Neo4j Driver as an Express Middleware

index.js

// Create an express app
const express = require('express');
const app = express();

// Tell it to use Neo4j middleware
app.use(require('./neo4j'));

// Example Route
app.get('/', (req, res) => {
    // Create Driver session
    const session = req.driver.session();
  
    // Run Cypher query
    const cypher = 'MATCH (n) RETURN count(n) as count';

    session.run(cypher)
        .then(result => {
            // On result, get count from first record
            const count = result.records[0].get('count');

            // Send response
            res.send({count: count.toNumber()});
        })
        .catch(e => {
            // Output the error
            res.status(500).send(e);
        })
        .then(() => {
            // Close the session
            return session.close();
        });
});

// Listen on port 8080
app.listen(8080, () => console.log('Listening on :8080'));

neo4j.js

// Require Neo4j
const neo4j = require('neo4j-driver').v1;

// Create Driver
const driver = new neo4j.driver("bolt://localhost:7687", neo4j.auth.basic("neo4j", "neo"));

// Express middleware
module.exports = function(req, res, next) {
    req.driver = driver;

    next();
};