Graph Database Platform | Graph Database Management System

Introducing

Neo4j Aura Enterprise

Neo4j's fully managed cloud service – the zero-admin, always-on graph database – now for the global enterprise

Learn More
Just Released!

Graph Databases For Dummies

Learn the basics of graph databases — from data modeling to deploying your first application

Download Free
Free Offer

Graph Algorithms

New Data Science Code and Content

Download eBook

See Our Customers

Why Neo4j?

Learn the basics in about a minute

Free O'Reilly Ebook
Graph Algorithms: Examples in Spark and Neo4j

Sample code and tips for over 20 practical algorithms. Find vulnerabilities, detect communities, improve machine learning.

Read Now

No Download Required
Get Started Quickly with the Neo4j Sandbox

Start using Neo4j in seconds, with built-in guides and datasets for popular use cases. No experience necessary.

Try It Now

Neo4j Special Edition
Graph Data Science
for Dummies

GDS for Dummies walks you through the foundations of graph data science, from defining algorithms to machine learning.

Download Now

What is Neo4j?

Neo4j is a native graph database, built from the ground up to leverage not only data but also data relationships. Neo4j connects data as it’s stored, enabling queries never before imagined, at speeds never thought possible.

The Native Graph Advantage

Unlike traditional databases, which arrange data in rows, columns and tables, Neo4j has a flexible structure defined by stored relationships between data records.

With Neo4j, each data record, or node, stores direct pointers to all the nodes it’s connected to. Because Neo4j is designed around this simple, yet powerful optimization, it performs queries with complex connections orders of magnitude faster, and with more depth, than other databases.

Learn More

Cypher — The Graph Query Language

With Neo4j, connections between data are stored – not computed at query time. Cypher is a powerful, graph-optimized query language that understands, and takes advantage of, these stored connections.

When trying to find patterns or insights within data, Cypher queries are often much simpler and easier to write than massive SQL JOINs. Since Neo4j doesn’t have tables, there are no JOINs to worry about. For comparison with SQL, here's a simple Cypher query matching all products in a category hierarchy:

Cypher

      MATCH (p:Product)-[:CATEGORY]->(l:ProductCategory)-[:PARENT*0..]->(:ProductCategory {name:"Dairy Products"})
RETURN p.name
    

Here's a similar query in SQL, which is longer and more complex. Unlike Cypher, where depth is unlimited, this SQL query selects just three levels of depth.

SQL

      SELECT p.ProductName
FROM Product AS p
JOIN ProductCategory pc ON (p.CategoryID = pc.CategoryID AND pc.CategoryName = "Dairy Products")

JOIN ProductCategory pc1 ON (p.CategoryID = pc1.CategoryID)
JOIN ProductCategory pc2 ON (pc1.ParentID = pc2.CategoryID AND pc2.CategoryName = "Dairy Products")

JOIN ProductCategory pc3 ON (p.CategoryID = pc3.CategoryID)
JOIN ProductCategory pc4 ON (pc3.ParentID = pc4.CategoryID)
JOIN ProductCategory pc5 ON (pc4.ParentID = pc5.CategoryID AND pc5.CategoryName = "Dairy Products")
;
    

Learn More

Use Your Favorite Programming Language

Neo4j officially supports drivers for .Net, Java, JavaScript, Go and Python. Our community contributors provide many more, including PHP, Ruby, R, Erlang, Clojure and C/C++.

Learn More

        // npm install --save neo4j-driver
// node example.js
const neo4j = require('neo4j-driver');
const driver = neo4j.driver('bolt://<HOST>:<BOLTPORT>',
                  neo4j.auth.basic('<USERNAME>', '<PASSWORD>'), 
                  {/* encrypted: 'ENCRYPTION_OFF' */});

const query =
  `
  MATCH (p:Product)-[:PART_OF]->(:Category)-[:PARENT*0..]->
  (:Category {categoryName:$category})
  RETURN p.productName as product
  `;

const params = {"category": "Dairy Products"};

const session = driver.session({database:"neo4j"});

session.run(query, params)
  .then((result) => {
    result.records.forEach((record) => {
        console.log(record.get('product'));
    });
    session.close();
    driver.close();
  })
  .catch((error) => {
    console.error(error);
  });

