ✓
Hot backup supported Distribution
Cluster Re-balancing No auto-rebalancing Data Distribution ✓
Data sharding supported High-Availability ✓
HA mechanisms available Query Distribution No distributed queries Replication support ✓
Replication available Developer Experience
Data types defined ✓
Composite data types Logging/Auditing ✓
Event logging supported Object-Graph Mapper No object mapper Reactive programming No reactive programming Documentation up-to-date No description available Binary protocol ✓
Binary protocol available CLI ✓
Command-line interface Data Model
Multi-database ✓
Multi-model database Graph-native data ✓
Native graph storage REST API ✓
REST endpoint available Query Language ✓
Standard query language (Cypher/Gremlin) Transactions
Granular locking No description available Multiple isolation levels Single isolation level Read committed transaction No description available Transaction support ✓
ACID transactions Schema & Security
Constraints ✓
Full constraint support Schema support ✓
Schema definition tools Secondary indexes ✓
Secondary indexes supported Server side procedures No stored procedures Triggers No description available Authentication ✓
Authentication supported Authorization ✓
Role-based access control Data encryption No encryption
Sources
5 references
Protocols Gremlin (WebSocket), Gremlin (HTTP)
JanusGraph Server wraps Gremlin Server; default channelizer is WebSocket, HttpChannelizer or WsAndHttpChannelizer enable HTTP access on the same port 8182.
-
This section will describe how to use the WebSocket configuration, as well as describe how to configure JanusGraph Server to handle HTTP endpoint interactions.
JanusGraph Server - JanusGraph · reviewed 2026-08-02
License Apache-2.0
Confirms the current value.
-
All functionality is totally free. No need to buy commercial licenses. JanusGraph is fully Open Source under the Apache 2 license.
JanusGraph · reviewed 2026-08-02
Released 2017-04
Confirms the current value. The project was announced under the Linux Foundation in January 2017 as a fork of Titan, but its first tagged release (0.1.0) shipped in April 2017.
-
Version 0.1.0 (Release Date: April 11, 2017)
Changelog · reviewed 2026-08-02 -
JanusGraph is a fork of the popular open source project Titan, originally released in 2012 by Aurelius, and subsequently acquired by DataStax.
JanusGraph connects the past and future of Titan · reviewed 2026-08-02
Language Java
JanusGraph's docs/README describe it only in general terms without stating 'Java' in prose; the project's pom.xml (Maven build, maven-compiler-plugin config) is direct, unambiguous evidence it's a Java codebase.
-
<artifactId>maven-compiler-plugin</artifactId>
<version>3.13.0</version>
<configuration>
<source>${compiler.source}</source>
<target>${compiler.target}</target>
<compilerArgs>
<arg>-Xmaxerrs</arg>
<arg>500</arg>
<arg>-Xlint:unchecked</arg>
</compilerArgs>
</configuration>
</plugin>
pom.xml - JanusGraph/janusgraph · reviewed 2026-08-02