Neo4j with the JavaScript driver

Uses neo4j-driver 6.3. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

neo4j://neo4j.example.com:7687
neo4j://machnosql.example.com:7687

The address comes from the environment variable NEO4J_URI, so switching to MachNoSQL changes configuration only.

Run

export NEO4J_URI='neo4j://machnosql.example.com:7687'
npm install
npm start

Credentials come from NEO4J_USERNAME and NEO4J_PASSWORD.

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

app.js

// Friends of friends on Neo4j, unchanged on MachNoSQL.
import neo4j from "neo4j-driver";

const driver = neo4j.driver(
  process.env.NEO4J_URI,
  neo4j.auth.basic(process.env.NEO4J_USERNAME, process.env.NEO4J_PASSWORD),
);
await driver.verifyConnectivity();

await driver.executeQuery(
  "UNWIND $pairs AS pair MERGE (a:Person {name: pair[0]}) MERGE (b:Person {name: pair[1]}) MERGE (a)-[:KNOWS]->(b)",
  { pairs: [["ada", "grace"], ["grace", "linus"], ["grace", "margaret"], ["linus", "ken"]] },
);
const { records } = await driver.executeQuery(
  "MATCH (p:Person {name: $name})-[:KNOWS]->()-[:KNOWS]->(fof) WHERE fof <> p RETURN DISTINCT fof.name AS name ORDER BY name",
  { name: "ada" },
);
console.log(records.map((record) => record.get("name")));

await driver.close();

package.json

{
  "name": "machnosql-example-neo4j-node",
  "private": true,
  "type": "module",
  "scripts": { "start": "node app.js" },
  "dependencies": { "neo4j-driver": "^6.3.0" }
}