      

        # pip3 install neo4j-driver
# python3 example.py

from neo4j import GraphDatabase, basic_auth

driver = GraphDatabase.driver(
  "bolt://<HOST>:<BOLTPORT>", 
  auth=basic_auth("<USERNAME>", "<PASSWORD>"))

cypher_query = '''
MATCH (p:Product)-[:PART_OF]->(:Category)-[:PARENT*0..]->
(:Category {categoryName:$category})
RETURN p.productName as product
'''

with driver.session(database="neo4j") as session:
  results = session.read_transaction(
    lambda tx: tx.run(cypher_query,
      category="Dairy Products").data())

  for record in results:
    print(record['product'])

driver.close()
      

        // go mod init main
// go run example.go
package main
import (
	"fmt"
	"github.com/neo4j/neo4j-go-driver/neo4j" //Go 1.8
)
func main() {
	s, err := runQuery("bolt://<HOST>:<BOLTPORT>", "<USERNAME>", "<PASSWORD>")
	if err != nil {
		panic(err)
	}
	fmt.Println(s)
}
func runQuery(uri, username, password string) ([]string, error) {
	configForNeo4j4 := func(conf *neo4j.Config) { conf.Encrypted = false }
	driver, err := neo4j.NewDriver(uri, neo4j.BasicAuth(username, password, ""), configForNeo4j4)
	if err != nil {
		return nil, err
	}
	defer driver.Close()
	sessionConfig := neo4j.SessionConfig{AccessMode: neo4j.AccessModeRead, DatabaseName: "neo4j"}
	session, err := driver.NewSession(sessionConfig)
	if err != nil {
		return nil, err
	}
	defer session.Close()
	results, err := session.ReadTransaction(func(transaction neo4j.Transaction) (interface{}, error) {
		result, err := transaction.Run(
			`
			MATCH (p:Product)-[:PART_OF]->(:Category)-[:PARENT*0..]->
			(:Category {categoryName:$category})
			RETURN p.productName as product
			`, map[string]interface{}{
				"category": "Dairy Products",
			})
		if err != nil {
			return nil, err
		}
		var arr []string
		for result.Next() {
			value, found := result.Record().Get("product")
			if found {
			  arr = append(arr, value.(string))
			}
		}
		if err = result.Err(); err != nil {
			return nil, err
		}
		return arr, nil
	})
	if err != nil {
		return nil, err
	}
	return results.([]string), err
}
      

        // install dotnet core on your system
// dotnet new console -o .
// dotnet add package Neo4j.Driver
// paste in this code into Program.cs
// dotnet run

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Neo4j.Driver;
  
namespace dotnet {
  class Example {
  static async Task Main() {
    var driver = GraphDatabase.Driver("bolt://<HOST>:<BOLTPORT>", 
                    AuthTokens.Basic("<USERNAME>", "<PASSWORD>"));

    var cypherQuery =
      @"
      MATCH (p:Product)-[:PART_OF]->(:Category)-[:PARENT*0..]->
      (:Category {categoryName:$category})
      RETURN p.productName as product
      ";

    var session = driver.AsyncSession(o => o.WithDatabase("neo4j"));
    var result = await session.ReadTransactionAsync(async tx => {
      var r = await tx.RunAsync(cypherQuery, 
              new { category="Dairy Products"});
      return await r.ToListAsync();
    });

    await session?.CloseAsync();
    foreach (var row in result)
      Console.WriteLine(row["product"].As<string>());
	  
