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https://github.com/neo4j/neo4j

Graphs for Everyone
https://github.com/neo4j/neo4j

cypher database graph graph-database graphdb neo4j nosql

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Graphs for Everyone

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= Neo4j: Graphs for Everyone =



https://neo4j.com[Neo4j] is the world's leading Graph Database. It is a high performance graph store with all the features expected of a mature and robust database, like a friendly query language and ACID transactions. The programmer works with a flexible network structure of nodes and relationships rather than static tables -- yet enjoys all the benefits of enterprise-quality database. For many applications, Neo4j offers orders of magnitude performance benefits compared to relational DBs.



Learn more on the https://neo4j.com[Neo4j website].



https://discord.gg/neo4j[image:https://img.shields.io/discord/787399249741479977?label=Chat&logo=discord&style=for-the-badge[Discord]]



https://community.neo4j.com[image:https://img.shields.io/discourse/users?label=Forums&logo=discourse&server=https%3A%2F%2Fcommunity.neo4j.com&style=for-the-badge[Discourse users]]



== Using Neo4j ==



Neo4j is available both as a standalone server, or an embeddable component. You can https://neo4j.com/download/[download] or https://neo4j.com/sandbox/[try online].



== Extending Neo4j ==



We encourage experimentation with Neo4j. You can build extensions to Neo4j, develop library or drivers atop the product, or make contributions directly to the product core. You'll need to sign a Contributor License Agreement in order for us to accept your patches.



== Dependencies ==



Neo4j is built using https://maven.apache.org/[Apache Maven] version 3.8.2 and a recent version of supported VM. Bash and Make are also required. Note that maven needs more memory than the standard configuration, this can be achieved with `export MAVEN_OPTS="-Xmx2048m"`.



macOS users need to have https://brew.sh/[Homebrew] installed.



=== With brew on macOS ===



  brew install maven



Please note that we do not support building Debian packages on macOS.



=== With apt-get on Ubuntu ===



  sudo apt install maven openjdk-17-jdk



Be sure that the `JAVA_HOME` environment variable points to `/usr/lib/jvm/java-17-openjdk-amd64`

(you may have various java versions installed).



== Building Neo4j ==



Before you start running the unit and integration tests in the Neo4j Maven project on a Linux-like system, you should ensure your limit on open files is set to a reasonable value. You can test it with `ulimit -n`. We recommend you have a limit of at least 40K.



* A plain `mvn clean install -T1C` will only build the individual jar files.

* Test execution is, of course, part of the build.

* In case you just want the jars, without running tests, this is for you: `mvn clean install -DskipTests -T1C`.

* You may need to increase the memory available to Maven: `export MAVEN_OPTS="-Xmx2048m"` (try this first if you get build errors).

* You may run into problems resolving `org.neo4j.build:build-resources` due to a bug in maven. To resolve this simply invoke `mvn clean install -pl build-resources`.



== Running Neo4j ==



After running a `mvn clean install`, `cd` into `packaging/standalone/target` and extract the version you want, then:



  bin/neo4j-admin server start



in the extracted folder to start Neo4j on `localhost:7474`. On Windows you want to run:



  bin\neo4j-admin server start



instead.



== Neo4j Desktop ==



Neo4j Desktop is a convenient way for developers to work with local Neo4j databases.



To install Neo4j Desktop, go to https://neo4j.com/download-center/[Neo4j Download Center] and follow the instructions. 



== Licensing ==



Neo4j Community Edition is an open source product licensed under GPLv3.



Neo4j Enterprise Edition includes additional closed-source components _not available in this repository_ and requires a commercial license from Neo4j or one of its affiliates.



== Trademark ==



Neo4j's trademark policy is available at https://neo4j.com/trademark-policy/[our trademark policy page].