Is it possible to use Javascript to query the neo4j database?

After creating a geohash neo4j database for NYC Taxi data, the next step is to visualize it on a map. I decided to use Leaflet as a JavaScript library. Using static data, I was able to plot geohash data in Leaflet:

https://i.sstatic.net/AtQKZ.jpg

Now, my goal is to query the data from the neo4j database and render it. Is it possible to achieve this with client-side scripting alone, or do I need a server-side language like Node.js or PHP?

Update

I came across a similar question here. The suggested solution involves querying the database with AJAX. However, when I tried this approach, I encountered an "error" message in the console:

var body = JSON.stringify({
            statements: [{
                statement: 'MATCH (n) RETURN count(n)'
            }]
        });
   $.ajax({
        url: "http://localhost:7474",
        type: "POST",
        data: body,
        contentType: "application/json"
    })
        .done(function(result){
            console.log(result);
        })
        .fail(function(error){
            console.log(error.statusText);
        });

Answer №1

If you want to interact with Neo4j using client-side Javascript, you can achieve this by leveraging the Neo4j Driver for JavaScript.

I've successfully integrated this driver into several projects.

To get started, you have the option to either download the driver and add it to your HTML file:

 <script src="lib/browser/neo4j-web.min.js"></script>

Alternatively, you can simply use the CDN link:

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7d33383e2634293b25243522453934462c6d202d21">[email protected]</a>/lib/browser/neo4j-web.min.js"></script>

Answer №2

After some troubleshooting, I have found the solution:

Initially, I discovered that the correct database URL is: "http://localhost:7474/db/data/transaction/commit" and not just "http://localhost:7474".

Upon fixing the URL issue, I encountered an unauthorized error in the console, indicating that my Ajax call required user credentials to access the database. To include these credentials, a beforeSend function needed to be added as shown below:

beforeSend: function (xhr) {
                xhr.setRequestHeader ("Authorization", "Basic " + btoa("neo4j"+ ":" + "your_neo4j_password"));
            }}

The final Ajax solution involves:

$.ajax({
            url: "http://localhost:7474/db/data/transaction/commit",
            type: "POST",
            data: body,
            contentType: "application/json",
            beforeSend: function (xhr) {
                xhr.setRequestHeader ("Authorization", "Basic " + btoa("neo4j" + ":" + "password"));
            }}
            )
            .done(function(result){
                 console.log(result);
            }) 
            .fail(function(error){
                console.log(error.statusText);
            });

Answer №3

It appears that Rajendra Kadam has provided the correct answer.

To begin, you will need to download and install the neo4j-driver package by running the command:

npm install neo4j-driver

Ensure that you install it in a directory located one level above the web/ directory of your node.js server.

Next, move the neo4j-web.min.js file into the web/ directory so that your client-side JavaScript can access it.

Include the following line in your HTML file:

<script src="js/neo4j-web.min.js"></script>

The neo4j-web.min.js file can be found in the

node_modules/neo4j-driver/lib/browser/
directory.

In your client-side JavaScript code, add the following lines:

var driver = neo4j.driver(
    'neo4j://localhost',
    neo4j.auth.basic('neo4j', 'password') );

Once you have successfully initialized the driver, make sure to input the correct password to avoid any authentication errors.

Remember, there is no need to include this particular line in your client-side JavaScript code:

var neo4j = require('neo4j-driver');

This code snippet is intended for server-side implementation with node.js.

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