    }
  }
}
      

        // Add your the driver dependency to your pom.xml build.gradle etc.
// Java Driver Dependency: http://search.maven.org/#artifactdetails|org.neo4j.driver|neo4j-java-driver|4.0.1|jar
// Reactive Streams http://search.maven.org/#artifactdetails|org.reactivestreams|reactive-streams|1.0.3|jar
// download jars into current directory
// java -cp "*" Example.java

import org.neo4j.driver.*;
import static org.neo4j.driver.Values.parameters;

public class Example {

  public static void main(String...args) {

    Driver driver = GraphDatabase.driver("bolt://<HOST>:<BOLTPORT>",
              AuthTokens.basic("<USERNAME>","<PASSWORD>"));

    try (Session session = driver.session(SessionConfig.forDatabase("neo4j"))) {

      String cypherQuery =
        "MATCH (p:Product)-[:PART_OF]->(:Category)-[:PARENT*0..]->" +
        "(:Category {categoryName:$category})" +
        "RETURN p.productName as product";

      var result = session.readTransaction(
        tx -> tx.run(cypherQuery, 
                parameters("category","Dairy Products"))
            .list());

      for (Record record : result) {
        System.out.println(record.get("product").asString());
      }
    }
    driver.close();
  }
}



      

Learn More

Neo4j - The Fastest Path To Graph Success

Neo4j for RDBMS Developers

Get an introduction to Neo4j with The Definitive Guide to Graph Databases for the RDBMS Developer.

Get the Guide

Bottom-line Impact

Learn how companies are using graph databases to gain sustainable competitive advantage.

Get the White Paper

Graph Expertise

Tap into an ecosystem of solutions and graph-based services to shorten your learning curve.

Professional Services

Neo4j Blog
Happy Global Graph Celebration Day 2021!

This is the third year we're celebrating Global Graph Celebration Day, in honor of the birthday of Swiss mathematician and inventor of graph theory, Leonhard Euler. And just like in years past, we've got a few ways for all of you graph enthusiasts to celebrate! In a recent article in The Irish Times, ...

Neo4j Blog
Happy One-Year Anniversary to Neo4j Graph Data Science!

Happy anniversary, Neo4j Graph Data Science! Has it really been a year already?! We announced the Neo4j’s Graph Data Science (GDS) framework back in April 2020, and we’ve come a long way since! To Catch You Up Neo4j GDS is the first enterprise graph framework for data scientists and ...

Neo4j Blog
Graphs for Real-Time Transaction Processing: 5-Minute Interview with Jorge Zaccaro

“Once we noticed that we were modeling transactions as a graph, we went out to look for a native graph database and we found that Neo4j was a great fit for this use case,” said Jorge Zaccaro, Software Engineer at Minka. How does Neo4j help you solve that problem? We describe our use case as ...

Neo4j Aura Enterprise

Neo4j's fully managed cloud service – the zero-admin, always-on graph database – now for the global enterprise

Graph Databases For Dummies

Learn the basics of graph databases — from data modeling to deploying your first application

Graph Algorithms

New Data Science Code and Content

Why Neo4j?

Free O'Reilly Ebook Graph Algorithms: Examples in Spark and Neo4j

No Download Required Get Started Quickly with the Neo4j Sandbox

Neo4j Special Edition Graph Data Sciencefor Dummies

What is Neo4j?

The Native Graph Advantage

Cypher — The Graph Query Language

Cypher

SQL

Use Your Favorite Programming Language

Neo4j for RDBMS Developers

Bottom-line Impact

Graph Expertise

Neo4j Blog Happy Global Graph Celebration Day 2021!

Neo4j Blog Happy One-Year Anniversary to Neo4j Graph Data Science!

Neo4j Blog Graphs for Real-Time Transaction Processing: 5-Minute Interview with Jorge Zaccaro

Free O'Reilly Ebook
Graph Algorithms: Examples in Spark and Neo4j

No Download Required
Get Started Quickly with the Neo4j Sandbox

Neo4j Special Edition
Graph Data Science
for Dummies

Neo4j Blog
Happy Global Graph Celebration Day 2021!

Neo4j Blog
Happy One-Year Anniversary to Neo4j Graph Data Science!

Neo4j Blog
Graphs for Real-Time Transaction Processing: 5-Minute Interview with Jorge Zaccaro